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NVIDIA nForce4 SLI Intel Edition

Considering the tremendous success and popularity of nForce4 SLI motherboards in the AMD world and NVIDIA’s November announcement of partnering with Intel, it’s no surprise to see the launch of the nForce4 SLI Intel Edition. Check out our look into the technology and preview of the performance.


For a long time, it looked like NVIDIA was only going to have AMD chipsets, but last November, NVIDIA and Intel announced a partnership that enabled NVIDIA to release a motherboard chipset that supports Intel processors. For Intel fans wanting the great performance of nForce, the wait is now over. So what is the name of this new chipset? It is the nForce4 SLI Intel Edition.

“Why not call it nForce5?” you ask. Well, NVIDIA feels that this set of platform processors (or chipset) are not different enough from the AMD version to warrant a new name. Once you start looking at the details, it’s easy to understand why NVIDIA made this decision. There are only several major differences in the AMD and Intel nForce4 platforms. One of these differences is the use of two chips, an MCP and an SPP (much like nForce2 and synonymous with a traditional northbridge and southbridge), for the Intel Edition instead of a single chip as seen on the nForce3 and nForce4 AMD boards. Unlike AMD Athlon 64 processors, Intel’s latest LGA775 Prescott processors do not feature an integrated memory controller. Hence, the need for a second platform processor, the SPP, with a memory controller.

Like the Intel 925XE chipset, the nForce4 SLI Intel Edition will support a 1066MHz front side bus (FSB) and dual channel DDR2. As you would expect, the socket is Intel’s latest, the LGA775. Additionally, the board supports NVIDIA’s RAID and ActiveArmor firewall. One of the biggest impacts of this announcement and launch is the availability of SLI to Intel users. Now, AMD and Intel fans can enjoy the highest gaming performance available.

A couple of other nForce improvements that NVIDIA is promoting with this launch are MediaShield and the new version of nTune. MediaShield basically refers to NVIDIA’s RAID storage solutions and its ease of use. Version 2.5 of nTune is aimed at making consumers’ lives a little easier by automating some system tweaking. I’ll go into more detail on all of this stuff in the following pages so be sure to read on to learn more about nForce4 SLI Intel Edition.

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Technical Specifications
NVIDIA nForce4 SLI Intel Edition


Frontside Bus: Pentium 4 CPU Interface

  • 2× address and 4× data
    • QDR (Quad Data Rate) support for 400 MT/s – 1066 MT/s (100MHz –266MHz FSB)
    • Theoretical maximum burst bandwidth of 8.5GB/s
  • Standard bus speeds up to 266MHz supported
  • 36-bit addressing for access to 64GB of memory space
  • Dynamic Bus Inversion
  • Frontside bus (FSB) pipeline depth of 12 in-order queue depth
  • Hyper-Threading Technology support

Dual Channel DDR2 128-Bit Memory Interface

  • Two independent 64-bit memory controllers
  • Can also operate in ganged mode (as one 128-bit controller)
  • Support for 400 MT/s (200MHz), 533 MT/s (266MHz), and 667 MT/s (333 MHz) for a theoretical maximum bandwidth of 10.6 GB/s
  • Up to eight internal banks per DDR2 chip
  • Up to two DIMMs per controller for a maximum of four DIMM support
    • Separate 64-bit data bus per controller
    • Separate address and control bus per DIMM
    • Up to 16 GB using four 4-GB DIMMs
  • Supports synchronous and pseudo-synchronous operation with FSB
  • Supports un-buffered non-ECC DIMMs
  • Low power suspend-to-RAM (S3) support
  • Active and pre-charge power down
  • Support for SPD (Serial Presence Detect) scheme for DIMM detection and configuration

Power Management

  • Internal clock generator
  • Support for Pentium 4 performance states
  • Support for HyperTransport link lower power disconnected state
  • PCI Express L0s and L1 active link power management support and L2/L3 low power state support
  • Full ACPI 2.0 and PCI PM 1.1 support, including C2/C3, Power on Suspend,
  • Suspend to RAM, Suspend to Disk, and Soft-Off CPU power state support.


Native Gigabit Ethernet technology

  • The fastest Gigabit Ethernet solution in the market
  • Supports 10/100/1000Base-T Ethernet
    • RGMII or MII interface

Advanced networking features

  • TCP segmentation offloads
  • Jumbo frames
  • Checksum offloads
  • Interrupt moderation
  • Traffic prioritization
  • Remote wake-up
  • Network management for easy set up, configuration, and monitoring


NVIDIA ActiveArmor™ Secure Networking Engine

  • Dedicated hardware engine
  • Enhances network security
  • Reduces CPU overhead
  • Powers and accelerates ActiveArmor Firewall

ActiveArmor™ Firewall technology

  • Industry’s first true hardware-based firewall
  • Unmatched performance and protection
    • ‘instant-on’ and tamper resistant
  • Advanced management features through user friendly interface
    • Remote access, configuration, monitoring
    • Command line interface (CLI)
    • Intelligent application management


NVIDIA MediaShield™ Storage

  • RAID 5 faster disk access with fault tolerance and optimized capacity
  • RAID 0 disk striping support for highest system and application performance
  • RAID 1 disk mirroring support for fault tolerance
  • RAID 0+1 disk striping and mirroring support for highest performance with fault tolerance
  • NVIDIA Disk Alert System provides a visual indication so users know exactly which SATA hard drive to replace during an array failure
  • Converting allows users to change the current state of an array to another using one single step without reboot of the PC
  • Cross Controller RAID uniquely supports both SATA and PATA disk devices within a single array

Serial ATA

  • Support for SATAII 3Gb/s and SATA 1.5Gb/s disk controller standards
  • Supports full Tagged Command Queuing (TCQ) and Native Command Queuing (NCQ)

Dual controller architecture

  • Two separate and independent controllers. Results in up to twice the bandwidth to disks
  • Four (4) integrated SATA 3Gb/s ports

Fast Ultra ATA-133 Disk Drive Controller

  • 5V-tolerant primary and secondary channels, with support for up to four devices
  • Supports Ultra-DMA modes 6-0, DMA modes 2-0, and PIO modes 4-0
  • Industry-standard PCI bus master IDE register set
  • Separate independent IDE connections for 5V-tolerant primary and secondary interfaces


PCI Express Interface – SLI™

  • PCI Express high-performance, scalable interconnect. Rapidly being adopted by the PC industry; designed to replace the AGP and PCI interconnects currently in use.
  • A x16 PCI Express link has 4 times the total bandwidth of today’s AGP 8X interface
  • x16 PCI Express link for high performance graphics cards featuring the latest Graphics Processors with DirectX 9.0 and Shader Model 3.0 support
  • Additional x1 PCI Express links for other add-in cards
  • Five independent PCI Express controllers with 20 total lanes that can be configured as follows:
    • One ×16 and four ×1 PCI Express lanes
    • Two ×8 and three ×1 PCI Express lanes (SLI Mode)
  • x16 controller can support isochronous data channel
  • Supports PME messages for power management
  • 2.5 GHz support for a theoretical maximum bandwidth of 2.5Gb/s per lane per direction

USB 2.0

  • USB 2.0 Enhanced Host Controller Interface (EHCI) / USB 1.1 Open Host Controller Interface (OHCI)
  • Support for up to 10 ports
  • Supports transfer rates at high speed (480Mbps), full speed (12Mbps), and low speed (1.2Mbps)
  • Dynamically configures slower devices for best utilization of bandwidth
  • Allows USB concurrency

PCI Interface

  • Includes an arbiter that supports six external master PCI slots.
  • Features of the PCI interface include:
    • PCI 2.3-compliant, 5 V tolerant
    • Supports six external PCI slots at 33MHz
    • Supports five bus master arbitration
    • PCI master and slave interfaces
    • Supports both master-initiated and slave-initiated terminations
    • Bidirectional write posting support for concurrency
    • Flexible routing of all four PCI interrupts
    • Supports read ahead: memory read line (MRL) and memory read multiple (MRM)


AC ’97 2.3 compliant interface

  • Supports 2, 4, 6, or 8-channel audio
  • Dual AC-Link – supports up to two codecs
  • Dual SPDIF – supports two simultaneous digital outputs; handles stereo PCM or AC-3 output
  • 16-bit or 20-bit stereo, 48kHz output and 16-bit input streams across AC-Link
  • 24-bit, 96kHz stereo output on the secondary SPDIF output
  • Supports input, output, and general purpose input/output channels for host-based modems
  • Separate independent functions for audio and modem

$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$


The nForce4 SLI Intel Edition utilizes two platform processors – the SPP (system platform processor) and the MCP (media and communications processor). The MCP is much like the single chip found on the AMD version of nForce4 Ultra/SLI boards. As I mentioned before, the common feature set shared by the AMD and now Intel nForce4 solution is what motivated NVIDIA to simply utilize the nForce4 name for this launch. The SPP is where NVIDIA really spent the most time and effort to optimize performance for the Intel nForce4. The SPP takes on the memory controller and PCI Express duties, as you can see in the diagram below. In between the MCP and SPP, we find the HyperTransport link.

NVIDIA nForce4 SLI Intel Edition Architecture Diagram

nForce4 SLI MCP

  • Support for 10 USB 2.0 ports
  • Support for 7.1 audio with S/PDIF
  • Support for 5 PCI slots
  • Support for 1 Gigabit Ethernet port
  • NVIDIA ActiveArmor
    • Full Gigabit Ethernet performance with NVIDIA Firewall protection
    • Dedicated hardware engine enhances networking security while reducing CPU overhead
    • Protects your PC from malicious spyware and hacker attacks
    • User-friendly interface offers advanced management features
    • Supports new Microsoft Longhorn TCP architecture
  • NVIDIA MediaShield Storage
    • Intelligent Disk Alert system simplifies troubleshooting
    • Dual-controller architecture delivers unmatched scalability and performance
    • Supports SATA 3Gb/s hard drives
    • Supports up to 4 SATA and 4 PATA drives simultaneously – RAID can span across SATA and PATA
    • Support for RAID 0, 1, 0+1, 5 & JBOD

nForce4 SLI SPP

  • Support for 1066MHz FSB and beyond
  • NVIDIA DualDDR2 architecture
    • High bandwidth, low latency interface for faster data access, up to 10.6GB/s memory bandwidth
    • 128-bit Dual Channel DDR2-667MHz, designed to operate in 128-bit mode independent of DIMM configuration
    • Dedicated address bus for each DIMM reduces memory latency and provides extensive overclockability
  • High-performance PCI Express design

You can see that the nForce4 SLI MCP and SPP combine to create a very capable and feature-rich chipset. A welcome addition to the MCP is support for RAID 5. Some of you might be wondering about the audio. NVIDIA went with the same 7.1 audio as on the AMD nForce4 Ultra/SLI. Apparently, the demand for high definition audio (i.e. Azalia) is low, so adding to the cost of the board for something not high in demand made little sense to NVIDIA. Additionally, many hardcore enthusiasts will opt to install a dedicated PCI sound card and just disable any onboard sound.

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With its MediaShield storage solution, NVIDIA is looking to bring sophisticated storage features and capabilities to the average consumer while still offering robust performance and options for enthusiasts. The focus right now seems to be consumerizing the concepts of RAID and backing up data. In a nutshell, MediaShield is all about RAID and making RAID solutions easier to use and manage.

You might be wondering why NVIDIA feels this is necessary. Well, the fact is that more and more consumers are storing music, photos, videos and other personal files on their computers. Most people realize how important these files are to them, but they may not realize how easily they can be lost. Imagine losing $200 worth of MP3s or four years worth of digital photos of your baby growing up. MediaShield’s goal is to allow the average consumer to take advantage of RAID, improved performance and data backups without ever having to understand any of the concepts. Can’t you just imagine your mom running RAID 5 and not even knowing she’s doing it!?

The most common RAID levels are RAID 0 (striping), RAID 1 (mirroring) and RAID 5 (striping with parity – see above image). I think it’s important to note that while many people will loosely talk about RAID 1, RAID 0+1 and RAID 5 as providing a backup of data, this isn’t the whole story. A separate and independent copy of important data, whether on tape, CD, disk or other media, is always preferable. Just imagine if you have a RAID 1 configuration, assuming that you are getting an “automatic backup” of your data all the time because of the mirroring that the controller is doing. While it is true that if one of your disks fails, your data is still safe because it is mirrored on the other disk in the RAID 1 array; it is also true that if you get a virus or suffer some sort of data corruption, this event will mirror across both disks. If files were destroyed, you really have no backup since the virus or corruption would have written to both disks. On the other hand, if you had a separate backup of the lost files, such as on a USB drive or external hard drive, then you could easily get those over to your main system after cleaning or fixing the problem. So, in short, don’t let someone sell RAID to you as an end-all backup solution. It’s really more for performance and/or fault tolerance.

With that said, let’s briefly discuss the benefits of RAID 5, newly supported on the nForce4 SLI MCP. Until recently, RAID 5 was utilized almost exclusively in servers, massive storage arrays and high-end workstations, and it was not affordable at the consumer level. With storage being relatively cheap these days and considering that its one of the most popular RAID levels in the industry, it really does make a lot of sense to bring RAID 5 to the consumer level. While RAID 0 provides increased performance and RAID 1 provides a copy, RAID 5 improves disk performance and provides fault tolerance. This level of RAID requires a minimum of three hard drives.

In addition to RAID 5 support, MediaShield features a dual-controller architecture instead of the industry-standard single-controller architecture. As you might expect, the advantage of a dual-controller architecture is that it provides two separate and indepedent transfer paths to and from system memory, which can result in twice the bandwidth to disk. We’ll have to explore this in more depth in the near future to see how much real-world benefit we really see from this architecture design.

NVIDIA’s MediaShield Storage solution also boasts the following features:

Serial ATA 3Gb/s (SATA2) Support

  • Support for up to four native SATA2 3Gb/s devices.
  • Hot-swap capability, allowing disks to be changed without powering down the system.
  • Optimization for the high-performance MediaShield storage RAID technology.

Native Command Queuing (NCQ) Support

  • NCQ is a SATA command protocol that allows multiple commands to be simultaneously outstanding within a drive.
  • Helps overcome mechanical limitations and increases storage performance on random workloads by allowing the drive to internally optimize the order of commands.

Disk Alert System

  • Facilitates identification of failed disks in an array.
  • An alert displays an image of the system motherboard and highlights the failing port so you know exactly which drive to replace.

Spare Disk Allocation

  • Offers even more protection for your data.
  • A dedicated spare drive can be configured as a hot standby and can take over for a failed disk until the repair is completed.


  • Allows users to change the current state of the disk or array to another with a one-step process.
  • Lets users upgrade their current disk or array for more performance, higher security and higher capacity.

Cross-Controller RAID

  • Supports Serial ATA and parallel ATA disk devices within a single multidisk (RAID) array.
  • Single setup procedure applies to all drives.

Intuitive User Interface

  • Point-and-click operations lead users through the steps to specifiy which disks to configure in an array, turn on striping and build mirroring volumes.
  • Configuration changes can be quickly and easily carried out at any time, using the same interface.


$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$


As you already know and unlike AMD’s Athlon 64 CPUs, Intel’s Pentium 4 Prescott processors do not feature an integrated memory controller. Because of this, NVIDIA’s engineers were required to design a memory controller for the nForce4 SLI Intel Edition mainboards. With their focus on maximizing system performance, the designers developed a number of innovative features for the DDR2 memory controller, which resides in the SPP chip.

Memory Controller Features

  • DualDDR2 memory architecture
  • High-speed DDR2 memory support
  • Dedicated address and command bus per DIMM
  • Efficient bus utilization
  • NVIDIA dynamic adaptive speculative preprocessor (DASP) 3.0
  • NVIDIA QuickSync™ technology

NVIDIA introduced its dynamic adaptive speculative preprocessor (DASP) when it launched the original nForce IGP and SPP. Then, the more sophisticated DASP 2.0 was introduced with nForce2. Now, with the nForce4 SLI Intel Edition, NVIDIA overhauled the prefetcher to create DASP 3.0. I don’t want to get too technical in this article, so I won’t get into the details about the technology. Basically, the DASP 3.0 is an integrated preprocessor that reduces system latency and helps to maximize performance. DASP is one of the many extra steps that NVIDIA takes to offer the best performance possible.

Another step NVIDIA has taken to maximize performance is the development of its patent-pending QuickSync synchronization technology, which transfers memory requests and data between the FSB (front-side bus) and memory clock domains in the shortest amount of time. In other words, QuickSync is designed to minimize memory latency. According to NVIDIA’s “Memory Controller Technology” technical brief, “QuickSync accomplishes this by speeding up the internal paths between the FSB clock domain and the memory clock domain as the FSB bus speed and/or the memory bus speed increases.”

NVIDIA really put a lot of time and effort into trying to create the best and most sophisticated memory controller in the industry. With all the focus on performance and attention towards squeezing every last drop of performance out of current DDR2 capability and with nForce’s excellent track record on the AMD side of things, it’s not too hard to imagine that NVIDIA will be a forced to be reckoned with when it comes to memory performance in the Intel world.

$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$


We are fortunate enough to have an actual nForce4 SLI Intel Edition motherboard and test system for testing so that we can show you some actual performance numbers rather than only talking about theoretical results. The test system and the comparison system are different in several ways, so please take a look at the test system configurations listed below. I decided to compare the Intel nForce4 system to one of the best performing LGA775 boards I had on hand – the ABIT AA8 DuraMAX. I haven’t had the chance to run an AMD nForce4 SLI system with a pair of 6800 GTs, so that’s the main reason I’m not comparing an Athlon 64 nForce4 system to the Intel nForce4 SLI.

Corsair’s new CM2X512A-5400UL

nForce4 SLI Intel Edition Reference Configuration

  • Intel Pentium 4 560 (3.6GHz)
  • Reference nForce4 SLI Intel Edition – 7.02 nForce driver package
  • 1GB 675MHz Corsair DDR2 (2 x CM2X512A-5400UL)
  • 2 x NVIDIA Reference PCI Express GeForce 6800 GT – DirectX 9.0c, ForceWare 71.84
  • 74GB Western Digital 10k Raptor SATA Hard Drive
  • Windows XP with Service Pack 2
  • FSB = 800MHz (QDR)
  • Memory = 667MHz (DDR)

ABIT AA8 DuraMAX 925X Configuration

  • Intel Pentium 4 560 (3.6GHz )
  • ABIT AA8 DuraMAX
  • 1GB Corsair Twin2X1024-5400 PRO DDR2
  • NVIDIA Reference PCI Express GeForce 6800 GT – DirectX 9.0c, ForceWare 66.93
  • 2 x 120GB DiamondMax9+ SATA Hard Drive w/ 8MB Buffer
  • Windows XP with Service Pack 2
  • FSB = 800MHz (QDR)
  • Memory = 533MHz (DDR)


  • FutureMark PCMark2004 v130
  • SiSoftware Sandra 2005 SR1
    • CPU Arithmetic
    • CPU Multi-Media
    • Memory Bandwidth
    • File System
  • SYSMark2004 SP2
  • Super PI
  • POV-Ray 3.6
  • HD Tach 3
  • FutureMark 3DMark03 v360
  • FutureMark 3DMark05 v120
  • AquaMark3

Due to the limited amount of time I had to complete this article before the deadline, I was unable to complete an extensive number of gaming benchmarks. I’ll try to make up for that when we get our first retail nForce4 SLI Intel Edition samples.

$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$


$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$


Super PI and POV-Ray

The Super PI benchmark calculates the number pi out to a specified number of digits. I selected the highest option, 32 million. This benchmark really tests the CPU more than anything, so close results should be expected, and that’s exactly what we see. The two boards put up almost identical numbers. Lower time is better.

Super PI – 32M

Mobo Result

nF4 SLI Intel

30 min 13 sec


30 min 14 sec

Another CPU-intensive benchmark that I ran is POV-Ray 3.6 (Persistence of Vision Ray-Tracer). POV-Ray is a freely available tool that can be used for ray-tracing, and it has a built-in benchmark capability, which is what I used for this comparison. Higher score is better.

POV-Ray 3.6

Mobo Result

nF4 SLI Intel

102.79 PPS


94.80 PPS

File System – Sandra 2005 and HD Tach

Because the systems are using totally different hard drives, I’m only including the nForce4 SLI Intel Edition results here since the comparison isn’t relevant or appropriate.

Sandra 2005 File System


57 MB/s

HD Tach 3

Average Read

65.1 MB/s

Burst Speed

127.3 MB/s

Access Time

7.7 ms

$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$


$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$


Without a doubt, NVIDIA has created a very promising and feature-rich Intel platform, and I think the company can capture a nice chunk of the Intel motherboard market in a relatively small amount of time. nForce’s high reputation and standards are only extended and built upon with this launch. And to the hardcore doubters, this is not a paper launch. NVIDIA is proud to have met its Q1 promise. Look for retail boards from all the major players by the end of this month. You’ll probably start seeing reviews of them in the next week or two.

This is of course the first NVIDIA nForce solution for the Intel market, and I think it’s exciting to see how it will change the Intel chipset landscape in the coming months. The impact could be minimal of course, but I seriously doubt that since NVIDIA offers a variety of innovative and progressive features for enthusiasts and average consumers alike.

nForce4 SLI Intel Edition is only the start of NVIDIA’s entrance into the world of Intel. There will be a plethora of other Intel-based NVIDIA products coming to the market soon. How about media PCs, laptops, servers and workstations? Sure! For now though, NVIDIA is focused on the enthusiast market because demand is particularly strong right now, thanks in big part to NVIDIA’s own SLI technology.

According to NVIDIA, more than 350,000 nForce4 SLI chips have already shipped, and this is before an Intel SLI platform has even entered the retail picture. So, you can easily imagine how broadening its user base to Intel fans is going to lead to even greater success for NVIDIA. No matter what you think of this launch, you must admit that it’s damn good business sense. Dual core Intel processors are right around the corner, and this chipset will support them. You have to make sure the manufacturer claims to support dual cores, though, because some might opt not to include the support for whatever reason.

For more info, you can of course visit Be sure to check out the latest version of nTune, which now includes Dynamic Application Sensing. And be sure to check back here in the coming months for retail board reviews.

$$ FIND THE BEST PRICES FOR nForce4 SLI Motherboards $$

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