nForce4: PCI Express and SLI for Athlon 64
by Wesley Fink on October 19, 2004 12:01 AM EST- Posted in
- CPUs
SLI Performance
For months, nVidia has been sneaking peeks at their upcoming Dual Video card capabilities, based on a technology known as SLI, or Scalable Link Interface. Not since the PCI Voodoo 2 from 3dfx in 1996 have we seen such a solution from a major graphics vendor. Of course, history saw the original 3dfx die in the market place. The single-slot AGP was introduced, 3dfx lost the video wars, and nVidia purchased what was left of 3dfx.We have been told that 3dfx engineers had quite a bit to do with the design of the new GeForce 6 series, and that is finally starting to make sense when we see that SLI capabilities are built into the 6 series video cards. Dual AGP would require a custom design, but PCI Express, like PCI in the past, finally provides the kind of platform that nVidia needed to launch a new SLI solution.
While nVidia was not ready to ship nForce4 SLI reference boards for review, they were demonstrating a major manufacturer's nF4 SLI board with a pair of nVidia 6800 Ultra video cards at 1600x1200 resolution at 4x AA. We also got to play with the SLI system with an Athlon 64 4000+ CPU, confirming benchmarks that were supplied by nVidia.
| Single GPU vs. SLI - nForce4 SLI | |||||||||
| 6600GT | 6800GT | 6800 Ultra | |||||||
| Single | SLI | % Increase | Single | SLI | % Increase | Single | SLI | % Increase | |
| Doom3 | 17.3 | 32 | 85% | 37.9 | 65.2 | 72% | 42.4 | 71.7 | 69% |
| Halo | 37.23 | 58.58 | 57% | 50.01 | 72.76 | 45% | 57.21 | 79.01 | 38% |
| 3DMark05 | 3186 | 5698 | 85% | 4588 | 8271 | 80% | 5211 | 9297 | 78% |
Increases in video performance from 38% to 85% are certainly impressive, and there are gamers and performance enthusiasts who will be flocking to the new nForce4 SLI boards as soon as they start shipping in the next few weeks. Perhaps the most impressive gain here is the performance leap with a pair of SLI 6600GT video cards. Two of these less than $200 cards are actually faster in most benchmarks compared to a single $400 6800GT. This provides an interesting upgrade path for many users. Of course, a pair of 6800GT or 6800 Ultra cards take performance to levels that we have never seen before.
Click to enlarge.
Shipping boards will allow a single video card of any brand at x16 PCIe or 2 nVidia video cards in two x8 PCIe slots in SLI mode. The SLI boards can be switched easily from x16 to SLI mode by switching a programming card on the board.
Click to enlarge.
nVidia says that the first nForce4 SLI boards will be available in the next few weeks from Asus and MSI. Other manufacturers will also be supplying SLI motherboards later this year.
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Viper96720 - Tuesday, October 19, 2004 - link
Hope a 754 version of the sli capable board is made. Woldn't mind getting the board and a 6600GT. Then getting the second 6600 later on. Since I got an 754pin cpu already. Guess I know what I want for Christmas.swatX - Tuesday, October 19, 2004 - link
drool!!!!!!!!!!ViRGE - Tuesday, October 19, 2004 - link
#17, there is no Soundstorm, it's a figment of everyone's imaginations. Nvidia has already stated with the nForce 3 that they really aren't interested in doing another advanced sound solution (in part due to Creative's purchase of Sensaura, I'm sure), so there's no reason to really harp on them.Rys - Tuesday, October 19, 2004 - link
NDA has yet to expire on nForce4 (5.5 hours early at the time of posting this).Davediego - Tuesday, October 19, 2004 - link
What happened to SoundStorm2? Why isn't audio even mentioned in this article other than 1 line in the basic feature table on pg7? This is a major feature many many enthusiasts have been waiting for, and if it doesnt exist in nforce4 why is anandtech not harping nvidia for it?allnighter - Tuesday, October 19, 2004 - link
Not trying to be rude, but there is an abundance of good articles on nVidia's SLi that will help better understanding and answer many of the questions asked here.#15 I believe each card will load textures for the part it will render and the driver will handle that load on the fly.
Kovie - Tuesday, October 19, 2004 - link
Probably a stupid question but does anyone know if in SLI mode the system has to keep two separate copies of textures in video memory (each card has the same textures loaded) or if they can just keep it on one card and make two 128mb cards into a 256mb?Doormat - Tuesday, October 19, 2004 - link
Is that SATA 3Gb/s real SATA II? I remember seeing something about switches that allow 4 drives to hook into 1 sata 2 port. Is that a feature NF4 supports?xsilver - Tuesday, October 19, 2004 - link
A little off topic.. but why doesn't intel bring out 1066 products now? my year old northwood is already running 1000 fsb...GhandiInstinct - Tuesday, October 19, 2004 - link
Roger that, also can the SLI or Alienware have Agp also? Will the N4 have agp?