Nemesis11
Power Member
http://www.hardwareanalysis.com/content/article/1728/
Whereas Voodoo2 SLI used a ribbon cable to be connected between two Voodoo2 cards internally and a pass through VGA cable externally to distribute the analog signal Nvidia's implementation is all done in the digital domain. Both 6800 series PCI-E cards are connected by means of a SLI, Scalable Link Interface, dubbed the MIO port, a high-speed digital interconnect which connects to a connector on top of both cards. Through this MIO port both cards communicate to each other and distribute the workload which is accelerated by dynamic load-balancing algorithms. In essence the screen is divided vertically in two parts; one graphics card renders the upper section and the second graphics card renders the lower section. The load balancing algorithms however allow it to distribute the load across the graphics processors. Initially they'll both start out at 50% but this ratio can change depending on the load. Although Nvidia has remained tight-lipped about what makes their SLI implementation tick exactly it is clear that both hard- and software contribute to making SLI work. Most of the dynamic load balancing between the two graphics processors is handled in software and thus SLI needs driver support, drivers which are as of yet unreleased, to work.
Exact performance figures are not yet available, but Nvidia's SLI concept has already been shown behind closed doors by one of the companies working with Nvidia on the SLI implementation. On early driver revisions which only offered non-optimized dynamic load-balancing algorithms their SLI configuration performed 77% faster than a single graphics card. However Nvidia has told us that prospective performance numbers should show a performance increase closer to 90% over that of a single graphics card.
UPDATE:
http://www.sudhian.com/showdocs.cfm?aid=558
# Will be Offered in Future Athlon 64 Chipsets: Although NVIDIA wasn’t exactly jumping up and down to offer details, we know that future Athlon 64 chipsets will offer dual PCI-E support. When and which isn’t clear; presently support is only available on Intel’s Tumwater.
# Will be Present on All 6800 PCI-Express cards: We don’t know yet about the 6800 standard, but SLI will be possible using both the 6800 GT and the 6800 Ultra (PCI-Express versions only, obviously).
# Available for both Quadro and GF FX Cards: NVIDIA isn’t going to confine SLI to just the desktop market; Quadro PCI-Express cards will be SLI-capable as well.
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