Multi-GPU gaming performance
Our first round of gaming tests was conducted with more modest in-game detail levels and display resolutions in order to remove the graphics subsystem as a performance-limiting factor, but we've cranked things up for a second round. These tests use high resolutions, high detail levels, and anisotropic filtering and antialiasing. We've tested each board with a single GeForce 7900 GTX. The nForce 570 SLI and nForce4 SLI X16 were also tested with a second 7900 GTX running in SLI. On the CrossFire front, the 975X was tested with a Radeon X1900 XTX in single-card and CrossFire configurations. Since the P965 only gained CrossFire support yesterday through ATI's latest Catalyst graphics drivers, and then only for Direct3D applications, it will have to make do with a single GeForce 7900 GTX this time around.
Our purpose here is not to compare the merits of SLI versus CrossFire, or even the GeForce 7900 GTX with the Radeon X1900 XTX. Instead, we're looking at how performance scales when a second graphics card is installed.
The performance of our multi-GPU systems scales predictably. Note that the nForce4 SLI X16 doesn't have a clear advantage over the nForce 570 SLI, despite the fact that the 570 SLI is limited to a dual eight-lane PCI Express config rather than a true, dual-16-lane SLI implementation
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