Futuremark 3DMark 05
Joining two GeForce 6600 GT cards in a SLI configuration leads to a twofold performance gain – they can even contend with the RADEON X850 XT PE/X800 XT PE. The efficiency of the GeForce 6800 Ultra SLI is somewhat lower, about 85-90 percent, but that’s a good result anyway.
The performance gain is about 90-100 percent with both SLI configurations in the first game test. That’s why the more expensive configuration of two GeForce 6800 Ultra cards wins this test, while the less expensive SLI system of two GeForce 6600 GT keeps even with ATI’s top-performance devices.
The GeForce 6600 GT SLI system refused to run this test in high resolutions with enabled full-screen antialiasing and anisotropic filtering due to the lack of the graphics memory. Yet it was a little behind the single GeForce 6800 Ultra even in 1024x768 – that’s another proof of the necessity of big amounts of graphics memory in modern applications. As for the GeForce 6800 Ultra SLI platform, its efficiency in the “eye candy” mode is going down as the resolution grows up. In 1600x1200 this system is just a tiny step ahead of the RADEON X850 XT Platinum Edition.