|Benchmark||Radeon HD 6990||Radeon HD 6970 |
|GeForce GTX 570 SLI|
| Crysis (no AA)||44|| 52.94||45.46|
| Crysis (8x AA)||38.7|| 46.39||38.29|
| Far Cry 2 Action (no AA)||78.93||77.4|| 81.16|
| Far Cry 2 Action (8x AA)||76.79|| 78.24||72.01|
| Far Cry 2 Ranch (no AA)||133.2||134.26|| 138.59|
| Far Cry 2 Ranch (8x AA)||100.4|| 109.29||98.45|
| STALKER CoP (no AA)||84.25||92.1|| 149.35|
| STALKER CoP (4x AA) ||67.7||74.8|| 123.27|
| Metro 2033 DX11||24||25.67|| 26.67 |
| Metro 2033 DX11 (4x MSAA)||22.33|| 24 ||8.12 |
| Metro 2033 DX10 (4x MSAA)||32 || 34.33 ||23.33 |
While the results are fairly close, the dual-video card configurations beat out the 6990 in all tests. The deltas between the 6990 and the two 6970s in CrossFire should be the most interesting, since they're both using almost the exact same GPUs, just at different core clocks (830MHz vs 880MHz). Two 6970s destroy the 6990 in Crysis and STALKER, but performance is about the same in Far Cry 2 and Metro 2033. Considering that the 6970 is just a little over half the price of the 6990, it seems like there's little incentive to pick up the 6990 if you have a power supply that can handle two 6970s in CrossFire. Two 6970s do consume more power at full load than a single 6990, but they're still quieter and the two-card configuration will fit in more cases than the single 12" video card.
Two GTX 570s in SLI also prove to be performance winner, claiming the lead in around half the tests. They also have the advantage of only requiring two six-pin PCI-E power connectors for each card as opposed to the six and eight-pin connectors needed for the 6970. The 570s are also selling right at $350, so once again you're getting a better value buying two of these than a single 6990.
One final note--I ran the Crysis 2 multiplayer demo with all three of these configurations, and while the demo doesn't have a built-in benchmark, framerates during gameplay were silky smooth at the Hardcore graphics settings. So yes, with a 6990 or two high-end graphics cards, you can play Crysis 2 at 2560x1600.