Testbeds used for this review consisted of:
AMD Athlon64 FX-60
ASUS A8N32 SLI Deluxe for 7950GX2 and 7900GTX cards
DFI Lanparty UT CFX3200-DR for ATI X1900 Crossfire and X1900XTX cards
OCZ Platinum Revision 2, 2x512 MB
OCZ GameXtreme 700W PSU
Western Digital Raptor 36 GB
Dell 3007FPW display
We benchmarked five games: Far Cry, Quake 4, F.E.A.R., The Chronicles of Riddick and Battlefield 2. The resolutions used:
2560x1600
2048x1536
1920x1200
1600x1200
Modes used:
4xAA, 16xAF
16xAA, 16xAF
32xAA, 16xAF (only QuadSLI in 1600x1200)
Since we had two 7950GX2 cards at our disposal, we decided to try the "unsupported" QuadSLI. We must point out that this setup is not yet finalized, and that the performance of the final product (final version of the drivers) may be different. The "patch" for this testing setup is available on the Internet, and although some performance results seem a bit strange, we're very sure that the final driver revisions (to be released in the mid-June) will offer very different numbers in benchmarks where performance might not be "up to speed".
We benchmarked a total of 6 setups:
7900GTX
7900GTX SLI
X1900XTX
X1900 Crossfire
7950GX2
7950GX2 QuadSLI
We must point out the fact that we're really, REALLY pleasantly surprised with some things we noticed by purely using our hands and eyes. Although the latest addition to our testing system (OCZ's GameXtreme) is a very powerful PSU (yet again, hats off to OCZ for this one), we couldn't help but notice that this PSU doesn't really put very much effort when "feeding" two 7950's with power, and that it was a noticeable bit warmer when we benchmarked CrossFire setup.