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Our testing methods
As ever, we did our best to deliver clean benchmark numbers. Tests were run at least three times, and the results were averaged.

Our test systems were configured like so:

Processor Core 2 Extreme X6800 2.93GHz
System bus 1066MHz (266MHz quad-pumped)
Motherboard XFX nForce 680i SLI
BIOS revision P31
North bridge nForce 680i SLI SPP
South bridge nForce 680i SLI MCP
Chipset drivers ForceWare 15.08
Memory size 4GB (4 DIMMs)
Memory type 2 x Corsair TWIN2X20488500C5D
at 800MHz
CAS latency (CL) 4
RAS to CAS delay (tRCD) 4
RAS precharge (tRP) 4
Cycle time (tRAS) 18
Command rate 2T
Audio Integrated nForce 680i SLI/ALC850
with RealTek drivers
Graphics GeForce 8800 GT 512MB PCIe
with ForceWare 169.01 drivers
XFX GeForce 8800 GTS XXX 320MB PCIe
with ForceWare 169.01 drivers
EVGA GeForce 8800 GTS OC 640MB PCIe
with ForceWare 169.01 drivers
Radeon HD 2900 XT 512MB PCIe
with Catalyst 7.10 drivers
Hard drive WD Caviar SE16 320GB SATA
OS Windows Vista Ultimate x86 Edition
OS updates KB36710, KB938194, KB938979, KB940105, DirectX August 2007 Update

Please note that we're using "overclocked in the box" versions of the 8800 GTS 320MB and 640MB, while we're testing a stock-clocked GeForce 8800 GT reference card from Nvidia.

Thanks to Corsair for providing us with memory for our testing. Their quality, service, and support are easily superior to no-name DIMMs.

Our test systems were powered by PC Power & Cooling Silencer 750W power supply units. The Silencer 750W was a runaway Editor's Choice winner in our epic 11-way power supply roundup, so it seemed like a fitting choice for our test rigs. Thanks to OCZ for providing these units for our use in testing.

Unless otherwise specified, image quality settings for the graphics cards were left at the control panel defaults. Vertical refresh sync (vsync) was disabled for all tests.

We used the following versions of our test applications:

The tests and methods we employ are generally publicly available and reproducible. If you have questions about our methods, hit our forums to talk with us about them.