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Our testing methods
As ever, we did our best to deliver clean benchmark numbers. Our test systems were configured like so:

Processor Core i7-3820
Motherboard Gigabyte X79-UD3
Chipset Intel X79 Express
Memory size 16GB (4 DIMMs)
Memory type Corsair Vengeance CMZ16GX3M4X1600C9
DDR3 SDRAM at 1600MHz
Memory timings 9-9-9-24 1T
Chipset drivers INF update
Rapid Storage Technology Enterprise
Audio Integrated X79/ALC898
with Realtek drivers
Hard drive Kingston HyperX 480GB SATA
Power supply Corsair AX850
OS Windows 8.1 Pro

Driver revision GPU base
core clock
GPU boost
GeForce GTX 780 Ti GeForce 337.50 875 928 1750 3072
2 x GeForce GTX 780 Ti GeForce 337.50 875 928 1750 3072 (x2)
Radeon HD 7990 Catalyst 14.4 beta 950 1000 1500 3072
XFX Radeon R9 290X Catalyst 14.4 beta - 1000 1250 4096
Radeon R9 295 X2 Catalyst 14.4 beta - 1018 1250 4096 (x2)

Thanks to Intel, Corsair, Kingston, Gigabyte, and OCZ for helping to outfit our test rigs with some of the finest hardware available. AMD, Nvidia, and the makers of the various products supplied the graphics cards for testing, as well.

Also, our FCAT video capture and analysis rig has some pretty demanding storage requirements. For it, Corsair has provided four 256GB Neutron SSDs, which we've assembled into a RAID 0 array for our primary capture storage device. When that array fills up, we copy the captured videos to our RAID 1 array, comprised of a pair of 4TB Black hard drives provided by WD.

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.

In addition to the games, we used the following 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.