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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 we've reported the median result.

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 9-9-11-24 1T
Chipset drivers INF update 9.3.0.1019
Rapid Storage Technology Enterprise 3.0.0.3020
Audio Integrated X79/ALC898
with Realtek 6.0.1.6526 drivers
Hard drive Corsair F240 240GB SATA
Power supply Corsair AX850
OS Windows 7 Ultimate x64 Edition
Service Pack 1
DirectX 11 June 2010 Update

Driver revision GPU base
clock
(MHz)
Memory
clock
(MHz)
Memory
size
(MB)
EVGA GeForce GTS 250 GeForce 306.02 beta 770 1123 1024
Asus ENGTX 260 TOP (215 SPs) GeForce 305.37 beta 650 1150 896
Asus GeForce GTX 460 TOP GeForce 306.02 beta 775 1000 1024
Galaxy GeForce GTX 470 GC GeForce 305.37 beta 625 837 1280
Asus GeForce GTX 560 Ti TOP GeForce 305.37 beta 900 1050 1024
GeForce GTX 660 GeForce 306.02 beta 980 1502 2048
Asus GeForce GTX 660 TOP GeForce 306.02 beta 1072 1527 2048
Zotac GeForce GTX 660 GeForce 306.02 beta 993 1502 2048
PNY GeForce GTX 660 Ti GeForce 305.37 beta 915 1502 2048
MSI GTX 660 Ti Power Edition GeForce 305.37 beta 1020 1502 2048
Zotac GeForce GTX 660 Ti AMP! GeForce 305.37 beta 1033 1652 2048
Zotac GeForce GTX 670 AMP! GeForce 305.37 beta 1098 1652 2048
Radeon HD 7850 Catalyst 12.7 beta 1100 1200 2048
MSI R7870 Hawk Catalyst 12.7 beta 1100 1200 2048
MSI R7950 OC Catalyst 12.7 beta 880 1250 3072
Radeon HD 7950 w/Boost Catalyst 12.7 beta 850 1250 3072

Thanks to Intel, Corsair, and Gigabyte 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.

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 test applications:

Some further notes on our methods:

  • We used the Fraps utility to record frame rates while playing either a 60- or 90-second sequence from the game. Although capturing frame rates while playing isn't precisely repeatable, we tried to make each run as similar as possible to all of the others. We tested each Fraps sequence five times per video card in order to counteract any variability. We've included frame-by-frame results from Fraps for each game, and in those plots, you're seeing the results from a single, representative pass through the test sequence.

  • We measured total system power consumption at the wall socket using a Yokogawa WT210 digital power meter. The monitor was plugged into a separate outlet, so its power draw was not part of our measurement. The cards were plugged into a motherboard on an open test bench.

    The idle measurements were taken at the Windows desktop with the Aero theme enabled. The cards were tested under load running Skyrim at 2560x1440 with the Ultra quality presets, 4X MSAA, and FXAA enabled.

  • We measured noise levels on our test system, sitting on an open test bench, using an Extech 407738 digital sound level meter. The meter was mounted on a tripod approximately 10" from the test system at a height even with the top of the video card.

    You can think of these noise level measurements much like our system power consumption tests, because the entire systems' noise levels were measured. Of course, noise levels will vary greatly in the real world along with the acoustic properties of the PC enclosure used, whether the enclosure provides adequate cooling to avoid a card's highest fan speeds, placement of the enclosure in the room, and a whole range of other variables. These results should give a reasonably good picture of comparative fan noise, though.

  • We used GPU-Z to log GPU temperatures during our load testing.

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.