shrkbay :
@matt, they mostly used games that favour nVidia and if you look at games that are neutral (like metro 2033 or Crysis) then GTX560Ti @ 1050 (~22%OC from stock), which is quite impossible to reach, is only 10% ahead of 6950 on metro and 5% on Crysis. GTX560Ti would match 6950 only if it is OCed to ~925, which is the clock that almost every 560 reaches, but not every 560 can overcome it...
OP: @950 560 will not beat 6970, you would need over 1100Mhz OC to reach 6970 performance and as i said most of 560Tis don't even reach 950.
Any review that uses Dragon Age 2 and F1 (HardOCP) is definitely not favoring Nvidia.
Not only do most GTX 560's reach 950 mhz, many come with that for a factory overclock. All you need to do is look at a review of the MSI GTX 560 Hawk, Zotac AMP!, Gigabyte SOC, or several others clocked at 950 mhz or above. At 950 mhz and above you really need to focus on the actual games being played and whether or not you like PhysX or value tesselation performance, etc. because the performance of a good GTX 560 is very much in the 6950/6970/GTX 570 range.
"The MSI N560GTX-Ti Hawk was definitely impressive! With some minor refinements this card could probably push the core overclocking further and thus improve the already high performance! The card is able to match and sometimes beat an AMD HD 6950 and tie most of the time with the GTX 570 while costing much less than both. Overclocking was able to increase the core speed from 950MHz to 1010MHz stable with stints up to 1050MHz. The memory speed was increased from 1050MHz all the way to 1250MHz with headroom left, a dramatic increase!"
http://www.overclockersclub.com/reviews/msi_560gtx_hawk/16.htm
"This is a killer card! Sure, we're dealing with the SOC version of the new GTX 560 Ti, but it puts out some unreal results and while it carries a slightly larger price tag than the reference one at $269, the performance it offers means that the card still has no problem topping the TPR charts. The big question is, how does AMD come back against this? You've got a card that really offers HD 6970 performance, at HD 6870 prices."
http://www.tweaktown.com/reviews/3796/gigabyte_geforce_gtx_560_ti_1gb_soc_video_card/index21.html
"The redesigned PCB and advanced cooling on Zotac's GTX 560 Ti AMP! edition means that straight out of the box it's hitting a massive 950MHz core clockspeed. That overclock makes it significantly faster than the reference board across the full suite of benchmark tests we run. It also means the card outperforms the reference Radeon HD 6950, and is actually snapping at the heels of the GeForce GTX 570. Interestingly it's also trading blows with AMD's fastest single-GPU card, the Radeon HD 6970, in all but the tessellation-heavy DX11 benchmarks."
http://www.techradar.com/reviews/pc-mac/pc-components/graphics-cards/zotac-geforce-gtx-560-ti-amp--926763/review?artc_pg=3