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If you plan to play Flight sim a lot, it's worth noting that the ATI cards perform extremely poorly with any sort of cloud structure at all.
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But then you overclock the 6970
Really, I do get slightly annoyed when people say that one overclocked card beats a stock card. It's just a nonsensical comment, like if I said I could jump higher than you if I had the legs of a kangaroo and you didn't.![]()
a 25% overclock:
Amd 6950 2Gig With Shaders Unlocked
1ghz Core(Stock 800Mhz)
Memory 1.3Ghz(Stock 1.25Ghz)
1.265V (Stock 1.1V)
Kombuster Run MAX temps 50c
Cooled By Modded Arctic Cooling Accelero Xtreme 5870 VGA Cooler
5 min video (pretty boring but you can skip to the end to see that it's stable)
come off it -its very rare to go above framebuffer at 1900x1200 unless crazy amounts of AA
GTA4 excepted
I know Crysis can again - but on some extreme settings
you only have to look at reviews, even at 2560 + AA of the 1gb vs 2gb 6950 to no difference (appreciable) in performance

But then you overclock the 6970
Really, I do get slightly annoyed when people say that one overclocked card beats a stock card. It's just a nonsensical comment, like if I said I could jump higher than you if I had the legs of a kangaroo and you didn't.![]()
, it is risk free performance.With a smaller framebuffer you will run out of memory, which will mean that the card has to unload some of the other textures and then load them back again. This will cause the image not to be as smooth - I have suffered it and that is why I avoid powerful cards with small framebuffers these days.
It is all well and good to show 50fps on the screen if it feels like 30 fps. Good for benchmarks but not good for the end user. As the Hard OCP review says, the 6970 offers a superior gaming experience.
When crossfiring the difference is even clearer, the 6950 at 6970 speeds is the much better card too.
If you want good, safe overclockability buy a 480 which apart from the noise delivers a much better gaming experience than a 570 and its cheaper than both a 6950 and a 570 to boot.
Bear in mind that the 570 overclocking is limited to 1.1V on the core due to cheaper 4 phase design and lower quality VRMs used. If you go above that you are risking killing the card.
My Asus 570 is unlocked all the way up to the fermi max of 1.213V?
At 1.1V I can clock it to 890 core, 1050 memory. At 1.213V I can go to 940 core, 1180 memory although the fan works too hard at that.

Cherry picked pre-overclocked card, that's not a reference one though.I'd take a look at this then:
http://www.vortez.net/articles_pages/inno3d_gtx570_1_25gb_review,23.html
Even with both overclocked, the GTX570 is better.
Cherry picked pre-overclocked card, that's not a reference one though.
As it's cherry picked.They just happen to clock it higher.