Hmm if that is truely the memory frequency, that kind of sucks. 160GB/s assuming thats the reference ( stock ) clock. The 5870 does 160GB/s at 1250 on a 256bit bus. I hope it is indeed higher as it would be nice to see the cards extra VRAM running at higher speeds which will be of benifit at higher resolutions no doubt. I really don't see the 470 having worse bandwidth ( worse being the same which generation to genertion is kinda meh ) than the 285 though... Who knows mabey the 480 will only be 1200 (240GB/s)... ( I've estimated 1200-1300ish )
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