Quote Originally Posted by xBanzai89 View Post
I'm confused here. Is a 4D arrangement with 1600 SP (with 400 per section) or one with 1280 SP (with 320 per section same as 5870) perform similar to a 5D like the 5870 that has 1600 SP (with 320 per section)?
320x4 would perform similar to 320x5. So, 400x4 would be ~25% faster. Now shader performance isn't everything so unless other parts are beefed up these 25% is in best case.