boxleitnerb
Platinum Member
- Nov 1, 2011
- 2,605
- 6
- 81
You didn't understand my point. The midrange keplers with 256bus struggle at 1600p due to lack of bandwidth, its already starved at 1080p. Look at the GE vs 770/680, at 1080p, the 770 is actually faster than 7970 GE, but its opposite at 1600p. Tahiti just scales better at higher res, and this is amplified in the 7990 vs 690 scenario. This doesn't occur for GK110 based skus, because it has ample bandwidth to cope and it performs well at 1080p and 1600p.
CoH2 doesn't have CF/SLI support because they used massed dynamic terrain deformation using compute, they could not do GPU <-> GPU compute load transfers. Relic has stated as such and no CF/SLI gains are possible with their implementation. So unless there's some magic driver fix that bypass the way the developers designed their engine..
You also have to take into account shading performance which GK104 has much less of. Let's put it this way: Tahiti loses efficiency at lower resolutions (due to the frontend), but at higher ones it can play its GFLOPs card. Bandwidth certainly is a factor, too.