Quote Originally Posted by Chumbucket843 View Post
there is more going on than sp's and memory bandwidth.

for a long time it has been a mystery as to why the 5870 was only 60% faster than the 4890 while doubling almost everything. then the card was still liked because nvidia could barely beat their previous gen, and everyone stopped talking about why it wasnt much faster.

perhaps whatever bottleneck(s) the 5870 had has been improved in SI.
The IPC of each SP for AMD and NVIDIA for Dx11 generation is generally lower than Dx10 equivalents.

That means Dx11 has something to do with latency / complexity of instructions?