Remember CrossFire at 4K is still broken on everything but the latest GCN 1.1 hardware from AMD.īattlefield 3 starts out telling the story I expected to see. You'll notice that I didn't run anything at 4K for these tests. In other words, the other cards will have a definite CPU performance advantage (20 - 30% depending on the number of active cores). Keep in mind that the comparison cards are all run on our 2014 GPU testbed, which is a 6-core Ivy Bridge E (i7-4960X) running at 4.2GHz. In the case of a memory bandwidth limited scenario the gap can shrink to 9%.Īll of the results below are using the latest Radeon WHQL drivers at the time of publication (13-12_win7_win8_64_dd_ccc_whql.exe) running 64-bit Windows 8.1. I've put all of the relevent information about the differences between the GPUs in the table below:ĭepending on thermal conditions the 280X can be as little as 17% faster than the D700 or as much as 30% faster, assuming it's not memory bandwidth limited. The key comparison here is AMD's Radeon R9 280X CF.
I ran the new Mac Pro with dual FirePro D700s through a few of Ryan's 2014 GPU test suite games. Under Windows however it's just a matter of enabling CrossFire X. As I mentioned earlier, under OS X games have to specifically be written to use both GPUs in the new Mac Pro.
