Good job doing benchies Wiz, but why is your QPI so freaking high for a 990x?
Look at your GPU usage under the Crysis benchmark, its looks to be about 65~70% as well. I anticipate you might have an unstable overclock, probably CPU territory.
On the Crysis 4GHz run, you look to be undervolted quite a bit, have you run stability testing? If you are getting core errors, its going to greatly reduce you score. Over voltage on the QPI can increase likelihood of this as well.
You maybe able to increase your scores greatly without increasing your speed, just adjusting the voltages.
I personally run (for 24/7) 4.100 GHz @ 1.270v (full load), so about 1.31875v in BIOS with VDroop on. My QPI is only +75mV, so its stock of 1.200v + 75 = 1.275v, with a 30 mV LLC, making it 1.305~1.310 at full load. You are entitled to run things however you want, but the Gulftowns are more sensitive from voltages when it comes to error, too high or too low can cause errors. Those voltages are as low as I can get without getting either a Core failure / BSOD. IBT 100 passes Max Memory and Prime95 Custom Blend with 21000 MB of RAM stable for 16 hours straight.
The max safe vCore & QPI voltages I have read is approximately 1.40v. However, most enthusiasts agree going over 1.400v on QPI causes errors, and does not aid overclock. Now on the vCore, error town (without sub-zero) begins appearing around 1.59~1.60v, thus making your max OC limited to vCore.
Also what are your Uncore/Northbridge & QPI frequencies? Having a stock Uncore can hold back your benchmarking. QPI should be set to around 3.5 GHz and if you don't have direct control over that, have to adjust Bclk and lower CPU multiplier. Its more complicated I know but worth it. If you scroll down the EVGA's hall of fame
, you can see I am in 4th place on 3DMark11 for 2x GPUs, but its primarily due to a boost from my Combo score at the end, nearly a 1000 higher, just from raising my Uncore to a stable 3.6 GHz as well. It increases system intercommunication greatly. In addition to that, I have added a small boost to my IOH Core voltage, which has been shown to increase the performance of multiple card / multi GPU setups. I run that at approximately from 1.100v to 1.225v, not sure what the live voltages are but I assume it doesn't go much higher or lower. 0.060v for every GPU