More Evidence :

Comparison from Hardwareheaven.com 6990 OC vs gtx 590 OC review:

CPU: intel i7 990x @ 4.53 Ghz

GPU: AMD 6990 @ 945/1350 Mhz or Nvidia GTX 590 @ 705/957 Mhz

AMD 6990 OC:

Score --- X3563 

This score is less than my stock (880/1250) 6990 scores where the FX 8150 @4.8 Ghz

Nvidia gtx 590 OC:

Score ---X3359 

My Stock Score:

CPU: AMD FX 8150 @ 4.8 Ghz

GPU: AMD 6990 @ 880/1250 Mhz 

The numbers speak for themselves! 


Link:



http://www.hardwareheaven.com/reviews/1140/pg5/point-of-view-nvidia-geforce-gtx-590-oc-vs-radeon-6990-oc-3dmark-11-heaven-benchmark.html