I don't fell there's a huge sound difference and the lifetime warranty is the best on the market.
why a 6990 i run 2 xfx6970's which are faster then a 6690 and cost less also and yea the fan sounds like a jet but not more then any other 6970/6990
well BF3 with Cat 11.10 ultra setting ave 110-130 fps crossfire xfx 6970's
New Cat's working great here XFX6970 crossfire BF3 and rage with max settings