My 2x GTX 460 MSI Cyclones have been having low GPU usage lately, around 20-30% usage on each card. Games I play: CS:GO. MechWarrior: Online, WoW, Red Orchestra 2, Diablo 3, Planetside 2, League of Legends. Getting pretty bad black artifacts too. using the 310.70 Beta drivers.
CPU: AMD Athlon x4 640 (Oc'ed to 3.45ghz)
Ram: 8 Gigs
Motherboard: M4N75TD http://www.asus.com/Motherboards/AMD_AM3/M4N75TD/