I don't notice the CPU usage at all either. the most I was able to pick up wis 65% total usage.....I've determined, my-self, that it was my GPU. I run it at 60 with minor traffic 50 medium traffic and 30-40 in all out battles. But it looks as though 680's, are having problems so i'm at a loss.
My CPU doesn't heat up all that much either. The Witcher 2 gets it about 7* hotter(max temp) than this game and I run that at 50-60/1080p max (uber off).
CPU:AMD 8350 8 core @ 4.4(O.C.)||Cooler:Cooler Master Hyper 212 EVO
GPU:Sapphire 7870 XT (Tahiti)+Sapphire 7950||Harddrive:500GB Hitachi 7200 RPM, 120 GB Plextor SSD
Ram:2x4GB PNY @ 1600Mhz||PSU:OCZ 750w-ZT series||MoBo:Asus m5a97 le 2.0||O.S.:Windows 8.1 64
Case:Thermaltake V3 Black Edition||Screen:40" LCD-RCA