Some problem
Specs:
i5 2500K @ 4.5Ghz
HD7970 @ 1150/7000Mhz
8Gb ram 1600Mhz
Crucial 64Gb
Win7 x64 SP1

Max settings. Post processing off, 8xAA. Visibility: overall 3800, object 3200, shadow 100 (autodetected). CPU usage around 50% max. First core usage olways 70-80%, other cores 30-40%.
http://www.picase.net/pic/105858