I checked the stress on both my CPU and GPU two times today, (Both with nothing running in the background except Windows processes and Steam).
Sins: Rebellion, on all highest possible settings used about 10% of my graphics card, except when I zoomed in on massive battles.(in which case it would jump to around 30%)
While playing Sins, my processor never made more than 40% total usage.
Civilization V: On all the highest settings, it used around 70-80% of my GPU most of the time, and almost 60% of my CPU.
I dont even....