You would be wrong there... I played Shadow of Morodor on my Pentium E6300 2.8Ghz NOT OC'ed, and it ran at 30+ frames. Since then I have upgraded to a Q9550S which is currently being backed up by my R9 270X ASUS TOP 2GB - and I am running witcher 3 with an overclock to 3.6GHz yet my temps are doing very well, staying under 50C when playing and under 30C when "Idle".
My RIG:
Asus P5K Deluxe - Motherboard
4GB Kingston HyperX(2GB per card) - RAM 1066MHz
ASUS R9 270X DIRECT CU TOP 2GB - GPU
Intel Core 2 Quad Q9550S - CPU
Samurai Zz Rev.B - CPU Cooler
LC600H12 V2.31 - PSU
Enjoying Witcher 3 on High setting right now(yes even in huge towns) - my rating is "9/10 nothing is perfect - but that doesn't mean it's not fun"