Hi!
HD6870 isn't significantly stronger then your gtx560, GTX660/7850 are and I'll suggest nvidia beacause ATI generaly have problems with drivers.
In CloD 79xx owners have problems( lines over the see...) but I'm not shure for 78xx cards.
I have the same system as you but with gtx560 Ti and my CPU is OC to 4.5 GHz
and I maxed out almost everything except trees, buildings, building details.
There is no big difference between 560 and 560 Ti.
Try to OC your CPU, 90% of 2500Ks will go on 4-4.3 GHz without voltage increase.Just shot down turbo and put multi on 40-42.
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