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Hi i have played BF3 since release on my GTX 460. i just clock it up to 825/1950 but have been runing it lately on 725hz core with no real ill effects.
I play 1080p and use most high ish settings and am okay. i5 here too.

I just installed it lunchtime and had a quick blast.
Turned off AA etc and it's not bad.
I might drop a couple of settings to medium tonight though.
Dinky little card.
.