I have i7 processor of the same generation coupled with less RAM and a GTX 675M (as far as I've heard, it's refurbished GTX 580M) and, for example, Witcher 2 is playable at highest settings where only über-sampling is disabled.
Sleeping Dogs have the highest settings pumped in, maybe some degrees lowered in AA, that's all and it's playing well too.
I suspect your power management profile is restraining your rig to perform at its peak. You have to check those settings and choose the one that requires most power, hence yielding the highest performance.
Happy gaming with your monsta.
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