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There is no way i would pay £200 for a GTX 670 now. They go in the MM for £130 second hand and should not be more than £160 brand new.
Have a look at this review of the gigabyte gtx760 windforce 3x oc . it has the same performance as a gtx670 and even beats it in a couple of games. it's the same story in this review. Once overclocked it beats the GTX680. It's hardly a slow card. You could always sell the two games it comes with to recoup some money.
If you could stretch to £236 i would get this Powercolour R9 280x which beats both.
You are right about the being cheaper and the free games part, but not the being faster part...270x is just an higher clocked 7870.No love for AMD?
http://www.overclockers.co.uk/showproduct.php?prodid=GX-093-HS
Faster, cheaper, free games
Same as how the 270x is supposed to be on par with a 7950...but the 7950 pull ahead once properly overclocked. The GTX670 and GTX760 are basically just same GPU but with the GTX760 got more cores disabled. How far are the max overclock for the two cards is down to the silicon lottery (and PCB design)...for every example you can find a GTX760 clocking higher than a random GTX670's overclock, there would be other examples of GTX670s which would clock higher than the GTX760.The two reviews i posted above clearly show that the two overclocked 760's i linked to are on a par with the 670 and even beat it in a couple of games. Yes you can overclock the 670 to get more performance but you can do the same with the 760 which clocks even further in the reviews.
Yep bit of a lottery with overclocking. On my 2 670's one hit 130 core/760 memory. The other could only manage 80 core/600 memory.