GTX 560Ti-448 or GTX 650Ti for ageing system?

[Cern]

Due to my GTX 260 dying I need to upgrade my graphics card. My budget can stretch to £140 maximum so the card I'd really like (GTX 660) is sadly out of reach. So I'm trying to decide between:

GTX 560Ti-448: http://www.overclockers.co.uk/showproduct.php?prodid=GX-177-MS&groupid=701&catid=1914&subcat=1854

GTX 650Ti: http://www.overclockers.co.uk/showproduct.php?prodid=GX-180-MS&groupid=701&catid=1914&subcat=2392

My system is likely to be CPU bottlenecked. It's an old Q6600 system with 8GB ram, Asus P5Q Pro, WD Caviar Black drives, Win 7 and dual monitors - 2 x 1600x1200 (so I need a card with two DVI connectors).

I don't really want to upgrade my whole computer at the moment (I'm holding out until Haswell) so just need a graphics card which will be good now but also usable in a future system.

I mostly play MMOs like Guild Wars 2 and The Secret World, plus third person shooters like Mass Effect 3 and Deus Ex:HR. I play Windowed fullscreen at 1600x1200 usually.

Which of the cards I've listed would perform better with my system do you think?

 

[arc@css]

Overclock your cpu if you can.

How about this :

http://www.overclockers.co.uk/showproduct.php?prodid=GX-100-GI&groupid=701&catid=56&subcat=411


Curse my eyes. I've just noticed your max budget...

In that case, the 560ti 448 would be a bit faster than the 650ti.

 

[Gregster]

+1 for the 7850 if you can push your budget. If not then also the 560TI 448 edition will work well

 

[Cern]

I'm not wanting to overclock my CPU as my PC has possible heat issues. My GTX 260 died because it wasn't spinning up its fan properly during certain games and seems to have cooked itself. I'm not sure if this has caused any issues for the motherboard. The motherboard and RAM check out ok, but I don't want to stress anything further with overclocking.

A 7850 isn't any good to me because all the ones I've looked at only have one DVI slot. I run dual monitors and they need DVI (they don't have HDMI).

 

[Nuclear Fusion]

A HDMI to DVI adapter will cost about £1-2. So not really a concern with regards to the 7850.

 

[Cern]

Hadn't considered the HDMI-DVI adaptor, thanks for suggesting.

Since heat is something I want to try and keep to a minimum in my system, which would run cooler under load, a GTX 650Ti, GTX 560Ti-448 or HD7850?