Currently I using a gtx 460 (768mb) graphics card and I've found it's just not keeping up with the games I'm playing at the settings I want... I am thinking about going sli but I would need a new psu which would set me back £70 not forgetting £100 for an extra graphics card. So my question is would it be better to do the above or to buy something like a gtx 560 for £150 and sell my current graphics card?
AMD Phenom X4 CPU
Windows 7 32 bit
That it's not keeping up is probably partially because the vram, so sli-ing wouldn't help much. Going from a 460 to a 560 ( non ti ) isn't much of an upgrade, you really should go for a 560ti / 6870 / 6950 if you wanne get more performance.