Upgrade for older system

[famas]

Hey all

I gave my old computer to a friend.

He's a very occasional gamer but does like to jump in and play newer stuff with us from time to time.

He only ever uses the pc to play games the rest of the time he's on his laptop.

He's finding the pc is a bit slow with newer games and has to reduce the settings right down for them to be playable.

If possible he'd like a cheap upgrade that would see newer games run a bit more smoothly.

From what I can find the specs are roughly

Asus M4A785TD-V Evo AMD 785G
4GB G.Skill Ripjaw 1600MHz
AMD Phenom II X2 Dual Core 550 3.10GHz Black Edition
OCZ ModXStream Pro 500w
XFX ATI Radeon HD 5750 512MB
Asus Xonar DS 7.1 PCI Sound Card

I see you can get a phenom II x4 secondhand for around £50 or even a x6 for a bit more, is it worth upgrading the cpu as well as the graphics card, or is it better to put more money into the graphics card.
Unfortunately the x2 didn't unlock any more cores.

I'm not sure on his budget but lets say £100 as a absolute maximum.

What would you guys recommend?

cheers.

 

[famas]

Cheers for the help guys.

I'll keep a look out for a 7850.

If he did decide to upgrade the cpu as well would it be worth getting a x6, or better off getting a higher clocked x4?

Another friend has a 7990 SLI set up and said he could try one of his 7990 as he's thinking of upgrading but I think the x2 would massively bottleneck it?