[idi banashapan]

you'll get what you pay for imo. if you have £100 to spend, try to spend it. get the best you can for that price - preferably a DX11 compatible (ATI 5xxx series is, but not the 4xxx series) card such as the ATI 5750 which you can get for about £100, give or take £5. the 4850 will not be DX11 compatible. you want the DX11 just to futureproof yourself. if you keep this card for as long as the 7900GS (which is mighty old in GPU land), I would totally recommend you go DX11 unless you have no plans in the next 5 years to move away from XP, in which case, it doesn't matter.