I would really suggest getting together a few more quid (quid right?) and at least get a 7750. You can crossoff the 4850, it way outdated. And I don't know what so many people in UK buy video cards from ebay, but that usually that last place I look here (USA). BTW, care to share the brand and model of that PSU? not that it really matter with these low end cards, but just to make sure.