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For £100 you're not going to get much of a speed bump. Would suggest you stick with your current card for a while unless you're happy to buy something 2nd hand
As above, looking for a good upgrade from GTX260 216, was a bad buy really this card should have stuck with HD4870, but I'm not wanting to spend much, £100 MAX.
Thanks.
This chart shows how a 5850 compares to a GTX 260 in a few games, also note that the HD 5850 supports DirectX 11.
This isn't a bad jump considering a HD 5850 costs £108 and you should be able to sell your GTX 260 for £45-50.