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If you still have the original 8800GTX cooler, it should still be under warranty.
4890 if you have to buy today, and £130 is all you have.
Why not replace the cooler with the original and RMA it, then when you get the replacement you can sell it on.
Fit the oringal cooler back to it and RMA it to OCUK.
I sent them my dead XFX 8800 GTX that was a year and two months old and they sent me a new shiny GTX 260
it seems that u made up ur mind already. Go for 260...but 4890 is a way faster card. Can be overclocked to 1 ghz where it puts a smackdown on 285
Already suggested that!