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Sold mine a few month's ago mainly because of not being able to get a waterblock that would fit it.
Do standard gpu only blocks not fit them? Used to run my 4850 (similar power use) with one, with custom made vrm sinks (chopped up socket 7 heatsink), normal ram skinks and a near silent spotfan.
I dont see the point of a £60+ waterblock on a £120 card. Reusable standard GPU block and reusable ram sinks for that sort of mid range power card.