As of today there are no official Aftermarket cooling alternatives (as I know of) for HD5XXX but most of the old ones do fit the HD5XXX cards since HD5XXX:s have the same slots for the cooler. I have got an Accelero S1 Rev2, which does actually fit the HD5850 with a little modification (had to turn/cut some fins to avoid them touching the DVI-connector). What I'm anxious about is VRM cooling. I have no proper heatsink or else for that. Can i use Thermalright VRM-R1/R2 for HD5850?