I have the 2010 27" iMac, i7, 8 GB RAM, 1 GB 5750, etc., etc. A couple months ago I installed Windows 7, it recognized my card as a 5850, I edited the MSI Afterburner file, and I could overclock it. Since then I installed Lion on a partition and for some reason I could no longer boot into Windows. So I wiped the Windows and Lion partitions, installed Windows 7 w/ SP1, and now my card is recognized as a 5750 instead of a 5850. Apparently MSI Afterburner has changed a little too as the code was different, but I assume that the lines: [ATIADLHAL] UnofficialOverclockingEULA = UnofficialOverclockingMode = 0 AccessibilityCheckingPeriod = 0 Should be: [ATIADLHAL] UnofficialOverclockingEULA = 1 UnofficialOverclockingMode = 1 AccessibilityCheckingPeriod = 1 Unfortunately MSI Afterburner is still showing it as a 5750, which doesn't bother me, but I can't overclock anything. What am I doing wrong, or what do I need to do so that I can overclock this? Thank you in advance.