I have the xigamatek HS/Fan mentioned around here alot and only twice did I get temps like yours. The first was because I put TOO much AS5 on, and the second time was after taking my case to a friend's house to copy AoC files and back to my place, one corner of the HS came unlocked. Once I pushed it back in and heard the click, all was well again. Did you disable the smartfan in the bios by chance? I did so it runs 100% all the time and that helps my temps from getting too high I think.