> Since this is my first time running a SX52 at 50MHz, I don't > really know - how hot does it regularly run? Mine is more than > a bit warm, and I don't know whether or not to be concerned. SX do run quite warmish. The first time I put a couple of SX18s on a board the un-heatsunk 7805 got red-hot. Something you'd never even normally bother to check with PICs -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.