I have MadLittlePixels 128 attract mode on mine.. I used it a bit and when i was trying some N64 stuff it locked up.. the heatsink was so hot i couldnt hold my finger on it.. I am brand new to this (Pi) so no idea on heat and such.. but unless i have a bad PI mine seemed to lock up on N64 games.. I have a fan on the way. But i too am concerned. I got mine in a kit from Amazon with everything (case, board, PSU cord)Â so not sure if i need to replace or?