I know they get hot, but hot enough to ignite? This computer will only be on for monitored periods, never overnight or for days at a time. I was thinking I could drill holes in the board for airflow, and of course have spacers from the board at about 2'', in the locations of the screw holes. Specifically this ASROCK Motherboard For AMD Model K7-VM2 and an Athlon xp 2200+. Thanks! (if you are wondering this is to be mounted in an arcade MAME cabinet.)