Mine's on 24/7 because i have a ftp server (which is always on tho) and i dl and upload allot of s*** during the nights... I have a p450 slot 1 with one of them **** boxes around it its the best i could get then the time, but it has a problem with heat i have 2 fans pointing to the processor and another one just to keep it cool around then i have 2 more to cool my SCSI hardrive which gets so hot i cant even touch it. And i removed the case off it, well atleast the sides and top, else it gets to hot. No my CPU temp is usually around 36c (100F).