I've measured it out and i have approximatly 89 mm between my power supply and mobo. I've got the Epox 8KTA+ with a Duron 750@800. The case is an Genica ATX 6-Bay Mid-Tower(http://www.compgeeks.com/details.asp?invtid=205-4260) The problem is the way the mobo and case are, the Cpu is directly under the power supply. So with the cpu in and the factory heatsink on(about 55mm), i've got an extra 30-35 mm's of space. I plane on overclocking my system more but obviously need a better heatsink and fan. However i need to leave some space between the cpu and PS for a little airflow. So what would be a good heatsink and fan for my system?? BTW its a socket cpu.