I used a huge case for this so I could get enough airflow and room for all my drives, etc. It's a Supermicro full tower server case with a 300W power supply. The mobo is the dual socket 370 Abit BP6. I grabbed a couple of Celeron 366s and threw them in, and added a couple of Alpha heat sinks with some thermal grease to help. It seems to keep it cool enough and they run stable at 550MHz each. I've also got an Asus V6800 Geforce DDR video card in there that I've got overclocked to 152MHz using the standard HS/fan. With my 2 CD-ROMs and 3 HDs it stays cool using a HD cooling fan and 3 other case fans set up to keep air flowing in the front and sides of the case and out the back. My friends say it sounds like a refrigerator, but I don't mind as long as I get my speed :) It's somewhat annoying to bring to LAN parties because of the case size, but I just ordered a carrying strap from thinkgeek.com that should make it easier to carry.