I have had my Athlon 750 running for 5 months without a problem. I use it as my personal server and as sharing my cable internet connection to all my other PC's, as well as my print server. I only had a single 300W power supply with only one additional fan, and that was in the front of the PC for fresh air. I recently upgraded to a Duron 700, overclocked to 900, in an Inwin Q2000 server case with a redundent 300W power supply with the Abit KT7-Raid motherboard. I have two IBM 45Gb drives in a mirror, one Seagate Barracuda II 20Gb as the primary drive, 2 fans in the case, one in front and one in rear, Zip Drive, HP CD-Rewriter, and One Seagate Cheetah 9gb 10000rpm U2w drive for MP3's for Napster. It has been running for 7 days with one lockup due to the ATI video card I was using. I put a 3DFX 3500 AGP card in it and no problems. I also use this computer to run my Quake III Coliseum Server when I am at home with no problems. AMD is much more reliable in my mind.