I'm currently running my rig in a Codegen mid-tower with factory 350W PSU, 4 opticals, 3 HDs, R9200 AGP, 3 x 256MB DDR, so far it's been "ok", but I've been having more problem lately, and I wonder if perhaps the PSU isn't getting a bit old, or the mobo caps, or something. Had some "infinite loop" errors with the video driver, sometimes hitting the reset switch after XP says it's ok to power-down, causes the monitor to go to sleep, and the system doesn't reset/reboot, and holding in the rest button, I can hear the case fans slow down too. I have to hold the power button in to shutdown. I've also had cold-boot issues. Most of them started with the addition of the ATI R9200 AGP though, and this KT400 chipset is known for some AGP 8x "wierdness", so I dunno. I flashed to the most recent BIOS, and with any versions more recent than the "fix R9600 compatibility issue" engineering change documented, I don't seem to have infinite-loop problems. (Although I do have not-resetting problems.) But those BIOS version also involved changes in LAN BIOS/boot support, which hoses the ability of any of my HDs on my Promise Ultra100 TX2 from being seen under DOS/BIOS, save for the very first one. Strange stuff indeed. I assume that the BIOS possibly changed AGP drive strength settings, or tweaked some chipset regs as a workaround, but that doesn't explain the malfunction of the hard reset button, or the case fans slowing down, so I figure I'll try a better/bigger PSU. I'm right on the edge, as some online PSU calculators put my system at around "360W". Also noticed that my 3-year-old Tripp-Lite 450/500VA / "300/350W" UPS only has a runtime of about a minute and a half, when powering both my system, my 17" NEC CRT, and some aux devices, instead of five, so either I'm sucking up more juice, or the battery is shot (probably likely).
This same CPU/mobo killed the 300W infamous "Deer" brand PSU that I had in my old case within a week of hooking it up. So I figure that the Codegen PSU must be at least a step above the bottom, as far as "generic" PSUs go. It's no Fortron though. It's a tiny bit on the lightweight side, and gets a bit warm while running.