Hmmm. Thanks for the replies. I forgot to say what the PC was:
- Enlight EN-7230 case with included 230W PSU
- PIII 500 (S1) with Cooler Master HSF
- QDI Brillianx mobo
- 128 x 3 sticks
- Creative 6x DVD-ROM
- Quantum LCT20 20Gb HDD
- FDD
- Sound Blaster Live! Platinum with Live! Drive IR
- Geforce 2MX 32MB AGP
- Netgear FA311 PCI
As you ca see, everything bar the processor and the PSU is already passively cooled. I have also discovered an additional cause for extra noise - an intake fan at the front (didn't spot it... doh!). However I'll take the advice for the Enermax silent PSU's - they look good. Is there a HSF or just the fan which I could use from a Cooler Master product (it's just that they are easy to get hold of) I could use in place of the current one which clatters a bit?
As coincidence would have it, the Windows on this beastie has just died (invalid page fault in explorer.exe? WTF? I didn't do anything... except install a Sidewinder Dual Strike controller. Now I even get the same error in safe mode!!! arrgh). Looks like an ideal time to overhaul the PC build and reinstall Windows!
Could a new case help matters?