I'm having an issue with a new old stock Soyo SY-5SSB. SiS 530 chipset. It's extremely unstable.

Like for example, it'll boot Windows 2003 setup. I can get past partitioning and it starts to copy the files, but it'll either say one of the files it's copying is corrupt or it'll blue screen.

Things I've tried:

- Two different CPUs (K6-2/350 and an Cyrix MII-366GP that both work fine in other systems)
- Different RAM (that all works fine in other systems)
- Underclocking
- Different CD drive (both work in other systems)
- Burned a new CD (both work in other systems)
- Verified voltage, bus freq and multiplier jumpers are set properly for whatever CPU is installed

Any thoughts on where to go next on this one? Anything in the BIOS that I should try to tweak?

EDIT: I just slapped a single 128 MB SDRAM stick in it instead of the 256 MB sticks I've been using. Now it's actually gotten halfway through Windows setup. I'll update with how this ends. It never got anywhere near this far before. The board is supposed to be able to handle 256 MB sticks, up to 3 of them for 768 MB total...

EDIT 2: Still not crashing. I think the culprit may be that all the other SDRAM I was trying was high density. Only one side of the sticks are populated with chips. This board can only handle low density?