SiS 735 supports DDMA, so shouldn't that work with the Solo too?
1GHz Duron is pretty fast so you might need to employ some slowdown methods for many older games.
"Unknown" board with that chipset sounds suspiciously like an ECS K7S5A / PC Chips M830. The former has a black/brown PCB, the latter a red one, but they are technically the same board.
Two things to watch out for with that board:
- early BIOS revisions were badly buggy (as in: data corruption issues). I would hope all boards would have been upgraded (or thrown out) by now, but double-check once you are sure about which board it is.
- the 2002-era was peak capacitor plague time and these boards were by no means exempt. Assume all caps to be suspect unless proved otherwise (i.e. already replaced with good quality ones). In case of stability issues, check caps first of all.