Are you using registered DDR (Or DDR2) Memory?? Just curious, as I've been using Tyan boards for years, and they are usually quite stable. I have 3 Tiger MPX boards (Yeah, they are quite old now).. And using registered DDR memory on them, and having ECC enabled, they ran quite well.. (Updated them due to their age.. Only 4x AGP, 266MHz FSB, and 100MB IDE). I've had nearly all AGP boards in them from the 3xxx Series boards right up to the 6800Ultras, and they have run without lockups.. Unless Tyan are getting slack with their board design.. (No SLI stuff yet from what can see..