There are (actually) several "issues" with both boards. The Shuttle has voltage regulation trouble, as well as problems when all 4 DIMM slots are populated. I can confirm these issues firsthand, both on the AK31A I have in-house and the few others I've worked with in the last 2 weeks. They work well, but they do have issues. As for the 8KHA+, people are reporting a slew of trouble -- from the infamous "NO POST!!" to spontaneous reboots and the like which could mean voltage regulation issues ala 8K7A. Right now, none of the KT266A boards are reliable enough (IMHO) to purchase. You're far better off with either AMD761-based boards (KG7, 8K7A, et al) or SiS 735. And SiS 745 is just around the corner.