"I was a bench tech for several years, experienced in using and teaching Milspec procedures and techniques, have 2 engineering degrees, and my own IT consulting firm."
It is very hard to understand why someone with this background would have 6 systems fail, and not be interested in figuring out why they failed, but rather just jump to the conclusion that the motherboard is garbage.
It is very obvious to any rational person who looks at the number of vendors who have been selling the ECS K7S5A for several months, that there must be tens of thousands of them that work fine. Companies like Newegg wouldn't keep selling them if they had overly high return rates.
I've put together 2 systems based on the K7S5A, both work fine; I've also put together 2 systems using Ak31's, one worked fine, the other stopped working after a week.
What conclusion do I draw from this ? None, because the sample size is much too small to be meaningful, and I would say that your conclusion about the K7S5A is also meritless, given the small number involved and no explanation that I've noticed of what was wrong, other than the motherboard must be garbage.
Your actions are more like a "parts swapper" than someone with two engineering degrees.
For instance, based on your comments I assume you were building the 6 system for others, before you sell systems don't you bother to assemble a test unit to evaluate component compatibility, reliability, and performance ?
BTW, I think it was azgamer who made a reference to generic power supplies and the K7S5A, I used generic power supplies in the 2 K7S5As I mentioned above and didn't have any problems, but as I mentioned before this information isn't worth much since I only built 2 systems.