This would concern me. Though I understand that not everyone WANTS to be a geek, if you're going to go to the trouble of building a machine yourself, you shouldBut i built the computer myself! I never looked twice on the motherboard box though, and i have no idea what it is. I just want to build and forget.
a. know what you are doing
b. research every component - after all, this is why you don't usually want a Dell or whatever to start with - you don't know what components are in it.
c. know what you've purchased and why you chose what you did.
Frankly, if you can't recall what the motherboard was that you put in, there's a fair chance that it wasn't anything special and probably has an obscure chipset or something. Maybe you got lucky with a good name-brand board...
--- edit ---
My mistake - didn't see the updates that it was working. Consider the above advice for future readers
