I'm back from this weekend's travels and running memtest-86. So far it's found one error, at address 148.8 mb, which would be into one of the new 512 sticks. But it's only 21% done. I'll likely need help interpreting its results...
To get the thing burned, I pulled one of the memory sticks at random--figuring if one was bad, I'd have a 50-50 shot at guessing the right one--then downloaded and burned memtest86. Thing seemed pretty solid while I was doing that. And I suspect that the error I just saw was in the stick I pulled--a 512 stick from the middle socket.
Still, though, Windows is clearly reporting an error about the video driver. I just pulled and re-seated the vid card. It seemed pretty firmly seated before, and I'm quite confident of it now. No on-board video on this MB, sadly.
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