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Don't have another vid card, unfortunately. All my others are in use.
Here's what's interesting. My ram was (after the upgrade): a 128, a 512, and a 512, in sockets 1, 2, and 3.
I sort of guessed, given how fast the machine was rebooting itself, that it was getting into Socket 2 before finding the error, but not Socket 3 (taking a wild flyer that RAM is addressed numerically up the sockets). I yanked the 512 DIMM in Socket 2. The machine was fairly stable as I downloaded memtest86 and a freeware cd burning package (this is a relatively new install, which didn't have any such utility installed yet). I burned memtest86, rebooted into it, and watched as it tested my 640mb of memory.
Halfway through one pass it was testing clean, but I wanted a control test, so I powered down, reinstalled the 512 in Socket 2, and booted back into memtest86.
Bloodbath. By the time it was done with one pass there were HUNDREDS of errors between 128.1mb and 630.0mb. Hundreds.
I yanked that middle DIMM again and ran memtest86 again (leaving home for a halloween party, leaving it running for several hours). When I came home it was on pass number 6, with zero errors.
Tomorrow morning, that middle 512 DIMM is going back for a refund. 640 should be an ample plenty to run this machine with--in fact, its performance is quite good right as I type on it. I'll look and see if we crash again, but I suspect I've at least narrowed down on my problem.
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