I've tried replacing the DRAM in the studio computer with two sticks of fast DRAM and two sticks of slightly slower DRAM. It's going nowhere fast. I can get it to boot up, but before too long, it freezes. Somewhere in this process, it seems to have crozzled the RAID driver so that the system won't boot to Windows. And it won't recognize the floppy drive which I need to reload the RAID driver.
If this computer were not nailed to its perch, it would fall right over.
I'm heading off to get a new motherboard, processor, and RAM. Then we'll see if there are any other parts that are failing. But I suspect the motherboard is at the root of the problem.