OK, now I'm lost again. I tested all 4 sticks in the 3rd slot and all passed. I putt all 4 in and tested. passed once then locked up. I have now been running for about 30 hours with a pair of dual channel 1 gig sticks in slots 2 and 4 plus half a dual channel kit in slot 1 (3 gigs total).
I installed 1.9-64 on the 74gig drive with all the drives plugged in and it went well, or so I thought. After restarting, I was unable to access any OS from Grub. The new 1.9-64 install said"NTDLDR is missing", 1.7 and XP ssaid "Error 17 : Cannot mount selected partition", and XP-64 said "Error 13 : Invalid or unsupported execytable format:
I zero filled the 2 older drives and removed them. Then installed XP on the 320gb drive in a 20gig partition and I'm in the process of installing 1.9 on the rest. When it is done, I will plug the 74gb 10,000RPM drive back in to install XP-64 and 1.9-64 and see how things go from there.