About a year ago i got a fully functional HP Proliant DL380 G5 with one CPU Intel Xeon E5420 (4x 2,5GHz) I had VMWARE ESXI installed, everything went perfect. I bought a extra CPU, another E5420 @ 2,5GHz on eBay. I plugged it in, and started ESXI. Purpel Crash Screen. Error code belongs to a Hardware Error. I tought i have to reinstall ESXI. Some time later, i picked up my Server again, and wanted to install ESXI. Purpel Screen, same error. Then i wanted to install Windows Server, crash. Then i have installed Debian, everything works (Dual CPU). I have unplugged Proc 2 and i installed ESXI, its working, Windows Server too.
So why ESXI and Windows Server crashed at 2 CPUs? Is the CPU broken? Should i buy 1 new CPU? But why is Debian working with dual CPU?
Random fact: If i install one CPU, install Windows Server, and set the Processors to 4 (1 CPU) and plug the second Processor in, Windows starts and Device Manager shows 8 CPUs @ 2,5GHz. But if i start without msconfig processor limitation, crash. I have activated Windows, and switched CPUs.