Problem adding 2nd CPU to DL380 G4

[ynotravid]

I have recently swapped CPU's between 2 of my servers.

The first is a DL380 G3 with 2 CPUs (3.2GHz 1MB cache)

The second is a DL380 G4 with 1 CPU (3.4GHz 2MB cache).

The G3 will run with one or two of either kind of processor but the G4 will only run with 1 CPU and that's only if I use the original PPM module that it came with. Otherwise it will not POST.

Does anyone know why would I be able to use any combination of CPUs with the G3 and not the G4?

Any input would be greatly appreciated. Thank you.

[HP_Sammy · Accepted solution]

Hello ynotravid,

Buddy part no for PPM

DL380 G3 is 289564-001
DL380 G4 is 347884-001

Which i think manufacturers are different so thats 1 point

2nd is need to follow some guidelines when we mixing procs as follows :

1.System bios should me msot latest
2.Procs Steppings shuld be same
3.Lowest stepping proc should be installed as the bootstrap processor (processor slot 1).


Cheers :)

[TY 007]

Hello,

>> able to use any combination of CPUs with the G3 and not the G4?

G4 supports only 800MHz FSB

G3 supports both 400Mhz and 533Mhz FSB

800Mhz FSB == 2 x 400Mhz FSB :)

Thanks

[ynotravid]

Guys, thanks for the replies.

It's hard to admit this but my problem was that I was leaving the riser board off, and the machine just wouldn't boot without it.

What really set me back was I just recently read a review on anandtech where they not only took the riser board out but they plugged a video card in the then empty PCIe slot. http://anandtech.com/cpuchipsets/showdoc.aspx?i=3092&p=4

Anyhow, it's all a bit embarrassing but thanks for the quick responses.