PA-8800 and PA-8900 in the same machine?

[Janne_5]

Need to upgrade with additional cpu and found a spare but it's not the same type.

Do you know if it is supported to run 1GHz PA-8800 and PA-8900 cpu's in a rp4400 at the same time?

[Torsten. · Accepted solution]

Not supported.

[cnb]

Use the Qucikspec, Service Guide or Partsurfer to find the correct CPU option and procedures for your system:

http://h18000.www1.hp.com/products/quickspecs/12034_div/12034_div.HTML

http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01404131/c01404131.pdf

Rgds,

[Robert_Jewell]

And here's another little tidbit:

If you install the PA-8900 in this server type, the system firmware will "flip a bit" to address the PA-8900 CPU type. Things will work fine. However, you cannot just go back and install the PA-8800 CPU if you need to as this "bit flip" is persistant and the system will not boot up due to the now incompatible CPU.

-Bob

[Torsten.]

Yes Robert, I think I remember this. Once PA8900 CPUs are installed, you cannot "go back" to PA8800 so easily.

However, it is still a fact you cannot mix the CPUs.

[Janne Paul]

Interesting... That was good to know as one of my options was to shift cpu:s between machines. But that's not possible anymore when I know PA8800 will not work in the original PA8900 machine.
Thanks Bob!