Hello sparcguy & reborg,
Thanks for ur valuable comments,
while searching on net I found that this IDProm is located on IO board of v880. So now my question is
If host ID is programmed in IDProm and this IDProm is located on I/O Board, then should host ID change with change of Motherboard (P/N 501-4300)??
What you experts say on this point?

I found the above info on following sun page
Sun Fire V880 - Full Components List

Thanks in advance...