I have a Sun Micro W1100Z with Opteron 150 and was considering replacing CPU with Opteron 170 or 175. Sun were unhelpful to answer this question. I realize there are challenges, as their custom motherboard may not have BIOS support for dual-core CPUs... But OTOH it may support them already (as it's same MB as in W2100z, supporting 2 CPUs). Anybody knows? I bet somebody tried that already
Please share your experiences.