Greetings Mutleyman087,

Sorry for the slow answer. This is the best answer I could get from our engineering department:

Precision T5500 Motherboard Part number CRH6C supports Westmere Intel E56XX | Intel X56XX

Precision T5500 Motherboard Part number WFFGC also supports Westmere Intel E56XX | Intel X56XX

Precision T5500 Motherboard Part number D883F supports Nehalem Intel E55XX | Intel X55XX

In theory (not tested): Westmere should work on the older motherboard as well (D883F) if you are running latest BIOS.

Hi Justin 

Many thanks for your reply.

Installed a pair of Intel Xeon x5550's which are running fine.

Also installed a HD 7870 / 2GB gpu.

This required a slight modification to case but was well worth it.

Happy New Year :--))

Hi,

I have tested the D883F with the latest BIOS and twin X5660's. It has all worked fine.