I'm Cosmos from France ! =)
I have on my desktop the same motherboard, a NEC Vl280U. I would like to put change my CPU for a Xeon like you (it seems to be the best CPU without outpass the limit of 95W).
My question is how to update the BIOS before ordering my new cpu on ebay or aliexpress ? There is nothing on the website of NEC, neither on Foxconn's one.
Will I have to do something else after ?
My OS is Ubuntu 17.04 and I am quite a novice in all those things ^^
Thank you for your help =)