Jeff Gaines wrote:

Start at ark.intel.com and enter the CPU part number.

That's a brilliant resource but it can't find my Xeon E3 1245 V3 sadly.

co-incidentally that's what I have, so I know it's there

https://ark.intel.com/content/www/us/en/ark/products/75462/intel-xeon-processor-e3-1245-v3-8m-cache-3-40-ghz.html