Came across these if anyone else is interested -
INTEL cpu diagnostics (x32 and x64 version) for Linux
http://www.tcsscreening.com/files/users/IPDT_LiveUSB/index.html
linked from the Intel windoze site https://downloadcenter.intel.com/download/19792/Intel-Processor-Diagnostic-Tool
Uses Fedora 25 - am trying out the Xfce Fed25 penguin while I am at it.
Linux benchmarking tools -
https://www.phoronix-test-suite.com/
https://www.phoronix-test-suite.com/?k=downloads
Apologies. Wrong forum sorry Dingo - didn't notice it changed after I logged on.
[cheers]