Hi john.
List the brand of motherboard you used for the new build and it`s model number.
Including what cpu brand you used and the model number.
Also what Graphics card brand and the model of card you are running.
The brand of memory, it`s speed and the type.
And if you installed a clean fresh version of the OS when you fitted the new motherboard and cpu.
What sort of frame rates you are getting from games and the resolution the display, monitor is set too.