I just installed a i7-4790K and a Gigabyte H97M-D3H but now my graphics are really slow whenever I play a game. I am lucky to even get 20 FPS. I have a Radeon 7850 installed.
You've probably done this, but to make sure,
You downloaded the AMD/ATI Graphics Driver & went to Gigabytes web site to make sure you have the latest mobo drivers?