Yes gaming has more to do with your GPU than CPU's.
Nice job man !

I suspect some games might struggle with older CPU's and perhaps the chipset on the motherboard used.
From my experience with my 5960x, 1080gtx system and moving to a dual E5-2699 v3 platform with same GPU I saw no difference at all in game play so its not really a matter of CPU speed also. Only game that would not work was GTA V as it seems to not be NUMA aware. I did figure out a fix for it and it runs very nice.

I have a friend running a 990x system I built for him long ago and its still running like a champ, its a beast of a rig even by todays standards.