Here is what I have tried so far with my problem, (keep in mind I have high FPS during the stuttering).
CPU: PHenom II 6x 1090T
RAM: 4x4 = 16GB DDR3 XMS3 Corsair RAM
GPU: HD 7870 GHZ edition
MOBO: Gigabyte 970A-UD3
SSD: Kingston Hyper X 3k 240GB
Ran numerous tested including Memtest with no errros. Clean Install and all that jazz.
I swapped out all 4 RAM sticks for a 3 set from HTPC, plugged in and had no problem. So started testing out RAM. put original RAM back in 1 and 3 slot only, tested fine. Then tested 2 and 4, ended up with choppiness. Tested both sticks of RAM in slot 2 with no problem.
Meant something going on with slot 4 on the MOBO side.
Decided to test out old video card, 6870 and plugged all four Sticks of RAM into slots. Played for a while without having an issue.
\Going to through my new 7870 into the HTPC and test if there is stuttering. If it stutters it will mean that the GPU is the issue, if not then the MOBO isnt transferring Memory correctly for some reason. Faulty Board.
If it doesnt stutter on HTPC I will also try it in second PCI-e slot to see if it has something to do with PCI-e slot 1.
I can only assume since my 6870 is working fine in the 1st PCI-e slot then there wouldnt be an issue with the MOBO with All four RAM slots filled.
So its a funny conundrum. Could be GPU or could be MOBO, but MOBO works fine with older GPU, but not newer (power draw issue maybe?). Depends on tonights testing. Failing memory in GPU maybe.
Im thinking its more of a hardware issue in line with my problem than software, since all drivers are updated, even the BIOS. and installing older version of these drivers does nothing.
I would think that if it were driver related we would hear a lot more about it and there would be more problems out there to read about.