FPS Drop

[FrostByte_99]

Hello,
could someone tell me if changing motherboard affects on gaming fps, cuz i just bought new cpu gpu and psu and i used old motherboard which said it wasn't even compatible with the cpu i had but still ran very smooth, but then i switched to a new motherboard and suddenly my games give very big lag spikes or lag constant like Far cry 3 and Skyrim.
Specs:
GPU: XFX Radeon HD 7850
CPU: Phenom II x4 965 BE
PSU: 600W
RAM: 4GB <-- I could upgrade but it shouldn't be causing the lag
So if anyone could tell me what is causing the lagginess with the new motherboard <-- It is K9A2-CF If anyone interested

 

[tiny voices]

That motherboard (K9A2-CF) Shouldn't work with your CPU. Your CPu is an AM3 socket and the motherboard is AM2/AM2+. I would guess that the motherboard is limiting your CPU in some way or ways. (disabling cores and lowering clock speed)

 

[FrostByte_99]

But don't AM2+ support AM3 processors ? i thought it was like that

 

[FrostByte_99]

And the box says AM3 CPU Ready and AMD Phenom II x4 Ready, also it's 125w cpu support