[Real_Bullet]

Currently running 4 gigs of DDR2 667 Ram.

Is their a huge performance increase i running a higher ram say DDR2 800 or higher?

 

[hhnq04]

It would be a negligible increase, you wouldn't even know you did it.

 

[Tyree]

Probably not anything noticeable.
PC Specs?
Prebuilt- Brand & Model Number.
Custom Build- Brand & Model of Mobo-CPU-Hdd-RAM-GPU-PSU.