I currently have the following config
Phenom ii X2 550 BE paired with an ASUS M4A78 EM
OCZ DDR2 800 2x 2gb
Sapphire 4670
Will changing to a 785g chipset based motherboard and DDR3 1066 make a difference to general system performance?? I am not really interested in gaming.
What do you mean by general system performance. For normal usage like browsing, office apps etc, there won't be any difference even if you overclock. But if you do a lot of encoding, photo and video editing, OCing your cpu can give some nice boost. Considering you have a BE cpu, you should be able to overclock it to 3.5K ish, especially with your stock cooler that comes with heat pipes. But you won't see any major improvement in gaming with your GPU.