guys how to I overclock my video card on this board? sorry for the nab question

. Where do I bump up the voltage for the video card? I see 2 PCI-E voltage.
It's weird I can only run my system tested stabilized at 3.8ghz, 200HT, 2800FSB but when I crank up either the CPU or the or the FSB further my system got froze and restarted during Prime95 testing. I tried bumping up 1.425v for CPU and bump to 1.45v for CPU-NB voltage, but not working so well.
I tightened my Obsidian ram from 9-9-9-24 to 7-7-7-20. Maybe that's the problem?! I need to loosen the rams up maybe and test with higher speed? Which one is better gaming performance wise though? higher CPU speed with loose rams or 3.8ghz with tighten rams speed?
Help me with overclocking my video card.

What's the max GPU and memory speed this card can get with its air cooling?
thanks
Edited by Waterox - 12/24/09 at 5:13am