u remind me of myself when i was a noobie @@... well, firstly set the multiplier u wanna use (QX6800 ranges from 6~31)...

look at your bus speed... by default it should be 266, hence stock clock for QX6800 is 266x11 = 2.93ghz

to increase ur clock, u can either:

1. increase the bus speed
2. increase the multiplier

for bus speed, for example, if u put 300, it will be 300x11 = 3.3ghz
for multiplier, for example, if u put 12, it will be 266x12 = 3.19ghz

when you oc your bus speed, few things will be oc'ed as well... ram, and your fsb... lets say u put 300, ur fsb will be 300x4 (fsb is quad pumped) = 1200fsb, and your ram, depending on your multiplier, for this case lets use 1:1, will be 300x2 = 600mhz...

regarding voltage, it depends on your proc's capability... u might be able to hit 3.2ghz on stock vcore... but if u find it unstable, u have to add vcore, assuming you are very sure that the processor is the culprit for instability

hope this helps

its the same... just that, ur qx6800 is alot easier to oc cos of its unlocked multiplier