Also, the base clock (reference clock) is something entirely different than the FSB. The FSB is the frequency of the system bus (front-side bus) which is then quad-pumped to get the system bus frequency (which is also the path to memory), and then multiplied by x to get the CPU frequency. Matching it to memory frequency by some sort is beneficiary because memory traffic passes over the FSB.
'BCLK' is the reference clock for the Nehalem, 133MHz, a reference clock for all the various components. The system bus (QPI link), the uncore (L3 and integrated memory controller) and each CPU core all have their own multipliers of this 133MHz figure. 'Matching' the 133MHz number or the QPI link to memory is pointless because they are now decoupled. Memory traffic goes over the dedicated integrated memory controller, not via the system bus from the chipset.
Where to start.. Well, if you want a guide you could just find an AMD guide, preferably Phenom as it is most similar and replace the terms with Intel terms. (HyperTransport link -> QPI link, HTT/FSB/reference clock -> base clock/BCLK, 200MHz -> 133MHz, etc etc) No, really.
But, very quickly...
1: Set the QPI, memory and uncore at their lowest possible setting.
2: Set all the voltages at their standard, but fixed setting rather than Auto. Auto may cause the motherboard to give your CPU some unnecessarily high voltages.
3: Start by increasing the base clock by a modest figure, if you're patient 10MHz at a time, if you're not (like me) more.
4: Stress test a few minutes for each increment until you get a failure. Note your highest possible clock at that voltage setting, then ramp up the voltage (CPU voltage) a notch or two. Continue testing until it fails again, make notes, rinse, repeat until you're either happy with the OC or your temperatures or voltage get too high for comfort. Temps and volts are all very personal things, some people are uncomfortable with more than 60C and more than 1.35V, others are happy if they're below 90C and below 1.5V. You'll just have to search, read and decide for yourself but obviously if it's your first its best to be careful.
5: You can also try the various voodoo settings they have, load line calibration, spread spectrum, clock skew and whatnot. I know my ASUS has five, six, seven, not sure what settings below everything else and I have no idea what they are but they work for me at least!
Also, could you add your machine to your profile so we can help more specifically?Edited by bowman - 12/27/08 at 5:26am