How to set up GTL Ref Values for 45nm & 65nm

[Cibic]

I don't recommend actually calculating NB GTL Ref. You need to find through trial and error what gives the most stable results. Leave it auto to begin with, and see how you go. I tested my NB GTL Ref from -100mv to +100mv and found my sweet spot at 445 FSB on 5:6 divider was -60mv, and at 478 FSB on 5:6 divider was -40mv. Other guys with the same board as me require different NB GTL Ref settings for stability, some cant even boot on my settings.

It's important you experiment with your board and find exactly what it likes at a given FSB/clock/memory speed etc.

There is no specific rule that defines what causes what kind of error, it could be anything, ram timings, vcore, Vtt, vdimm, vNB etc. Try to isolate specific items like cpu, ram, NB and try to stress each one to find the problem.

The fact you pass 8hours of small FFT's but fail blend to me indicates a ram/NB instability. Try playing with NB GTL's as I suggested above, and also adjust your ram timings/vdimm. You may also need to experiment with clock skews on ram if you have them.

When I said calculated I meant (VTT x 0.667) - (VTT x 0.635) = 0.046 for me to use on my CPU.
Isn't the NB the same? Anyway used -46 on NB for now (I'm guessing I should go lower, upper means more unstable) and testing CPU again small fft. Ram is fine because I tested it a few days ago, its running on stock frequency, volts and timings.
Its hard to believe the cpu has been stable at 3.8 with 1.54v at 1800 fsb small fft's (q6600 G0, 1.26vid) but blend has been unstable even at 2.4(stock)/2.8/3.0/3.2/3.6 GHz