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

[CryptiK]

Is this true for the P45 also. From experimentation (system specs below). I was able to get stable at FSB 425 with vNB 1.28 and then drop one step to 1.27 by changing NB GTL to +30 from auto (aiming for about 0.67) and at 450 to drop again from 1.29 to 1.27 by going to +40 from +30. Each time I was stable (8h OCCT RAM) at the higher vNB and not at one step down, which became stable by altering the GTL up - whereas most posts here seem to suggest 0.58-0.6 is ideal GTL target for NB - which as I understand it would require a negative GTL offset as the default on this board is 0.64.

CPU is on auto/-40/auto/-40 aiming for 0.63 on all.

Confused!!

Andy

I think all boards do follow that general rule, as they all use clockgens which have preferred frequency multiples they produce from the base frequency of 33.33MHz. However if this thread has shown one thing, it's that GTL Ref requirements follow a general trend for each chip type (including the NB chips) but each individual chip differs, meaning you need to experiment and find exactly what your chip likes.

My NB on my M2F does not like anything over or under 0.64x, I lose stability if I change it from that. It appears yours behaves differently, and perhaps the fact you are running a quad alters its behaviour.

Per the manual.

�� GTLVREF Lane 0
This function defines the voltage level for GTLVREF Lane 0. Use the Page
Up and Page Down keys to select a voltage or select [Auto]to automatically
set the voltage.
�� GTLVREF Lane 1
This function defines the voltage level for GTLVREF Lane 1. Use the Page
Up and Page Down keys to select a voltage or select [Auto]to automatically
set the voltage.
�� GTLVREF Lane 2
This function defines the voltage level for GTLVREF Lane 2. Use the Page
Up and Page Down keys to select a voltage or select [Auto]to automatically
set the voltage.
�� GTLVREF Lane 3
This function defines the voltage level for GTLVREF Lane 3. Use the Page
Up and Page Down keys to select a voltage or select [Auto]to automatically
set the voltage.

Not specific enough (not your fault its the manuals lack of info). You're going to have to do this blind. Try setting +50mv for all four of them. However when testing CPU GTL Ref settings you must be absolutely certain your ram & NB are stable, otherwise you will have no idea where errors are coming from if they occur.

what does it mean when you can game, and do everything on your PC perfectly fine at say 4.2 ghz. can run 100 back to back cinebenchR10 quad core. but as soon as I launch prime 95, and start the torture test my computer BSOD's and reboots?

like, thats not the CPU failing is it? Is that a sign that more voltage is needed, the FSB is too high, bad memory, or what?

Fail small FFT's = usually CPU (but can be ram/board if theyre very unstable)

Fail Large FFT's = usually ram/MCH unstable

Can you pass linpack? That is quite cpu oriented also. If you fail small FFT's, increase vcore or vFSB, tweak your GTL Ref's, or lower your cpu clock. if you fail large FFT's, increase vdimm or vNB, alter your timings, or lower your ram clock.