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

[CryptiK]

how do i set GTL for a 65nm dual core? when i stress test both core 0 and 1, it consistently fails on core 1 first. in my M2F bios, it shows the following equation for GTL:

core-0: vtt x .635 + item
core-1: vtt x .667 + item

what i don't understand is that since it's a 65nm chip, then shouldn't i change the "Y" value for core-0 to match the .667? in my case, why is core-1 less stable? then do i need to change my core-0 or core-1? my vtt is at 1.37v, so i should set the "Y" value of core-0 should be about +43mV correct?

Being a Q6600, a GTL Ref of around 0.65x should give you optimal results. So reduce the 0.667x and increase the 0.635x.

Sitting on a Rampage Extreme and a E8600. The board has CPU GTL Ref 0,1,2,3

VVT = 1.20

So i calcute this

1.20 x 0.635 = 0,762
1.20 x 0.667 = 0,800

0,762 - 0,800 = 0,038

= ~ -40mV

I´m i on the right track ?

CPU GTL Ref 0 = Auto
CPU GTL Ref 1 = -40mV
CPU GTL Ref 2 = Auto
CPU GTL Ref 3 = -40mV

How can i calculate NB GTL ?

Yep thats fine. I have given some other alternative settings like +10/-30/+10/-30 and others in a previous post so try some other combos too. When I use Vtt ~1.20v my e8400 likes +50/+10/+50/+10 for the GTL's.

I have the MSI P45 Diamond and I cant get it to post at 400FSB. Im using a Q9550.
My BIOS looks like this:
*snip*
I can adjust the CPU GTL and the MCH GTL in small steps and If I have understood this right, I should let it be somewhere between 0,8 and 1,0? I don't have to do the calculation.
I have tried to just adjust the MCH GTL to 0,6369v and then left everything else on auto, that works ok up until about 375FSB. If I want it to boot at 380 I have to change that setting to auto and put a very high vMCH and VTT.
Any ideas what I should set the CPU GTL and MHC GTL to make it boot at 400FSB if that's even possible? I know it's not an extreme motherboard and its a quad, but 400FSB? I'm looking for bench-settings.

Perhaps setting the appropriate vcore and Vtt, (probably around 1.4vcore & 1.3 - 1.4v Vtt for 4GHz) and using around 1.3 - 1.4 vNB (vMCH) then setting GTL's to around 0.75 - 0.85v should work. Leave your NB (MCH) GTL Ref around the 0.64x Vtt mark.

Which GTL Ref adjustment should I use on my M2F with q6600?
+ or - ond how much mV on 0,1,2,3 ?

This depends on your Vtt, have a read through the thread and get an understanding of the relationship between the GTL's and Vtt (vFSB).

I'm with P5E-Deluxe@Rampage Formula. When i set 1.42VTT in BIOS, Everest shows, that VTT is 1.34. Which one should i trust - sensoar reading or bios setup? My GTLREF setting is 65x.

neither can really be trusted 100%, but either setting is below the absolute max intel spec. You can always check with a DMM look for the measure points or ask in your mobo thread for someone to show you where to measure it.

It should, but it does not. Actually, it's Prime-stable for more than 3 hours, at this time i'm running it at 1.4065, BIOS says it's 1.352, OCCT says 1.36. If i lower it or increase it, it just affect the stability in Prime(actually, 1.4125 is the max, what i was trying). And again, which value is real - 1.4VTT BIOS set, or BIOS Hardware Monitoring and Everest - 1.34. And can i lower VTT and set 67x for GTLREF or it's too much?

Sounds like you have one or more voltage settings too low, or your GTL's arent set up. However crashing/locking up on idle is usually only affecting people using LLC and from your vdrop it appears you are not using it. Make sure your vNB (vMCH) is set high enough to keep it stable, and make sure your ram is stable also.

If you cant find what setting is responsible for the instability, drop the speed until it is stable and work up from there again.

Also running 0.67x GTL ref with ~1.34 Vtt is fine you just need to keep your Vref under ~1.0v as the max. that setting would give you 0.897v which is fine.