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

[seban]

thx mate, your post is really clear

however i've another question about the NB GTL:

the formula is the same than the other (vFSB x 0.64 = result - in that case 0.768) so i need to set the NB GTL like the GTL 0/2 or the GTL 1/3 correct? so if i follow your example and i want to put ALL my GTL to 0.8v i need to set +34mV onto the NB GTL correct?

TIA and merry xamas!

No problem m8 glad I can help.

Well some time ago I was also wondering if I should set (just as you my friend) same GTL NB value as I am using for CPU GTL but I am not sure if it does the trick.

When I was tweaking NB GLT for the very first time I just set it to the same value as CPU GTL (I was at about 0.9v for CPU so I did same thing for NB) but it did not work. So I was just upping gradually NB GTL and stoped at one which gave me best resoults which was +60 at my vtt at that time in the past.

Then I fine tuned CPU GTLrefs. In the end CPU GTLrefs after fine tuning are almost the same as NBGTL ref which is working for me - so it looks like there is a correlation but also it might be just a coincidence.

I was lucky enough that I had problem that was solved by fine tuning NB GTL ref so I knew exactly when I set it to correct value.

If you want to have same effect just downgrade you vNB from your stable one by 2-3 notches to make it not stable and than fine tune NBtlref so you should see when it gets stable again and which NBGtl values is working for you.

K back to supper

[CryptiK]

any settings for the 780i with q9450 around 3,6-3,8 ghz

got new 780i board and old settings cant keep me running for more than 20 min

cpuv 1.5 yes i tried less but last board needed 1.5vcore new one is as stable 20min @ 1.38 as it is with @ 1.52 no v-drop pencile mode yet
vtt 1.3 1.2 wount chanfe the fail time
ddr 2.1
nb 1.4 tried 1.45 to 1.3
sb 1.5 @ stock tried up to 1.6
nb to sb 1.30 stock is 1.2 but it never matters unless it is above 1.4

lane 0 +.45 ive messed with these settings for 2 days with no love other than this gives me 20 ish minutes and every thing else is respectivley worse
lane 1 +.45
lane 2 +.05
lane 3 +.05

You are going to have to drop the clock to where you are stable (eg: 3.4GHz) and slowly work up. Each board can behave quite differently from the last, even though the are the same model. There is no way you should need 1.5 vcore for those clocks, drop it to around 1.4v, Vtt 1.3v, vPLL 1.55v, and get it stable at lower clocks then work up. Each time it gets unstable after a small increase, work out what is required for it to be stable.

thx mate, your post is really clear

however i've another question about the NB GTL:

the formula is the same than the other (vFSB x 0.64 = result - in that case 0.768) so i need to set the NB GTL like the GTL 0/2 or the GTL 1/3 correct? so if i follow your example and i want to put ALL my GTL to 0.8v i need to set +34mV onto the NB GTL correct?

TIA and merry xamas!

In your previous post I think you've got the GTL Refs around the wrong way. GTL Ref 0 & 2 = 0.635x and 1 & 3 = 0.67x.

So your settings should look something like this for example:

GTL Ref 0 = +50mv
GTL Ref 1 = +10mv
GTL Ref 2 = +50mv
GTL Ref 3 = +10mv

Your NB GTL Ref has nothing to do with the CPU GTL Refs. The NB is a separate chip and needs it's GTL Ref set for whatever it specifically needs. For the M2F this is usually between -50mv and +60mv.

[seban]

Also to make things more precise "cross" exchanging correction numbers to "-" values like example below does not lead to same GTL resolute. They are completely different values which give completely different GTLs.

GTL Ref 0 = +50mv = GTL = 0.9336025v
GTL Ref 1 = +10mv = GTL = 0.9381305v
GTL Ref 2 = +50mv
GTL Ref 3 = +10mv

not equal

GTL Ref 0 = +30mv = GTL = 0.9136025v
GTL Ref 1 = -10mv = GTL = 0.9181305v
GTL Ref 2 = +30mv
GTL Ref 3 = -10mv

Above calculations made for vtt = 1.365v