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

[mikeyakame]

Indeed

For real though it should bring up a file browser window to select save location and file name!

[omiez]

@ Cryptik

On my Board (P5Q Deluxe) i can set for example 0.635 as GTL Value. So if i want to find my right gtl setting how must i start to set this value ?

For example if i select a higher value 0.640 the GTL increases,right?

So if i am running 1.20V FSBTer i can try what?

I have an E8600 CPU.

[CryptiK]

Yes the higher you set the multiplier the higher the Vref you will get. To start with, set them both to 0.635x and work from there. I have found with both my dual cores they like the address bus GTL Ref (the second GTL Ref on your board) to be a little higher than the data bus GTL Ref, so you could set 0.635x and 0.655x for example. Test for general stability gains at several setting, and find the most stable setup for the given FSB & vFSB. I'm now running on my M2F 1.25 vFSB and the equivalent of about 0.690x and 0.70x on your board, it helped to stabilize my current clock.

*********************

Mikey, I have to agree with you about fine tuning with IBT, it's quite effective. The times & GFlops are very close and consistent when tuned correctly. I have noticed that the first iteration is always a little lower & takes longer though, this is not due to speedstep delay I have that disabled. This run isnt perfect but its pretty close:

[omiez]

Yes the higher you set the multiplier the higher the Vref you will get. To start with, set them both to 0.635x and work from there. I have found with both my dual cores they like the address bus GTL Ref (the second GTL Ref on your board) to be a little higher than the data bus GTL Ref, so you could set 0.635x and 0.655x for example. Test for general stability gains at several setting, and find the most stable setup for the given FSB & vFSB. I'm now running on my M2F 1.25 vFSB and the equivalent of about 0.690x and 0.70x on your board, it helped to stabilize my current clock.

Thank you Cryptik

At the moment i am running Both GTL's in Auto and NB GTL Auto but i want to get them manually to see if i can decrease a little Vcore and some other(if this was possible).

At the moment i am Running the CPU 420x10 RS 15 Passes of IBT.
I tried also 430x10 RS 15 Passes of IBT and 500x8.5 RS 15 Passes IBT.
Maybe i can play a little more to get higher FSB using a smaller multiplier.
The memories i have work very good the for the things i do, Crucial Ballistix Tracer Led Pc6400 @ 560Mhz with only 2.08V measured with Tester on the Board.

I will let you know when i make some tests these days.


Thank you.
Vincent

[andressergio]

Agree with both of you guys, i tuned my GTLS (Thanks CryptiK ) and my runs are very close now

[ci2kla]

Sigh...Another problem...IBT Pass 20 runs that fails ORTHOS Large FFTs P9 in minutes...really disappointed and lost

[CryptiK]

Does increasing vNB, raising the PL or increasing vdimm help? Is your system at least 1000% windows memtest stable?

[spoof]

Does increasing vNB, raising the PL or increasing vdimm help? Is your system at least 1000% windows memtest stable?

Or NB GTL, this was what help by me, when i was testing for FSB. It's NB<->RAM issue and by me not even relaxed timing help, just NB GTL one (or two, if nessecery) steps up.

Well, using 2 days 1.8VTT on your Q9550 don't kill it, let's see if it affects OC ... *speachless*

[Alien Grey]

Sigh...Another problem...IBT Pass 20 runs that fails ORTHOS Large FFTs P9 in minutes...really disappointed and lost

Try MemTest86+ V2.11 to test your Memory. If you can pass test 5 without errors you won't have any problems with the Memory.

[CryptiK]

I'd actually recommend using HCI memtest over bootable memtest, I have had ram pass bootable memtest that didnt last till 3% HCI memtest, and failed blend almost instantly.

It is found here: http://hcidesign.com/memtest/download.html

I assume you're running 2GB of ram so open 2 instances of HCi and set 860MB of ram in each and let it run till around 1000%. If you get an error keep tweaking your ram/NB settings. I also recommend making a custom run in Orthos of 4096K and letting it run for at least an hour.

If you can pass IBT then your cpu is at least quite stable, but running small FFT is also recommended.

[mikeyakame]

Also do Blend in Prime95 it will find most memory / gtl errors and report as rounding errors. The severity of the rounding difference from what it should be gives you a rough estimate on the severity of the problem.

Small FFT tests L1/L2 cache mostly.
Large FFT tests small amounts of memory and L2 cache.
Blend tests large amounts of memory and copying between memory.

[CryptiK]

I find the custom run at 4096K FFT length I suggested is more stressful on the ram and NB than blend, but use whatever you want really stability is a subjective & personally definable thing.

[ci2kla]

OK I'll try the following tests and report back. Thank you guys...

1. Prime95 Blend: overnight
2. HCI Memtest 3.8...Quad run each 400MB for 1000%
3. ORTHOS SP2004 Small FFTs Priority 9

[PRJ]

This step seems very complicated is this necessary to have a stable overclock like 4GHz on a licquidcooled i7 920

[mikeyakame]

No. I7 doesn't use GTLs. it's for FSB only. I7 has its own architectually complex features you can get your head around though if it interests you

[PRJ]

No. I7 doesn't use GTLs. it's for FSB only. I7 has its own architectually complex features you can get your head around though if it interests you

Good to know, it interests me, but til a sertain point, to complex and I leave it on auto. Thanks

[ci2kla]

Update: Small FFTs Failed 1 hr 4 mins, error in result, not rounding
CPU GTL: -30, auto, auto, auto

[Alien Grey]

I'd actually recommend using HCI memtest over bootable memtest, I have had ram pass bootable memtest that didnt last till 3% HCI memtest, and failed blend almost instantly.

Funny, i was Prime95 Blend test stable but couldn't pass MemTest86+ V2.11 Test 5 without raising the DRAM Voltage 3 steps in the BIOS.

[Bobly]

Okay I hate to say this but on three separate occasions I've decided I would try and get my head around it and set my GTL reg values to break the 4GHz on my Q9550 and get stable (Prime95 overnight blend stable but tend to get random freezes when gaming/browsing/idle) but I just get lost >.<.


I've understood the math behind it, but my problem is I have everything set to Auto except Vcore (1.4V in BIOS, 1.36V CPU-Z) and NB/SB (1.5V / 1.5V).
Current setup: Asus S2E w/ Q9550 @ 3.966GHz (1866FSB) - 1x2GB DDR3 1600MHz 7-7-7-20 (Need to RMA other module, doesn't pass memtest).
Other than the ram values set to spec and the voltage I've already mentionned, everything is pretty much on auto.

What VTT value would be a good one to start off with if I set it to manual? What's considered a maximum for a 45nm quad? Without this starting point I can't aim to optimise my GTL Ref values.
Any additional S2E/Q9550 info that one may know would also be appreciated

Considering I got this far with only touching Vcore and NB voltages I would assume I could break 4GHz, my goal being a FSB of 1920 .

[CryptiK]

Funny, i was Prime95 Blend test stable but couldn't pass MemTest86+ V2.11 Test 5 without raising the DRAM Voltage 3 steps in the BIOS.

Stress tests can be weird. Some guys pass IBT and fail small FT, some pass small FFT and fail IBT etc. There's so many variables between systems I guess there's no specific rules. That's why I use every stress test I can.

Okay I hate to say this but on three separate occasions I've decided I would try and get my head around it and set my GTL reg values to break the 4GHz on my Q9550 and get stable (Prime95 overnight blend stable but tend to get random freezes when gaming/browsing/idle) but I just get lost >.<.


I've understood the math behind it, but my problem is I have everything set to Auto except Vcore (1.4V in BIOS, 1.36V CPU-Z) and NB/SB (1.5V / 1.5V).
Current setup: Asus S2E w/ Q9550 @ 3.966GHz (1866FSB) - 1x2GB DDR3 1600MHz 7-7-7-20 (Need to RMA other module, doesn't pass memtest).
Other than the ram values set to spec and the voltage I've already mentionned, everything is pretty much on auto.

What VTT value would be a good one to start off with if I set it to manual? What's considered a maximum for a 45nm quad? Without this starting point I can't aim to optimise my GTL Ref values.
Any additional S2E/Q9550 info that one may know would also be appreciated

Considering I got this far with only touching Vcore and NB voltages I would assume I could break 4GHz, my goal being a FSB of 1920 .

Freezing/BSOD at idle but stable under load usually happens to guys using load line calibration (no vdroop) where under load the vcore rises slightly but at idle it's just one step too low.

I'd try setting your Vtt to 1.25v first and experiment with your GTL's and see what gives you the best stability. You can always work up from 1.25v as you test. From what I've read, around 1.40 - 1.42v for Vtt is about as high as most people go on air/water.

[ci2kla]

Some tests update again:
1. Small FFTs Priority 9 fail in 1 hr 4 min
2. Prime95 Crashed during overnight run therefore I don't know the duration

But one thing for sure is that the system is not stable still
for IBT testing, 1.25v VTT will fail 1/10 runs while 1.2v can pass 20 runs. I wonder if vNB GTL is wrongly set (+60mv). Currently running 4x Memtest 3.7 (410MB each). Will report back ASAP after the result is out. I guess it's CPU GTL related but I don't have a clue still...comon

[mikeyakame]

don't stress too much about it mate I've spent accumulations all up of weeks playing around with minor settings. Everything takes time I suppose.!

[ci2kla]

don't stress too much about it mate I've spent accumulations all up of weeks playing around with minor settings. Everything takes time I suppose.!

Yea I know fine tuning takes time and patience that's why I'm still learning
But just sometimes quite a bit annoying when I was easily get lost track with the settings and confused

[CryptiK]

So your chip seems to like low Vtt. I'd just try all the combinations of GTL Refs you can leaving the Vtt at 1.2v to start with then. Also you should be adjusting all 4 of the GTL Refs as you have a quad.

Try for example:

GTL Ref 0 -30mv
GTL Ref 1 -70mv
GTL Ref 2 -30mv
GTL Ref 3 -70mv

or

GTL Ref 0 -20mv
GTL Ref 1 -60mv
GTL Ref 2 -20mv
GTL Ref 3 -60mv

or

GTL Ref 0 -10mv
GTL Ref 1 -50mv
GTL Ref 2 -10mv
GTL Ref 3 -50mv

or then try having the address bus slightly higher proportionally:

GTL Ref 0 -5mv
GTL Ref 1 -40mv
GTL Ref 2 -5mv
GTL Ref 3 -40mv

or

GTL Ref 0 +10mv
GTL Ref 1 -25mv
GTL Ref 2 +10mv
GTL Ref 3 -25mv

You get the idea anyway. There are lots of combinations I didn't write there, but just keep trying you'll get it. Also you should try raising Vtt to 1.25 - 1.30v and using negative GTL Refs like the first couple of sets I posted above.

Write down what you have tried and what Vtt you used, and just work through it bit by bit. You're doing well so far

[mikeyakame]

Yea I know fine tuning takes time and patience that's why I'm still learning
But just sometimes quite a bit annoying when I was easily get lost track with the settings and confused

You should see my notebooks with scribble all over from taking note of minor changes i make and whether they work or not You just need to make one or two small changes at a time, make notes of what you changed and whether ti was better or worse so you can refer back to it later. It helps alot

It tooks me months of patience and testing to get my current completely bulletproof 481MHz FSB as it is now. Also few sets of memory sticks and other things!

If there is one thing you have it is time, so take advantage of that and don't fluster yourself for nothing. I personally use both OC profiles on my Rampage, Profile 1 is for Stable OC thats tested and proven, Profile 2 is for testing new settings. That way I can just save my current testing settings to spare profile, and go back to stable anytime I want. Then when my new set of testing settings prove completely stable and bulletproof I'll save them to first profile and start working on new ones in profile 2. I've reached the limits of my board with its bios though. So my current settings are the best I'll be able to get them with this CPU and ram and I'm extremely happy with that. Took a few months of long testing and trial but hey it's why enthusiast products to me make me feel so enthusiastic to play with