Official DFI LanParty UT X38-T2R(and LT) Discussion/Review/Overclock/Guide Thread

[Rinaun]

So with a Q6600, what kind of gtl numbers am I looking for? Am I looking for more Similar numbers, or farther apart? I've tried a bunch and I can't seem to find the sweet spot for my board with the 67% rule.

[t_ski]

The gtl values (if I understand them correctly) are based on your CPU VTT and NB voltage. What voltage are you using?

[eva2000]

GTL values are all based on CPU VTT nothing to do with NB..

from my experience on Asus boards the GTL ref volts are optimal even on DFI

kentsfield
gtl cpu = ~63%
gtl nb = ~67%

yorkfield 45nm
gtl cpu = ~63%
gtl nb = ~61%

but i could be wrong as my DFI LT X38 has ~30-50FSB less max FSB for E6850/E8500/QX9650 than on Asus Blitz Formula/Extreme.

[Rinaun]

I understand that it correlates to your VTT. what I was trying to say was the general "gap" between 1/3, 0/2, and nb gtl values. right now I'm running 1.3 VTT with 1.4 on the northbridge, with values of 125/115/95 at 445 x 9 (trying 333/667 for now).

GTL values are all based on CPU VTT nothing to do with NB..

from my experience on Asus boards the GTL ref volts are optimal even on DFI

kentsfield
gtl cpu = ~63%
gtl nb = ~67%

yorkfield 45nm
gtl cpu = ~63%
gtl nb = ~61%

but i could be wrong as my DFI LT X38 has ~30-50FSB less max FSB for E6850/E8500/QX9650 than on Asus Blitz Formula/Extreme.

so how would I go about doing this? Multiply 1.3 * .63 and .67 for my two values?

[Praz]

I understand that it correlates to your VTT. what I was trying to say was the general "gap" between 1/3, 0/2, and nb gtl values. right now I'm running 1.3 VTT with 1.4 on the northbridge, with values of 125/115/95 at 445 x 9.



so how would I go about doing this? Multiply 1.3 * .63 and .67 for my two values?

With a Q6600 your in the ballpark with those value for 1.3V VTT. You might try a rang of +5 to -10 for each from your current settings.

You won't be able to find the values like that. The values you set in the BIOS do not correlate to a percentage of VTT with no easily used formula.

[Neuuubeh]

nice info What about the nb gtl, what values should be set there? Used cpu is a 45nm x3350. Ballpark?

[Rinaun]

nice info What about the nb gtl, what values should be set there? Used cpu is a 45nm x3350. Ballpark?

you need to list cpu VTT for any advice, but its basically your CPU vtt, multiplied by .67. then, you look at the CPU VTT tables floating around here (Clunk has one on his site; somewhere in this thread). Go + or - from there is what I would do for 45nm (But I multiplied by .68; I heard 65nm quads like a bit more).

http://www.clunk.org.uk/forums/hardw...rboards-2.html Thanks clunk for the awesome info!

[Neuuubeh]

cool, thanks a lot Was thinking there might be some basic rule of the thumb (like say 61% or w/e )
Playing a bit around with these got rid of that pesky error in prime

[zsamz_]

Hey Sam, just for $hit$ and giggles, why don't you post a pic?

i had 1 with 2 60mm fans fo a while but i did not think it was good enough so i made these
2 90mm panaflo fans n i added grills stuk them together with gluegun
you can make em with 80mm fans fits better in the case
i gona make attachments when i have time i aklways testin ram so i not makin them permanent for now

[t_ski]

Thanks. I always like seeing the mods

[zanzabar]

how is that mounted in there, dose it just sit there

[Jor3lBR]

Here's the XTC with two big fat ATI HD 3780's and still some room to have a dinner between them

[Rinaun]

Here's the XTC with two big fat ATI HD 3780's and still some room to have a dinner between them

Thats still too close for comfort for me, I need atleast 1/2in between them to make me satisfactory. I use second slot.

[zsamz_]

anyone running a bfg 8800gt on the board?
i only game @ 1200x800 good choice?
i'm thinkin of pikin one up tomorow

[eva2000]

I understand that it correlates to your VTT. what I was trying to say was the general "gap" between 1/3, 0/2, and nb gtl values. right now I'm running 1.3 VTT with 1.4 on the northbridge, with values of 125/115/95 at 445 x 9 (trying 333/667 for now).



so how would I go about doing this? Multiply 1.3 * .63 and .67 for my two values?

because i'm not that comfortable poking my DMM around the board to measure VTT/GTL, i work backwards from the know DFI X38 GTL ref volts table and adjust cpu vtt according

i.e. if table says 110/105/85 = 0.812v/0.816v/0.812v then i know if CPU VTT in bios is showing 1.28v then i have roughly 63.4%/63.75%/63.4%

No idea if that's accurate but i use quad superpi/systool pi tests to test and for my QX9650 stability occurs at 1.28v VTT with 115/107/88 for quad pi tests. When it's unstable it just reboots at high fsb.

[Rinaun]

because i'm not that comfortable poking my DMM around the board to measure VTT/GTL, i work backwards from the know DFI X38 GTL ref volts table and adjust cpu vtt according

i.e. if table says 110/105/85 = 0.812v/0.816v/0.812v then i know if CPU VTT in bios is showing 1.28v then i have roughly 63.4%/63.75%/63.4%

No idea if that's accurate but i use quad superpi/systool pi tests to test and for my QX9650 stability occurs at 1.28v VTT with 115/107/88 for quad pi tests. When it's unstable it just reboots at high fsb.

Thanks for the advice, I'll go try this. If I wanted to hit around say 475 FSB on 1:1, I'm guessing I'm going to need around 1.3, or will I need more? I'm right now OCCT'ing at 440 with 1.3VTT and values of 125/115/105. Also, should I just focus on ONE set at a time? Or do each affect the others values? Once again, thanks for the help eva

[flexy]

Rinaun, others:

Well from what i read...on each given system..tweaking GTL needs a LOT of reboots and testing. In other words: You have to find your own values which COULD be off +/- 15 from all posted tables..and test, test, test. Even the charts can only give halfway advice.

The other Q would be about what a good VTT is for a given FSB...according to Anandtech they set VTT as high as 1.6 for 400+....i myself keep VTT always a little under VCore...and Vcore for me is 1.46 right now with FSB 442 stable at 1.42 VTT. I consider everything over 1.45 "dangerous"...in terms of possible CPU degradation over time with everything higher. Its just my own "safe zone". Other opinions might vary. If you go through a new system every few months, maybe 6 months life-span per system ... dont hesitate and push 1.55 - 1.6..and then in a few months just dump whatever you have and get new CPU anyway---

For 475 FSB i would definitly go higher than 1.3...but thats also just my own guessing.

[Dimek]

@Jor3lBR
Did you have to change/mod anything to fit RAM cooler over gfx card ?? There is really NO contact between RAM cooler and gfx card ??
Another photos would be nice to see it closely

[Bikerz]

He said it does touch but put some electrical tape over OCZ cooler ends and its fine

[Rinaun]

I found the best advice so far for GTLs was in a completely random thread, the bonetrail board official thread.

To completely understanding the reference voltages is complicated. But a basic understanding of what to do with them is pretty easy.

Adjust it in one direction until you get a failure. The failure criteria can be anything, as long as it's consistent. Booting to Windows is a pretty good test. Fine tune it down to one step = pass, the next step = fail. Then adjust it in the other direction and fine tune in again. You'll end up with a min and max number, usually referred to as you margin window. Then you simply pick the number in the middle of the window, and set your final value at that middle point. That will be your best stability point, at the voltages and frequencies that you tested at.

You don't need to do long term stress testing to find the absolute min and max stability points, your not going to be running out there, you just want to use a consistent, and quick test to fine min and max, so you can then calculate the middle point.

As you increase frequency the min and max numbers, your margin window, will shrink down. The min might shrink faster than the max, so you might start failing because your negative margin, adjustment range below default, has collapsed down to nothing. But you might still have positive margin, adjustment range above default. You could raise your reference level to recenter in the margin window that is remaining.

Now that I've gotten this beast stable at ddr21000, I'm going to tinker with the gtls and see if I can run with it. Should I really worry about 1.55 vcore (when pushing into 4.0)? 1.6 vcore? My water cooling keeps this 3.8 idling at 25 and running at 45.

[zsamz_]

i just got an evga 8800gt put it in
now my pci-e slots not working
gonna try to boot with pci card\
tested the 8800gt on p35 n 965 its ok
any ideas? been fiddlin for 5 hours lol
i get to bios screen the board goes ff boot code n then black screen
boots fine with pci card

[Rinaun]

i just got an evga 8800gt put it in
now my pci-e slots not working
gonna try to boot with pci card\
tested the 8800gt on p35 n 965 its ok
any ideas? been fiddlin for 5 hours lol
i get to bios screen the board goes ff boot code n then black screen
boots fine with pci card

Or maybe your 8800 isnt working? Test in another rig to make sure its your baord, then tweak around.

[Dimek]

@Rinaun
I find this method a little too timetaking as you get your max/min numbers ONLY for ONE config of voltages (Vcore, VTT, VNB, Vddr etc.)... Sometimes instability is more a matter of changing voltage(s) one setting, rather than finding "the middle" GTL value... that btw will have to be changed after optimizing main voltages... endless tweaking...

[zsamz_]

Or maybe your 8800 isnt working? Test in another rig to make sure its your baord, then tweak around.

learn to read

[Jor3lBR]

learn to read

Sam,

How about your PSU? Did you test on the other board with the same PSU or a different one?