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

[mikeyakame]

Interesting, as I could find no such reference to AGTL+ bus voltage definition in the e7000/8000 data sheet.

Aye we are all here to help each other. I don't think any other spec datasheet lists the GTLREF voltage specs besides the QX9000 one. I haven't seen it in any other datasheet at least.

[CryptiK]

So to simplifier you take your FSB Termination Voltage (VTT) and multiple it by whatever increments you have for GTLs, right?

IE:

45nm:
VTT x GTL increment = GTL Refs

1.22 x 0.635 = 0.7747

Or have I got that completely wrong?

You are correct if you just have the option to set which multiplier is used, and the resultant GTL+ Ref voltage is Vtt x GTL Increment.

Aye we are all here to help each other. I don't think any other spec datasheet lists the GTLREF voltage specs besides the QX9000 one. I haven't seen it in any other datasheet at least.

Thanks mate yeah I just checked through and only found it mentioned there. I actually run my e8400 at 0.667x as I find it is more stable. I find it strange they don't mention it elsewhere.

Thanks for fielding the other questions too.

[Singh400]

You are correct if you just have the option to set which multiplier is used, and the resultant GTL+ Ref voltage is Vtt x GTL Increment.

Well I've got both my GTLs set tp 0.635 and it's running fine. Don't really see a need to increase it. TBH still trying to get my head round it all.

[mikeyakame]

Well I've got both my GTLs set tp 0.635 and it's running fine. Don't really see a need to increase it. TBH still trying to get my head round it all.

Yeah only change it if you adjust vTT , if its on auto leave GTLREF on auto. You shouldn't adjust GTLREF at all unless you manually set vTT and vNB.

[zpower]

Hello to all,

I m trying to figure out what are my GTL Ref values for my system but i am missing something...

my Vtt is 1.31v

so,

1.31v x 0.667 + Y = 1.31v x 0.635
0.87377v + Y = 0.83185v
Y = 0.83185v - 0.87377v
Y = -0.041v
Y = -41 mv

This value refers to GTL Ref 1/3 or 0/2 ???
If it refers to 1/3 what i put to 0/2 and viceversa

By the way, i have an asus rampage extreme and a QX9770 (45nm)

Thanks in advance for any help given!

Alex

[h0t]

Hello everybody.
I'm having some trouble understanding that the GTL Ref! : \
Would I could say that I have values ​​for? Here is (I think!) The information they need to help me please:

CPU Ratio Setting: 9
FSB Frequency: 380
DRAM Voltage: 1.88
Timings: 9-9-9-24
CPU Voltage 1.25000
CPU GTL Voltage Reference (0 / 2) Auto
CPU GTL Voltage Reference (1 / 3) Auto
CPU PLL Voltage 1:52
FSB Termination Voltage 1.12
NB Voltage 1.12

My system:

E8500
P5Q3 Deluxe WiFi-AP
Gainward HD4870 Golden Sample
LC-Power Arkangel 850W V2.3 140mm
2GB - Corsair XMS3 CM3X1024-1600C7DHX

Thank you!