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

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11-08-2009, 07:09 AM
Salty

You guys have helped a lot of overclockers with this thread :up:

Quote:

have you tried setting them both to normal or +3%?

Both on Normal worked up to 444. Probably changed with +.15 vtt raise. Then -3%/Normal was the best combo - passed 37 hours prime95 blend. Putting them both on the same since just bluescreens or fails prime faster. When I went to +.2 vtt the best setting proved to be -6%/Normal. Not what I expected. :shrug:
-6%/-3% failed within a few minutes too.
The GTLs allowed lowered vtt and mch when first applied at 4.22GHz oc. Didn't notice any further gain when changed GTL again for +.2 vtt.

Quote:

Have you checked your ram stability?

I changed from 2x2GB Corsair 8500 to 2x2GB G.Skill 8800 SuperPi because the Corsair wasn't happy over 1094. So far the G.Skill only fails if I give it more than 2.0v. (Just testing) Both sets pass Memtest, the bootable cd version, and large fft's in Prime as long as settings are ok. Possible maybe. What stress test is best for vista to push ram in particular?

The last two. Of course. I have not played with them much. Embarrassingly obvious. :idea: Will see if they help.
11-10-2009, 06:40 AM
CryptiK

Well Prime 95 Custom run with all ram utilized (select custom instead of small or large FFT and set ~800 - 4096K and set ram to use to all your free ram) - this will load your ram very hard. Setting 200 - 800 K loads the ram but also the NB quite hard. Smaller FFT's begin to load the CPU very hard. HCI Memtest is also a nice tool, as is Linx set to max mem.

IMO no one program will test everything fully, so running a suite of programs is really the way to go. Sounds like your system is quite stable hardware wise, perhaps your BSOD's are OS related or ageing PSU related?
12-11-2009, 01:21 PM
Runecaper

Hi.

Ok, so i've been reading this thread and tried to understand it, i could use some help if possible though:

I'm running an e8400 at 4.05, with 1.4 vCore (bios setting, 1.36 CPU-Z report) on an EVGA 790i.

As soon as i lower vCore, Core0 starts failing Prime FFT tests. Core1 can go down to 1.26 vCore and still run stable.

I have all GTLref lanes set to auto and they're all at +00mV according to BIOS.

Is there any way i can help Core0 by messing around with GTL settings? Please help me if you can, 1800FSB 24/7 would be awesome but 1.4 is a bit high.
12-23-2009, 12:02 PM
BailA

Hi,i have a Maximus Formula II with Q9650,my voltage is this:

Cpu V=1,3
Cpu PLL=1.5
FSB Termination Voltage=1,1

What'is the ideal setting for GTL?
Thank's and sorry for my english
01-04-2010, 09:50 AM
CryptiK

^ BailA - If you aren't overclocking much (less than ~4GHz) you can just leave them on auto if you like. Each CPU likes something different though it seems, so perhaps experiment a little bit to see what works best. Don't worry, at only 1.1v FSB Termination voltage, you won't be doing any damage no matter what you set the GTL Refs to.

You may find you get some added stability if you set +50mv/+10mv/+50mv/+10mv so give that a try first if you don't want to leave them on auto.

Quote:

Originally Posted by Runecaper

Hi.

Ok, so i've been reading this thread and tried to understand it, i could use some help if possible though:

I'm running an e8400 at 4.05, with 1.4 vCore (bios setting, 1.36 CPU-Z report) on an EVGA 790i.

As soon as i lower vCore, Core0 starts failing Prime FFT tests. Core1 can go down to 1.26 vCore and still run stable.

I have all GTLref lanes set to auto and they're all at +00mV according to BIOS.

Is there any way i can help Core0 by messing around with GTL settings? Please help me if you can, 1800FSB 24/7 would be awesome but 1.4 is a bit high.

Yes GTL tuning may help, but I doubt it will close the gap between your cores much. Try setting different GTL Ref's and see if there is an improvement. You wont damage anything so long as your Vtt (vFSB) is not too high. Try setting Vtt (vFSB) to around 1.25v and play around with the GTL's.
01-08-2010, 11:13 PM
yeahoo

Here's my settings. Please suggest me for my settings

Q9550 C1, Ramapage Extreme x48
453fsb@8.5@1.296v(windows v) with LLC enable
vtt 1.33
vNB 1.59 (lower than that it won't stable, i run 6gb of RAM)
CPU PLL 1.65x

CPU GTLVref
0. 80mv
1. 70mv
2. 80mv
3. 70mv
NB GTLV = Auto
i ran prime95 for about 45 mins then i stopoped

i tried to set to as people sugguest somewhere in this thread as
0. Auto
1. -40
2. Auto
3. -40
NB GTLV = Auto
this setting is totally unstable. i can't prime95 at all

Will the CPU GTLV i set to 80 and 70 damage the CPU?

what NB GTLV i need to set?

Thanks
01-10-2010, 05:59 AM
CryptiK

No, at your Vtt 80 & 70mv wont damage anything.

I set +50 to +70mv for the NB GTL Ref when testing with a Q9650 - this helped lower vNB too.
02-19-2010, 04:43 PM
Saturn™

Hello, people!
two days I can not adjust the FSB 533, Prime95 is not stable.... :shrug: please help me.

Intel Core 2 Duo E8400 [E0] ~4264MHz [8x533]
Asus Maximus II Formula P45 rev.A3 [bios 2202]
Geil Ultra Plus [2x2Gb] DDR2-1066Mhz 5-5-5-15
Corsair TX650W
Microsoft Windows® 7 Ultimate x64

Code:

Ratio CMOS Setting: 8 FSB Frequency: 533 CPU Clock Skew: Auto NB Clock Skew: Auto FSB Strap to North Bridge: 400 DRAM Frequency: 1066 DRAM CLK Skew on Channel A1: Auto DRAM CLK Skew on Channel A2: Auto DRAM CLK Skew on Channel B1: Auto DRAM CLK Skew on Channel B2: Auto DRAM Timing Control: Manual 1st Information: CAS Latency: 5 DRAM Clocks DRAM RAS to CAS Delay: 5 DRAM Clocks DRAM RAS Precharge: 5 DRAM Clocks DRAM RAS Activate to Precharge: 15 DRAM Clocks RAS to RAS Delay: AUTO Row Refresh Recycle Time: AUTO Write Recovery Time: AUTO Read to Precharge Time: AUTO 2nd Information: Read to Write Delay (S/D): AUTO Write to Read Delay (S): AUTO Write to Read Delay (D): AUTO Read to Read Delay (S): AUTO Read to Read Delay (D): AUTO Write to Write Delay (S): AUTO Write to Write Delay (D): AUTO 3rd Information: Write to PRE Delay: Auto Read to PRE Delay: Auto PRE to PRE Delay: Auto All PRE to ACT Delay: Auto All PRE to REF Delay: Auto DRAM Static Read Control: dis DRAM Read Training: dis MEM. OC Charger: enab Ai Clock Twister: strong Ai Transaction Booster: Manual Common Performance Level:10 Pull-in of CHA PH1: Disabled Pull-in of CHA PH2: Disabled Pull-in of CHA PH3: Disabled Pull-in of CHB PH1: Disabled Pull-in of CHB PH2: Disabled Pull-in of CHB PH3: Disabled PCIE Frequency: 100 CPU Voltage: 1.375 CPU PLL Voltage: 1.50 FSB Termination Voltage: 1.21 DRAM Voltage: 2,2 North Bridge Voltage: 1.36 South Bridge 1.5 Voltage: 1.50 South Bridge 1.1 Voltage: 1.10 CPU GTL Reference (0): Auto CPU GTL Reference (1): Auto CPU GTL Reference (2): Auto CPU GTL Reference (3): Auto NB GTL Reference: Auto DDR2 ChA Reference Voltage: Auto DDR2 ChB Reference Voltage: Auto North Bridge DDR Reference: Auto CPU Configuration: Ratio CMOS Setting: 8 C1E Support: Disabled Max CPUID Value Limit: Disabled Intel Virtualization Tech: Disabled CPU TM Function: enable Execute Disable Bit: Disabled Load-Line Calibration: Enabled CPU Spread Spectrum: Disabled PCIE Spread Spectrum: Disabled
02-20-2010, 12:21 AM
Telo

Quote:

Originally Posted by Saturn™

FSB Termination Voltage: 1.21

Your VTT might be a bit low for 533FSB.
02-20-2010, 12:43 AM
CryptiK

Quote:

Originally Posted by Saturn™

Hello, people!
two days I can not adjust the FSB 533, Prime95 is not stable.... :shrug: please help me.

Intel Core 2 Duo E8400 [E0] ~4264MHz [8x533]
Asus Maximus II Formula P45 rev.A3 [bios 2202]
Geil Ultra Plus [2x2Gb] DDR2-1066Mhz 5-5-5-15
Corsair TX650W
Microsoft Windows® 7 Ultimate x64

Code:

Ratio CMOS Setting: 8 FSB Frequency: 533 CPU Clock Skew: Auto NB Clock Skew: Auto FSB Strap to North Bridge: 400 DRAM Frequency: 1066 DRAM CLK Skew on Channel A1: Auto DRAM CLK Skew on Channel A2: Auto DRAM CLK Skew on Channel B1: Auto DRAM CLK Skew on Channel B2: Auto DRAM Timing Control: Manual 1st Information: CAS Latency: 5 DRAM Clocks DRAM RAS to CAS Delay: 5 DRAM Clocks DRAM RAS Precharge: 5 DRAM Clocks DRAM RAS Activate to Precharge: 15 DRAM Clocks RAS to RAS Delay: AUTO Row Refresh Recycle Time: AUTO Write Recovery Time: AUTO Read to Precharge Time: AUTO 2nd Information: Read to Write Delay (S/D): AUTO Write to Read Delay (S): AUTO Write to Read Delay (D): AUTO Read to Read Delay (S): AUTO Read to Read Delay (D): AUTO Write to Write Delay (S): AUTO Write to Write Delay (D): AUTO 3rd Information: Write to PRE Delay: Auto Read to PRE Delay: Auto PRE to PRE Delay: Auto All PRE to ACT Delay: Auto All PRE to REF Delay: Auto DRAM Static Read Control: dis DRAM Read Training: dis MEM. OC Charger: enab Ai Clock Twister: strong Ai Transaction Booster: Manual Common Performance Level:10 Pull-in of CHA PH1: Disabled Pull-in of CHA PH2: Disabled Pull-in of CHA PH3: Disabled Pull-in of CHB PH1: Disabled Pull-in of CHB PH2: Disabled Pull-in of CHB PH3: Disabled PCIE Frequency: 100 CPU Voltage: 1.375 CPU PLL Voltage: 1.50 FSB Termination Voltage: 1.21 DRAM Voltage: 2,2 North Bridge Voltage: 1.36 South Bridge 1.5 Voltage: 1.50 South Bridge 1.1 Voltage: 1.10 CPU GTL Reference (0): Auto CPU GTL Reference (1): Auto CPU GTL Reference (2): Auto CPU GTL Reference (3): Auto NB GTL Reference: Auto DDR2 ChA Reference Voltage: Auto DDR2 ChB Reference Voltage: Auto North Bridge DDR Reference: Auto CPU Configuration: Ratio CMOS Setting: 8 C1E Support: Disabled Max CPUID Value Limit: Disabled Intel Virtualization Tech: Disabled CPU TM Function: enable Execute Disable Bit: Disabled Load-Line Calibration: Enabled CPU Spread Spectrum: Disabled PCIE Spread Spectrum: Disabled

This type of non GTL Ref related question would be best made in the Maximus II Formula Thread

Those voltages would have been stable on my old M2F but I wasn't using 2 x 2GB sticks.

You may need to set Vtt to ~1.25 - 1.30v depending on your CPU's needs. vNB should be ok for 533 FSB.

If raising Vtt doesn't help, try lowering your FSB to say 510 FSB and working your way up.
02-20-2010, 01:06 AM
Saturn™

I assign values up to 1.38! Prime95 falls after a few minutes. :(
02-20-2010, 02:28 AM
CryptiK

Try setting GTL's to +40/auto/+40/auto and see if that helps. Perhaps also bump up vNB a little.

What are your NB temps like under load? Some M2F's ram very hot, and the washer mod was required.
02-20-2010, 05:53 AM
Saturn™

With the above settings, the system is completely stable in Prime95 at FSB = 520 ... 533 has already snowed errors... Maybe it FSBWall?

CryptiK,
ok, I'll try... :)
MoBo Temp = 57° Max. I have never seen temperatures above 60 °. Cooling is original, no fans ...
02-20-2010, 08:06 AM
CryptiK

Could be FSB wall but I would be surprised if this was the case. Try also, CPU clock skew = 200 NB clock skew = normal

57*C is pretty warm, perhaps you need some washers under the mobo heastink screws - i posted a pic of this in the M2F thread.
03-22-2010, 12:23 PM
AntecX

Hello
I have a DFI X48 LT T2R liquid cooled and a Q6600 VID 1.2000v
But I have trouble setting the GTL for this CPU ...

I have set:
VTT 1.327v in BIOS, 1.312v in WIN
CPU GTL 0 / 3 @ 115
CPU GTL 1 / 2 @ 105
NB GTL @ 100

but my Q6600 is not stable at 423x9 with 1.400v
03-27-2010, 05:54 PM
CryptiK

I'm not familiar with the older X48 DFI GTL system, they don't use multipliers or mv values. You'll have to just use trial an error to see what works best, or look in old threads and see what others used with quads as a starting point.
04-26-2010, 08:29 AM
sheri

What are the default GTL multipliers for REX? I heard that 0/2 has different multi than 1/3?
Funny thing is that i managed to push E8400 to 6100 MHz with all GTL's on auto :D
http://valid.canardpc.com/show_oc.php?id=1150675

edit:
ok, i got it

0/2 multi is 0.635x
1/3 multi is 0.667x

But despite 0.667x multi on 1/3 i should aim into 0.635?
04-26-2010, 08:39 AM
CryptiK

I dont know, I assume 0/2 is 0.635x and 1/3 is 0.667x

I have to tweak them for stability when benching at FSB limit of CPU. Can help get that last couple of MHz. Congrats on 680 FSB :up:
04-26-2010, 08:46 AM
sheri

Quote:

Originally Posted by CryptiK

I dont know, I assume 0/2 is 0.635x and 1/3 is 0.667x

I have to tweak them for stability when benching at FSB limit of CPU. Can help get that last couple of MHz. Congrats on 680 FSB :up:

Thx :rolleyes:, but on 1/3 i have to aim into 0.635x multi right?
05-26-2010, 11:37 PM
Willhub

Hello.

CryptiK, would you have any ideas what sort of GTL's I need for my X3350 and Asus P5Q-E?

I posted a thread here: http://www.xtremesystems.org/forums/...02#post4407602

Thanks
Will.
05-27-2010, 05:05 AM
CryptiK

Quote:

Originally Posted by sheri

Thx :rolleyes:, but on 1/3 i have to aim into 0.635x multi right?

Yeah one of my CPU's likes around that value, but another likes lower than that or I get 3D corruption when pushing the max FSB of the CPU. Vtt also needs to be adjusted for FSB, so I do that first then set GTL Refs.

Quote:

Originally Posted by Willhub

Hello.

CryptiK, would you have any ideas what sort of GTL's I need for my X3350 and Asus P5Q-E?

I posted a thread here: http://www.xtremesystems.org/forums/...02#post4407602

Thanks
Will.

No idea TBH never used one, but I'd say you could use what other people set with Q9650's as a rough guide - the Q9650 thread in the Intel section should be helpful for you. Start at default GTL's, and experiment with Vtt and fine tune using GTL's. Expect it to take awhile to get it dialed in though quads are tricky compared to duals.
05-27-2010, 05:24 AM
Willhub

Thanks I'll have a look at that thread.

Hopefully this app in the OP will give me some decent GTL ref, but I am abit confused about the calculator for the GTL's.

Max and min GTL are different in that to what I have in my bios and in the spreadsheet I cannot change them.

Also unsure if I need to change that 0.15v in blue shade?

I notice this " PS2. This calculator is made for MF2 board but will work with all boards that got correction number in equation (like +40 or - 20 and so on). " So does that mean I have to change those things in yellow?
05-27-2010, 03:54 PM
Willhub

Anyone know how to use the GTL Calculator? :(
05-28-2010, 03:31 PM
Willhub

Can someone help please?

I don't get this:

Quote:

If you have a 45nm cpu, you are aiming for the voltage given by the 0.635x multiplier, so to work out what to put for the the 0.667x GTL Ref (Y) values (it will be a negative number to make the resulting voltage the same as the 0.635x GTL Ref voltage), use the following eqn, but substitute the Vtt you use, in place of the example Vtt.

In the examples given, I have rounded off to 3 decimal places throughout for simplicity.

For me, Vtt = 1.14v

Equation:

Vtt x 0.667 + Y = Vtt x 0.635

1.14v x 0.667 + Y = 1.14v x 0.635
0.760v + Y = 0.724v
Y = 0.724v - 0.760v
Y = -0.036v
Y = -36 mv

So to verify it:
1.14v x 0.635 = 0.724v
1.14v x 0.667 = 0.760v

0.760v - 0.036v = 0.724v

or an easier, non algebraic alternative:

1.14v x 0.635 = 0.724v
1.14v x 0.667 = 0.760v
0.724v - 0.760v = -0.036v
= -36mv

So for me it is 1.38 (VTT) x 0.635 = 0.8763

Problem is, in my GTL Ref I canot put 0.8764, or 0.875, that is higher than it will possibly allow.

Please I need help.

Thanks
01-28-2011, 07:05 AM
MAXMIZ

Hi, I do not understand your calculations, if he can tell me if my settings are correct.

Asus P5Q-E with E8500

CPU Voltage: 1.42
CPU GTL Voltage Reference (0/2): 0,635
CPU GTL Voltage Reference (1/3): 0,635
CPU PLL Voltage: 1,56
FSB Termination Voltage (VTT): 1,32
NB Voltage: 1,30
NB GTL Reference: 0,635

Thank you in advance.

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