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

  1. #651
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    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
    Intel Core 2 Q9650@3800MHZ 1.25Vcore 435FSB/Asus Maximus II Formula/4GB G.Skill F2-8000 CL5/Nvidia GTX 280/VelociRaptor 300GB/Samsung HD753LJ F1 750GB/Sb X-Fi Fatality/Pioneer 110D/Nec 3520A/Cooler Maser Stacker STC-T01 MOD/LCD 22"Wide HP w2207h/Alice 7MB->Netgear DG834GITIT

  2. #652
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    ^ 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 View Post
    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.
    Last edited by CryptiK; 01-04-2010 at 09:59 AM.

  3. #653
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    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
    Last edited by yeahoo; 01-08-2010 at 11:15 PM.

  4. #654
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    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.

  5. #655
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    Hello, people!
    two days I can not adjust the FSB 533, Prime95 is not stable.... 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

  6. #656
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    Quote Originally Posted by Saturn™ View Post
    FSB Termination Voltage: 1.21
    Your VTT might be a bit low for 533FSB.


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  7. #657
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    Quote Originally Posted by Saturn™ View Post
    Hello, people!
    two days I can not adjust the FSB 533, Prime95 is not stable.... 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.

  8. #658
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    I assign values up to 1.38! Prime95 falls after a few minutes.

  9. #659
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    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.

  10. #660
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    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 ...
    Last edited by Saturn™; 02-20-2010 at 06:02 AM.

  11. #661
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    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.

  12. #662
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    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
    DFI LT X48 T2R - BIOS UT CDC24@ Liquid Cooled | Q6600@ 3.2ghz 1.184v - VID 1.2000v | 4GB OCZ-BLADE@ 1200mhz CL5 PL5 1.74v | ASUS HD5770@ 1050/1350 - 1.264v
    2x160GB Raid 0 | X-Fi Titanium + Logitech X-540 | Antec 1200 MOD | SAMSUNG 2232BW 22" 1680x1050 | TAGAN 800W


    Sorry for my bad English, but i'm Italian...

  13. #663
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    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.

  14. #664
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    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
    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?
    Last edited by sheri; 04-26-2010 at 09:44 AM.
    Quote Originally Posted by S_A_V View Post
    I not bench on unprepared rig, so I decided to stop trying and go drink beer instead of making some crap results.
    Still getting there


  15. #665
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    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

  16. #666
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    Quote Originally Posted by CryptiK View Post
    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
    Thx , but on 1/3 i have to aim into 0.635x multi right?
    Quote Originally Posted by S_A_V View Post
    I not bench on unprepared rig, so I decided to stop trying and go drink beer instead of making some crap results.
    Still getting there


  17. #667
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    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.

  18. #668
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    Quote Originally Posted by sheri View Post
    Thx , 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 View Post
    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.

  19. #669
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    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?
    Last edited by Willhub; 05-27-2010 at 06:26 AM.

  20. #670
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    Anyone know how to use the GTL Calculator?

  21. #671
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    Can someone help please?

    I don't get this:

    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

  22. #672
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    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.

  23. #673
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    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!
    Last edited by h0t; 08-13-2011 at 08:13 AM.

  24. #674
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    Can you help me setting my values?

    I have an Asus P5K Pro, E8400 E0, Gskill pc2-6400 1066 with this settings:

    CPU - 4140Mhz
    Bus Speed - 460Mhz
    Rated FSB - 1840Mhz
    FSB Strap to NB - 333Mhz
    Multi - 9x

    img9877r.jpg

    I still didn't manage to understand the GTL reference voltage.

    Can those values be correct?

    For cpu gtl i have these options 0.57x; 0.59x; 0.61x; 0.63x; Auto
    For NB gtl i have these options 0.61x; 0.67x, Auto

    As i have vCore and vNB and FSB Termination Voltage a little bit raised i have chosen lower values for CPU and NB GTL reference voltages. Is this correct??

    Cheers
    E8400 @ 4.15Ghz @ 1.37500v @ BIOS | 1.344v @ CPU-z
    Asus P5K Pro
    GSkill PC2-8400 1069Mhz @ 5-5-5-15 | 2.02v
    TG Xtreem PC5300 @ DDR2-800Mhz @ 3-3-3-8 @ 2.20 (resting)
    Sapphire HD6870 1Gb GDDR5 256bit @ 955Mhz/4288Mhz stock vGPU
    Sapphire X1950XT 256Mb GDDR3 256bit @ 702Mhz/2000Mhz (resting)
    PSU LC Power 700Watt 4 12v rail @ 18A
    1 WD VelociRaptor 150Gb 10000rpm
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  25. #675
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    Thumbs up

    First of all sorry for necro bump


    Quote Originally Posted by Salty View Post
    You guys have helped a lot of overclockers with this thread



    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.
    -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.



    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. Will see if they help.




    HI
    so you could use both at normal up to 445mhz?

    Im still at Ga-x48-ds5 and I had the same Corsair dominator before, but mine was faulting at 1080mhz (even 2.25v).. 1075mhz was max stable (448mhz) with these settings fsb +0.15v, mch +0.300v, cpuv 1.3500v, llc off, gtlr1,2 - normal.
    Anything higher would report hw error in windows7 mem diagnostic tool - always between 23-28% per round (its testing either plus LRAD or Stride6 -cache enabled), while mem testx86 4.2 passed up to 1090mhz..




    Now i bought 4x 2gb Kingston HyperX 1066mhz and i can't run at 1080mhz or 450mhz fsb, mch +0.325, fsb +0.200v, cpuv 1.36250v, gtlr1,2 normal..

    5-5-5-15, extra advanced ram timings 5-6-10-74-6-perf.level 7-auto-2t. And it can make a system halt with high pitch sound..

    (these are mobo default extra timings at 445mhz+ 5-5-9-70-5-pl7-auto-2t, even at 455mhz)
    ---
    I can pass windows7 mem diagnostic tool up to ~ 1092mhz (455mhz) at those manual adv timings (including perf. level 7), but ingame benchmarks like Metro2033 (high mode, dof off, physx on) raises cpu cores ~75-98% (avg 90%) and when i see the most cpu usage (i monitor via g15 display) it can freeze with this high pitch sound - almost every time at 3rd repeat (or sometimes on 1st round)..
    ----

    The next game is Resident evil 5 dx10 (all max, 4xaa), 2nd fixed benchmark. Also cpu/mem bandwidth intense and same symptom as Metro2033, anything beyond 1080mhz or lower adv timings like 5-5-10-74-6-pl7-auto-2t causes system freeze -high pitch sound. At the most cpu/ram bandwidth intense parts (raising cpuv didnt help)
    -------

    Now my question is, should i change those GTLR1,2, will it smooth things out or help eliminate this halting?


    i use both GTLR1,2 at normal up to ~ 455mhz and always ended up with this high pitch sound. Even at mch +0.350v and cpu way higher then i use to with 4gb, but i didnt raise adv timings so much, yet.. (memory enhance : Turbo; LLC -Off in all cases)




    Quote Originally Posted by mikeyakame View Post
    It's because with 45nm chips they use a lower Vtt of 1.10v as default, same goes with P45 NB it uses a lower default voltage than the older X48/X38/P35 chipsets.

    The GTL0/3 and GTL1/2 aren't cores, they are mid/end GTL reference pins.

    0/3 are data bus pins. 1/2 are address bus pins. They are logic sampling voltages, taken mid swing and end swing.

    ...
    Hi

    Could one of those GTLR affect memory read/copy somehow as well? And what is what in Gigabyte's case

    GTLR1 data bus
    GLTR2 address bus
    ?


    Tnx both
    Last edited by The|Hunter; 12-17-2011 at 06:45 PM.
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