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QPI voltage high under XMP...VERY high under "auto"

post #1 of 8
Thread Starter 
I got some GEIL 2133mHz memory in the mail today. Rolling back OC's and setting things to "Auto" things work great-apart from manually setting the frequency. RAM is spec'd at 1.65V CL9 3X2GB.

Then I went to see what "Auto" did. Bear in mind the following is a stock frequencies on the CPU.

Under "Auto", my QPI/DRAM voltage (what ASUS BIOS calls CPU-VTT I believe) is set to 1.525V! Now this is seems way high to me. Under gaming things run fine. But when trying to do folding I get a 124 BSOD within 10 minutes!

Under XMP, my QPI voltage is set to 1.40 volts...and my computer will not pass POST. Nevermind get to Windows to spit BSOD stop codes at me.


What do you guys think? Am I pushing my luck and life of my gear with the Auto QPI/DRAM voltage of 1.525?
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post #2 of 8
Don't use XMP profiles. They tend to set dangerous levels of QPI/VTT and use sub-timings so lose that you lose any benefit from higher clocked memory.

Edit: Is that a quad or hex core 1366 chip you are using? For DDR3-2133 to work on a quad you'd need to run 4.27GHz uncore, which is unlikely to happen without massive QPI/VTT.
Edited by Blameless - 1/8/11 at 6:14pm
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by Blameless View Post
Don't use XMP profiles. They tend to set dangerous levels of QPI/VTT and use sub-timings so lose that you lose any benefit from higher clocked memory.
And what of the auto settings? similar ruling? I'm suspicious because I got a 124 BSOD and I thought that was too little CPU-VTT whatever.
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post #4 of 8
That is frequently, but not always, too low QPI/VTT.

Honestly, with a Bloomfield, I would be amazed if you ever stabilized DDR3-2133 with any QPI/VTT voltage that was remotely safe for extended use.
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post #5 of 8
Blameless, what is your QPI/VTT running at with your Patriot memory? I have the same set (PX7312G2000ELK) that you have in your sig, but have not been able to run above ~1920MHz. Haven't pushed my uncore voltage past 1.45v, XMP is another 0.2v beyond that. Vdimm is at 1.65625, multi downclocked to 21x, core at 1.3-ish.
     
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post #6 of 8
Quote:
Originally Posted by Skripka View Post
I got some GEIL 2133mHz memory in the mail today. Rolling back OC's and setting things to "Auto" things work great-apart from manually setting the frequency. RAM is spec'd at 1.65V CL9 3X2GB.

Then I went to see what "Auto" did. Bear in mind the following is a stock frequencies on the CPU.

Under "Auto", my QPI/DRAM voltage (what ASUS BIOS calls CPU-VTT I believe) is set to 1.525V! Now this is seems way high to me. Under gaming things run fine. But when trying to do folding I get a 124 BSOD within 10 minutes!

Under XMP, my QPI voltage is set to 1.40 volts...and my computer will not pass POST. Nevermind get to Windows to spit BSOD stop codes at me.


What do you guys think? Am I pushing my luck and life of my gear with the Auto QPI/DRAM voltage of 1.525?
You are probably not able to run your RAM at that speed because the NB Frequency is too high for your IMC. Many people are not able to run their ram at 2000MHz without a proposterous amount of QPI Voltage. For mine, the cutting off point for 2000mhz/ 4ghz uncore is 1.48VTT/QPI.

I personally wouldn't run it over 1.4v (QPI) for 24/7, but it all depends on what you are comfortable with. 1.52 for 24/7 seems way too high.

Your CPU's IMC is most likely at fault. The uncore requirement is very high for a quad core, and as a result, it will require a large amount of QPI/VTT voltage.

Also my RAM's XMP setting set the QPI/VTT to 1.6v (an effective voltage of 1.55V). I unknowingly ran it at this setting for a couple weeks. Again, for this particular CPU, the NB Frequency required for that RAM speed is just way too high without more voltage. DO what you are comfortable with. For me, the max is 1.4v but thats subjective.

I run my 950 QPI/VTT at 1.35v for 1600MHz of RAM but it allows me to run my uncore at 3.8ghz.

An increase in 200mhz to my uncore makes it stable without a tonne of added voltage.
Edited by dTT05 - 1/24/11 at 7:52am
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post #7 of 8
Quote:
Originally Posted by ZeusBoltThrower View Post
Blameless, what is your QPI/VTT running at with your Patriot memory? I have the same set (PX7312G2000ELK) that you have in your sig, but have not been able to run above ~1920MHz. Haven't pushed my uncore voltage past 1.45v, XMP is another 0.2v beyond that. Vdimm is at 1.65625, multi downclocked to 21x, core at 1.3-ish.
I'm running a Gulftown and thus only need 1.5x DDR speed on the uncore. I run 3.2GHz uncore with 1.295v with my memory at the settings in my sig.

If you have a Bloomfield (any 1366 i7 below the 970) you will need to run the uncore much higher in order to use DDR3-2000.
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post #8 of 8
Quote:
Originally Posted by Blameless View Post
I'm running a Gulftown and thus only need 1.5x DDR speed on the uncore. I run 3.2GHz uncore with 1.295v with my memory at the settings in my sig.

If you have a Bloomfield (any 1366 i7 below the 970) you will need to run the uncore much higher in order to use DDR3-2000.
Ah, that makes a huge difference. Trying to squeeze 4GHz+ on the uncore is where the application of voltage gets scary. I'm sure I'll get there eventually, I'm close (192 BCLK) but not "there" yet. Haven't had the scro to put more than 1.45v on the Vtt, even with the multiple kilowatt cooling system I run. The LN2 crowd insists that voltage can be pushed well past the 1.6v that the XMP demands, but I don't know if anyone who has claimed such ever keeps a CPU/Mobo running for enough time to find out what the long term effects are. I need 2 years from this system, but that 2 years will be cut in half if I can't get the speed to make it worthwhile.
     
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CPUCPUMotherboardGraphics
i7 980 195/4485/1.36v (24/7), 200/4600/1.38v (OC) EKWB Asus Rampage III Formula #1 Asus GTX 690 
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#2 Asus GTX 690 #1 EK 690 w/BP #2 EK 690 w/BP 12GB Patriot Viper Extreme PC16000 3x4GB @2000 MHz 
RAMHard DriveHard DriveHard Drive
MIPS RAM cooler nickel acetal Force GS249 SSD 2TB Caviar Green 2TB Caviar Green 
Hard DriveHard DriveOptical DriveCooling
1TB Caviar Black 1TB Caviar Black What? Water, 8x120mm in dual-loop, 1/2" Tygon, common... 
CoolingCoolingCoolingCooling
EK D5 top EK D5 top Swiftech 360 swiftech 120 
CoolingCoolingCoolingCooling
swiftech 240 swiftech 240 D5 vario D5 vario 
CoolingOSMonitorMonitor
Bitspower reservoir Win7P Legit Ergotron triple stand #1 Dell U2410 
MonitorMonitorKeyboardPower
#2 Dell U2410 #3 Dell U2410 Razer Lycosa CM Silent Pro Gold 1200w 
CaseMouseMouse PadAudio
CM ATCS 840 modded Razer Deathadder Razer precision Asus Xonar DX 
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Razer 7.1 Tiamat My soul My marriage ePeen 
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i7-950 XSPC Raystorm Rampage iii Gene GTX 570 SC 
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GTX 570 SC EK 580 EK 580 Corsair Dominator DDR3 12gb 
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Samsung 240GB SSD 850 EVO Samsung Slim DVDR  Alphacool radiator XSPC DDC/res 
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Tygon 12mm Windows 7 x64 EVGA Supernova 650 P2 Aerocool DS-Cube mATX 
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q9650 790i ftw gtx 770 OCZ 8GB 2000 
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WD caviar black 1tb cooler master evo Windows 7 x64 thermaltake toughpower 750 
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nzxt silent 
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