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Help with 950 Vcore

post #1 of 18
Thread Starter 
Hi guys and girls if there's any on here new to the forums and to overclocking, I know the basics anyway I recently built a new rig and started to dabble in overclocking.

Im trying to get my 950 to a stable 4.0Ghz.
I have tried to different ways 174 BLK x23 multi and 191 BLK x 21 multi both with QPI/VVT@1.175v and DRAM@1.66v with my Vcore@1.35v and lower and I cant boot or I bsod if i try OCCT test it. I can get to 3.8Ghz with a Vcore of 1.26v but have to up it so much to push to 4Ghz.

I need help trying to get stable with less volts the temps are ok but i dont like using that much voltage when I have seen people clocking 4Ghz on a 1.25-1.30 vcore.

Any help would be greatly appreciated! Cheers!
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The Stormtrooper
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post #2 of 18
I have a "rule" ... that's going 1.30v on vcore and qpi ... and from there raise or lower your vcore until it's stable. When you find your stable vcore, you go for qpi and begin lowering it until it's stable.

I don't know about you qpi's... but mine is @ 1.275v ... and my vcore @ 1.20 ...
If i lower it, i just can't get the system stable. and this, without HT ...
post #3 of 18
Might want to try a quick test of 175x23 BUT, turn everything else to auto, including the CPU voltage. If that'll boot, look at something like CPU-Z, and write down the settings it has for RAM and voltage. Go back to BIOS and manually use those. It is really only a temporary setup, but if it works, you'll have a baseline.
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post #4 of 18
Thread Starter 
So you suggest raising my qpi then adjust accordingly, Ill give that a go tomorrow. Is there any difference using a lower or higher multi? like is it better to use x21 over x23?
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The Stormtrooper
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post #5 of 18
vcore = 1.30v
QPI/VTT = 1.335v
IOH = 1.20v
ICH = 1.20v
CPU PLL = 1.88v
DRAM = 1.640v

use with 191x21, make sure to disable any speedstep/C1E/EIST settings in the BIOS

if that posts and passes ~1 hour of prime 95, lower the vcore/VTT and see where the soft spot is

the 23x (sweet spot on a 950) is all lies, it doesn't work any better than 21x for a 4Ghz OC however it does help going beyond the 4.50Ghz mark when FSB/BLCK walls start setting in
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post #6 of 18
Quote:
Originally Posted by TheCraven View Post
Might want to try a quick test of 175x23 BUT, turn everything else to auto, including the CPU voltage. If that'll boot, look at something like CPU-Z, and write down the settings it has for RAM and voltage. Go back to BIOS and manually use those. It is really only a temporary setup, but if it works, you'll have a baseline.
Don't do this ^.

You should never trust your motherboard to properly adjust your voltages for you when you OC. This is especially true since we do not know what you're mobo you're using. (Unless it's the X58 in your sig, but nevertheless)

Do you mind getting a print out of your BIOS settings? Could you also let us know the make and model of your RAM, and show us your RAM timings? Stuff like this could easily affect your stability-- don't just be looking at the chip.
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post #7 of 18
Thread Starter 
If i change the vvt at all it fails to boot. Dont want to sound like a noob but how do i get a print out of my bios? and yes Im on the comp in my sig.
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The Stormtrooper
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post #8 of 18
Quote:
Originally Posted by Plex View Post
Don't do this ^.

You should never trust your motherboard to properly adjust your voltages for you when you OC. This is especially true since we do not know what you're mobo you're using. (Unless it's the X58 in your sig, but nevertheless).
Lol, I suppose my fire extinguisher did get a workout, putting out the massive flash fire from my PC. Oh, wait...that didn't happen. Unless you're running a major brand, store bought PC, and really pushing it, this shouldn't cause a problem. Boards built with OC features can function somewhat on their own. But, maybe I was just lucky.

If you're really worried, then just try to start high manually, around 1.35 volts. Even BCLK (174), odd multiplier(23), and all else to auto.

As for the print out, use this template and fill it in for everyone: http://www.overclock.net/intel-mothe...-920-bsod.html (Thanks to Kick for that link)
Edited by TheCraven - 12/20/10 at 8:10pm
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post #9 of 18
Thread Starter 
I think this is all right

Ai Overclock Tuner.....................[Manual]
CPU Ratio Setting......................[21.0]
Intel(r) SpeedStep(tm) Tech............[Disabled]
Xtreme Phase Full Power Mode...........[Enabled]
BCLK Frequency.........................[191]
PCIE Frequency.........................[100]
DRAM Frequency.........................[DDR3-1528MHz]
UCLK Frequency.........................[3820MHz]
QPI Link Data Rate.....................[Auto]

CPU Voltage Control....................[Manual]
CPU Voltage............................[1.35000]
CPU PLL Voltage........................[1.80]
QPI/DRAM Core Voltage..................[1.175]
IOH Voltage............................[1.10]
IOH PCIE Voltage.......................[1.50]
ICH Voltage............................[1.10]
ICH PCIE Voltage.......................[1.50]
DRAM Bus Voltage.......................[1.66]
DRAM DATA REF Voltage on CHA...........[Auto]
DRAM CTRL REF Voltage on CHA...........[Auto]
DRAM DATA REF Voltage on CHB...........[Auto]
DRAM CTRL REF Voltage on CHB...........[Auto]
DRAM DATA REF Voltage on CHC...........[Auto]
DRAM CTRL REF Voltage on CHC...........[Auto]

Load-Line Calibration..................[Enabled]
CPU Differential Amplitude.............[800mV]
CPU Clock Skew.........................[Delay 300ps]
CPU Spread Spectrum....................[Disabled]
IOH Clock Skew.........................[Auto]
PCIE Spread Spectrum...................[Disabled]

C1E Support............................[Disabled]
Hardware Prefetcher....................[Enabled]
Adjacent Cache Line Prefetch...........[Enabled]
Intel(r) Virtualization Tech...........[Disabled]
CPU TM Function........................[Enabled]
Execute Disable Bit....................[Enabled]
Intel(r) HT Technology.................[Enabled]
Active Processor Cores.................[All]
A20M...................................[Disabled]
Intel(r) SpeedStep(tm) Tech............[Disabled]
Intel(r) C-STATE Tech..................[Disabled]
The Stormtrooper
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60Gb OCZ Vertex 2 OS, 3x1Tb WD Cavier Black Samsung Blueray Win 7 Ultimate 64bit 27" BenQ, 24" BenQ 
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Corsair HX-1000 NZXT Phantom 
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The Stormtrooper
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CPUMotherboardGraphicsRAM
i7 950 Gigabyte GA-X58A-UD5 Gigabyte GTX 580 6Gb Corsair Dominator 1600Mhz 
Hard DriveOptical DriveOSMonitor
60Gb OCZ Vertex 2 OS, 3x1Tb WD Cavier Black Samsung Blueray Win 7 Ultimate 64bit 27" BenQ, 24" BenQ 
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post #10 of 18
Looks alright. I've never changed PCIE voltages, I wonder how well that improves on stability? If it runs fine, try bringing the multi back to 23, and lower the bclk. Makes it less laggy/glitchy in my experience.
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Turn 'n Burn
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Hard DriveOptical DriveCoolingOS
Intel 520 60GB + 2x 1TB HDD Asus BD-R Spire Thermax Eclipse II Win7 64-Bit 
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Corsair K90 Thermaltake 850W Modular NZXT Phantom Cyborg R.A.T. 7 Contagion 
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