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i7 950 @ 4.3ghz issue

post #1 of 6
Thread Starter 
i just trying to oc from 4.2ghz to 4.3ghz and totally not stable at all , it casue the game crash ,and i can only view website , and somtimes windows just freeze but i can totally get stable with 4.2 / 1.325v, also both temp r not high , i just wonder why i cant get stable with 4.3? anyone got idea? thanks

my 4.3ghz setting below:
cpu ratio:21
bclk:205
dram:1643@ 8-8-8-24
uclk:3286
cpu voltage:1.375
qpi=1.325
dram voltage: i tried both 1.65 and 1.66 both dont work
and ht= off
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Hard DriveCoolingOSMonitor
Intel 520 Series 180GB SSD+WD Caviar Black 1TB ... RASA KIT EX360 WINDOWS 7 64 BIT Acer GD235HZ 120HZ 
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post #2 of 6
Try QPI 1.35
post #3 of 6
what is your NB IOH voltage? bump that to 1.26v if it does help..
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post #4 of 6
Thread Starter 
thanks guys i will try to raise the qpi ,but i left NB IOH voltage auto, is that problem cause my oc unstable??
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I7-3930K@4.6GHZ ASUS RAMPAGE IV EXTREME EVGA GTX680 SLI Corsair Vengence DDR3 16GB 1600@8-8-8-24 
Hard DriveCoolingOSMonitor
Intel 520 Series 180GB SSD+WD Caviar Black 1TB ... RASA KIT EX360 WINDOWS 7 64 BIT Acer GD235HZ 120HZ 
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CORSAIR AX1200 COOLERMASTER HAF X-942 
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My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
I7-3930K@4.6GHZ ASUS RAMPAGE IV EXTREME EVGA GTX680 SLI Corsair Vengence DDR3 16GB 1600@8-8-8-24 
Hard DriveCoolingOSMonitor
Intel 520 Series 180GB SSD+WD Caviar Black 1TB ... RASA KIT EX360 WINDOWS 7 64 BIT Acer GD235HZ 120HZ 
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CORSAIR AX1200 COOLERMASTER HAF X-942 
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post #5 of 6
Thread Starter 
unfortunally, i adjust qpi to 1.35v and IOH to 1.26 cant get stable for gaming also , i think i might change back to 4.2ghz ..............
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
I7-3930K@4.6GHZ ASUS RAMPAGE IV EXTREME EVGA GTX680 SLI Corsair Vengence DDR3 16GB 1600@8-8-8-24 
Hard DriveCoolingOSMonitor
Intel 520 Series 180GB SSD+WD Caviar Black 1TB ... RASA KIT EX360 WINDOWS 7 64 BIT Acer GD235HZ 120HZ 
PowerCase
CORSAIR AX1200 COOLERMASTER HAF X-942 
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My System
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CPUMotherboardGraphicsRAM
I7-3930K@4.6GHZ ASUS RAMPAGE IV EXTREME EVGA GTX680 SLI Corsair Vengence DDR3 16GB 1600@8-8-8-24 
Hard DriveCoolingOSMonitor
Intel 520 Series 180GB SSD+WD Caviar Black 1TB ... RASA KIT EX360 WINDOWS 7 64 BIT Acer GD235HZ 120HZ 
PowerCase
CORSAIR AX1200 COOLERMASTER HAF X-942 
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post #6 of 6
I have a barrier between 4.2 and 4.3 as well. It manifests in 21x and 23x for sure. With my particular chip, I can run 4.2 at 1.3X volts, but it takes 1.45 or more to get to 4.3 stable, and 4.4 requires 1.5X just to fail OCCT. My last 950 (R.I.P.) had a similar barrier between the 4.3 and 4.4 clocks, where it took 0.15 or more to make the jump.

Like you, I have settled on 4.2 for 24/7. I am still trying to find a higher clocked sweet spot, but I've become gun shy after burning a mobo AND a CPU at the same time during a 4.5GHz stress test at 1.53v core.

With two video cards, there is no reason to run IOH over 1.2 volts. You are playing with relatively low QPI and CPU voltages for being in the 4's, so focus on those.

Edit:
Try undervolting your CPU PLL by a tenth or two. Some people have found stability as low as 1.4v PLL at our speeds. I've recently lowered mine to 1.7v and will continue to test, as I want a 4.4GHz clock for 24/7 that doesn't break the 1.40v mark under load as measured with a volt meter.
Edited by ZeusBoltThrower - 2/25/11 at 4:36am
     
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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 
GraphicsGraphicsGraphicsRAM
#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 
AudioOtherOtherOther
Razer 7.1 Tiamat My soul My marriage ePeen 
CPUCPUMotherboardGraphics
i7-950 XSPC Raystorm Rampage iii Gene GTX 570 SC 
GraphicsGraphicsGraphicsRAM
GTX 570 SC EK 580 EK 580 Corsair Dominator DDR3 12gb 
Hard DriveOptical DriveCoolingCooling
Samsung 240GB SSD 850 EVO Samsung Slim DVDR  Alphacool radiator XSPC DDC/res 
CoolingOSPowerCase
Tygon 12mm Windows 7 x64 EVGA Supernova 650 P2 Aerocool DS-Cube mATX 
CPUMotherboardGraphicsRAM
q9650 790i ftw gtx 770 OCZ 8GB 2000 
Hard DriveCoolingOSPower
WD caviar black 1tb cooler master evo Windows 7 x64 thermaltake toughpower 750 
Case
nzxt silent 
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