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i7 3820 Custom Loop Help - Page 4

post #31 of 32
Thread Starter 
Sorry to revive an old thread, but hoping to get a bit more advice.

I've got a 4.75 GHz stable OC. 125 BCLK, 38 multiplier, 1.350 VCore, CPU Load Line Calibration High.

I've notched up the multiplier to 39 to get a 4.875 GHz overclock. System boots into windows, allows me to open prime95, and crashed almost immediately.

I went back to the BIOS, notched the CPU VCore to 1.355 - PC boots and begins running Prime95, crashes about 30-45 seconds into test.

I went back to BIOS twice more, arriving at 1.365 VCore. Each time, Prime95 gets farther before the system crashes - 7 minutes before crash on 1.365

I noted your suggestion to adjust CPU LLC 1 step from high to ultra-high, and then tried extreme, since this is a 4.8GHz+ OC. With both of those settings, system failed to boot to windows (system reboot after Windows loading screen).

Since the higher voltages are getting me longer stable times in Prime95, is it safe to keep pushing pas 1.365 Vcore? This CPU expert seems to think it shouldn't go past 1.350 VCore.
Monolith
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Monolith
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post #32 of 32
Quoting from the overclock guide:-
Quote:
Step #3 Pick a good VCore: Warning! At or above 1.7v the CPU will DIE. From 1.5-1.69v the CPU will DEGRADE more quickly than below 1.5v. When a CPU degrades it is very easy to tell, as it will require more voltage than before for the same frequency. Once you reach your max OC your VCore might be higher than you want.
You can use more than 1.35V actually. CPU start to degrade if you push voltage more than 1.5V. To prevent your CPU from degrade quickly, I wouldn't go over 1.45V.

I kept voltage below 1.45V for a year (max 1.416V @4.75GHz) & I didn't noticed any degradation. It remain stable at the same voltage for the same frequency in that period. Only lately I did pushed above 1.6V (for benching). This resulted quicker degradation. Now I need additional 0.01V for the same frequency.
Edited by kizwan - 8/13/13 at 1:49pm
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Superhero Effect
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Hard DriveHard DriveOptical DriveCooling
WD WD6400AAVS 640GB 8MB SATA-II Caviar Green 2 x Plextor PX-M5S 128GB (RAID0) Liteon 12x Blu-ray Drive COMBO 2 x (EK-FC R9-290X - Acetal, EK-FC R9-290X Back... 
CoolingCoolingCoolingCooling
Koolance Ball Valve VLV-BL1X2 XSPC D5 Dual Bay Reservoir/Pump Combo Hardware Labs Black Ice GT Stealth 360mm Hardware Labs Black Ice SR-1 120 
CoolingCoolingCoolingCooling
XSPC EX240 2x120mm radiator 5 x Corsair SP120 High Performance 2 x Corsair SP120 PWM High Performance XSPC Raystorm 
CoolingCoolingOSMonitor
NZXT Sentry 2 fan controller PrimoFlex Advanced LRT 10ft Tubing - 7/16in. ID... Windows 10 Home 64-bit Samsung SyncMaster B2330H 23" 
MonitorKeyboardPowerCase
Philips 236G3DHSB 3D LCD LED 23" Razer BlackWidow Ultimate Seasonic X-1050 1050W Corsair Vengeance C70 Mid-Tower Gaming Case Gun... 
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CPUMotherboardGraphicsRAM
Intel Core i7 720QM Dell Studio 1557 Intel PM55 ATI Mobility Radeon HD 4500/5100 Series Samsung 2GB DDR3-1333 
RAMHard DriveOptical DriveCooling
Samsung 2GB DDR3-1333 Seagate ST9320325AS HL-DT-ST_DVD+-RW_GA11N Fan + Copper + Aluminum + Shin-Etsu G751 
OSMonitorKeyboardPower
Windows 7 Home Premium 64-bit 15.6" LCD (WXGA) InnoLux BT156GW01 Dell Studio 1557 Keyboard Dell 90W AC Adapter 
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