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Right VTT Voltage For OC.

post #1 of 9
Thread Starter 
I am having problems getting my system to stay stable at 4.9 GHz.With the ram at its stock setting the system runs stable 24/7 but when I OC the ram to 2133 9-11-10-28 2T it goes for about 12 hours then freezes up.Right now I have my VTT set at 1.129 Volts.My CPU is a i5 2500k and my ram is Gskill snipers.My MB is a ASRock P67 Extreme4 Gen 3 with BIOS 2.10 version.

So what do you guys think I need to change to get the ram stable?Is that VTT Voltage that I have it set to right or should I change it?
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post #2 of 9
I had it at about 1.15V for my testing (4.8GHz, 2x4Gb 1866).
post #3 of 9
Thread Starter 
Quote:
Originally Posted by stahlhart View Post

I had it at about 1.15V for my testing (4.8GHz, 2x4Gb 1866).

I changed the CL to 10 and I have the VTT at 1.129 volts I don't have heat issues so do you think I should bump it to 1.150 volts?
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post #4 of 9
That setting worked for me for 24 hours of Prime95. I think that I had PLL at about 1.84V as well, and those were the only voltages I needed to bump to get it stable. It ran a little bit warmer as a result. I also took LLC out for the testing, and manually set my RAM timings (no XMP).

edit: -0.01 from initially stated PLL
Edited by stahlhart - 1/23/13 at 11:55am
post #5 of 9
Thread Starter 
Quote:
Originally Posted by stahlhart View Post

That setting worked for me for 24 hours of Prime95. I think that I had PLL at about 1.85V as well, and those were the only voltages I needed to bump to get it stable. It ran a little bit warmer as a result. I also took LLC out for the testing, and manually set my RAM timings (no XMP).

Here is my current setup.

BIOS 4.9 GHz CPU 24/7 Stable. ASRock P67 Extreme4 Gen3 Mother Board.

CPU Ratio 49
Internal PLL Over voltage Enabled
Intel Speedstep Technology Enabled
Turbo Boost Power Limit Manual
Short 250
Long 250
Long Duration 1 Second
Additional Turbo Voltage Auto
Core Current Limit 250
BCLK 100 MHz
Spread Spectrum Disabled
CPU Core Voltage Fixed Mode
Fixed Voltage 1.455 Volts
CPU LLC Level 1
DRAM Voltage 1.668 Volts
PCH Voltage Auto
CPU PLL Voltage Auto
VTT Voltage 1.129 Volts
VCCSA Voltage Auto
Enhanced Halt State(C1E) Enabled

Ram 10-11-10-28 2T 2133 MHz 1.668 Volts
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post #6 of 9
Quote:
Originally Posted by langer1972 View Post

Here is my current setup.

BIOS 4.9 GHz CPU 24/7 Stable. ASRock P67 Extreme4 Gen3 Mother Board.

CPU Ratio 49
Internal PLL Over voltage Enabled
Intel Speedstep Technology Enabled
Turbo Boost Power Limit Manual
Short 250
Long 250
Long Duration 1 Second
Additional Turbo Voltage Auto
Core Current Limit 250
BCLK 100 MHz
Spread Spectrum Disabled
CPU Core Voltage Fixed Mode
Fixed Voltage 1.455 Volts
CPU LLC Level 1
DRAM Voltage 1.668 Volts
PCH Voltage Auto
CPU PLL Voltage Auto
VTT Voltage 1.129 Volts
VCCSA Voltage Auto
Enhanced Halt State(C1E) Enabled

Ram 10-11-10-28 2T 2133 MHz 1.668 Volts

I'd disable PLL overvoltage unless you can't post at this multiplier. Apart from that, I'm using the offset method, so I'm not sure how much more I can assist... might have to manually set CPU PLL.
post #7 of 9
Thread Starter 
I will see what happens for now at the settings that I have.If it does not work I will try to disable PLL overvoltage and see what that does.
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G Skill Sniper 8 Gigs 1600 MHz Crucial M4 64GB SATA III  Seagate Barracuda 1TB 7200 RPM Seagate Barracuda 1TB 7200 RPM  
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80 CFM Fan In Window With 90 Deg Vent Winter Windows 7 Ultimate SP 1 x64 Asus VE245 1080P Razer Lycosa Mirror Edition 
PowerCaseMouseMouse Pad
1200 Watt Antec True Power Quattro Corsair 800D 8 Fans Full Blast Razer Abyssus Razer Vespula 
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post #8 of 9
You might also want to consider taking a shot at using an offset for Vcore at some point -- it might help you keep temperatures (and fan noise) down, if you're so inclined.

Good luck...
post #9 of 9
Thread Starter 
Quote:
Originally Posted by stahlhart View Post

You might also want to consider taking a shot at using an offset for Vcore at some point -- it might help you keep temperatures (and fan noise) down, if you're so inclined.

Good luck...

I use fixed Vcore for folding.
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7.1 CH HD Audio With THX TruStudio™ Logitech H390 USB Headset Logitech 5.1 X-530 & Sony MDR-V150 Dynamic Ster... Rheobus Extreme 6 Speed Fan Controller 
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Intel Core 2 Duo E4400 2 GHz Intel D946GZIS On Board 3 Gig's Kingston PC2-5300 
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i5 2500k 4.7 GHz Asrock P67 Extreme 4 Gen 3 BIOS 2.10 XFX Radeon HD 6950 2GB  XFX Radeon HD 6950 2GB  
RAMHard DriveHard DriveHard Drive
G Skill Sniper 8 Gigs 1600 MHz Crucial M4 64GB SATA III  Seagate Barracuda 1TB 7200 RPM Seagate Barracuda 1TB 7200 RPM  
Hard DriveOptical DriveOptical DriveCooling
Seagate Backup Plus 1TB USB 3.0 LITE-ON 24X DVD/CD LITE-ON 24X DVD/CD 5,000 BTU AC & NH-D14 Summer 
CoolingOSMonitorKeyboard
80 CFM Fan In Window With 90 Deg Vent Winter Windows 7 Ultimate SP 1 x64 Asus VE245 1080P Razer Lycosa Mirror Edition 
PowerCaseMouseMouse Pad
1200 Watt Antec True Power Quattro Corsair 800D 8 Fans Full Blast Razer Abyssus Razer Vespula 
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7.1 CH HD Audio With THX TruStudio™ Logitech H390 USB Headset Logitech 5.1 X-530 & Sony MDR-V150 Dynamic Ster... Rheobus Extreme 6 Speed Fan Controller 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E4400 2 GHz Intel D946GZIS On Board 3 Gig's Kingston PC2-5300 
Hard DriveOptical DriveCoolingOS
Western Digital 160 Gig Writemaster DVD/CD R&W Stock Intel Windows Vista SP 2 x86 
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I-INC iF171A HP KB-0316 BFG 450 Watt Black 
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