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First time overclocking

post #1 of 9
Thread Starter 
Hello everyone,

I've put together a new gaming machine 2 days ago.

Specs:

Asus Sabertooth P67 motherboard
Intel Core i5 2500K processor
8 gigs ( 2 x 4 gig sticks ) Corsair Vengeance RAM 1600 MHz
Noctua NH-D14 cooler

Today I started playing with the BIOS for the first time trying to overclock the new processor, shooting for 4.5 GHz ( this is my first time overclocking ) and I have a few questions.

I used Clunk's guide I found on the net, put the settings in BIOS following the guide and booted into Windows. First I set the Vcore to 1.25v and tried to run Prime95 but got a BSOD almost instantly. I've bumped the Vcore some more and in the end had to settle with 1.32v if I wanted Prime to run for more than 1 minute without BSODing. I left it run for 1 hour while checking the temps with Coretemp, min was 32C while max was 76C.

Are these temps OK or are they to high ?

One interesting thing I noticed is that although I set the Vcore to 1.32v in the BIOS, in CPU-Z it never got above 1.232v. Why is there such a difference between CPU-Z readings and the BIOS setting ?
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Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
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Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
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post #2 of 9
those temps seem a little high for 1.32 v-core and a NH-D14... what are your ambient temps?

Also, your BIOS setting for v-core is what you're getting at idle, correct? Then once you run Prime 95 the voltage reading in CPU-Z drops? This is known as v-droop, and is corrected by Load-Line Calibration (LLC)

You can adjust your LLC level to get your load v-core as close as possible to your idle v-core. Be careful not to set the LLC too high, as you will experience voltage spikes.
post #3 of 9
Thread Starter 
Yup you're right, 1.32 v-core is at idle and as soon as I start Prime it drops to 1.232, well really it fluctuates between 1.224 and 1232.

My ambient temp is 22C.

I used AS5 and I read that it needs about 200 hrs to reach its maximum thermal conductivity so I can expect those temps to drop by a couple of degrees later down the road, right ?

I'll look into the LLC setting and will try to adjust it so the idle and load v-core are as close as possible.

What are the safe max temps for the 2500K ? Should I be worried since mine go up to 76C ?
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CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
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Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
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My System
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CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
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Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
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post #4 of 9
waiting that 200 hrs will really only make a 1-2C difference. You may have put either too much or not enough TIM when you installed the NH-D14.

76C isn't anything to be too worried about, but it is higher than normal for most 2500K/NH-D14 users.
post #5 of 9
Thread Starter 
I did some more fiddling with the settings in BIOS and I noticed that I left the Internal PLL overvoltage on auto by mystake. I disabled it and I managed to lower the v-core to 1.25 and not BSODing while runing Prime. I'm now pass the 1 hour mark without any BSOD or errors.

I've set the LLC to ultra high and now the v-core shown in CPU-Z is more true to the one I set in the BIOS. CPU-Z shows the v-core at 1.248 with spikes to 1.256 and drops to 1.240 which is way less fluctuation than it was before. Min temps 27C / Max 75C.

I figured I can just leave Prime runring over night and hopefully it will still be running error free once I come back home.

Tnx for the suggestion moop, I'll look into it, will pull out the cooler and check if TIM is properly applied once I get back from work ( my night shift is about to start ).
Edited by bldybstrd - 10/13/11 at 1:51pm
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
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Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
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Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
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post #6 of 9
Thread Starter 
I followed your suggestion moop, I took out the cooler and wiped the TIM off it and the CPU ( it did seem like I put more paste than needed ) and reapplied the paste following the instructions I found on the arctic silver site. I've put a vertical line through the center of the CPU as opposed to the method I used before which was dropping a rice grain size of paste in the middle and then spreading it even accros the CPU with an old credit card.

I re-mounted the heatsink, turned on the computer and did a stress test using Prime blend for an hour while monitoring temps with Coretemp and min was 27C while max never got over 65C. That's a 10C drop in max temps compared to what I had before. Is this more within the norm or are my temps still a bit on the high side ?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
KeyboardPowerCaseMouse
Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
Mouse Pad
Razer Destructor 
  hide details  
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
KeyboardPowerCaseMouse
Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
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post #7 of 9
That is much much better

those temps are well within the normal range now
post #8 of 9
Thread Starter 
Tnx for the help mate, appreciate it. Now I'm ready to go a bit higher, I'm hoping for 4.8 Ghz with temps not going over 75C. Will let you know how that turns out.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
KeyboardPowerCaseMouse
Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
Mouse Pad
Razer Destructor 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
KeyboardPowerCaseMouse
Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
Mouse Pad
Razer Destructor 
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Reply
post #9 of 9
Thread Starter 
So I upped the multi to 48 and had to settle with 1.32 vcore as anything below that gave me a BSOD, error 101, as soon as I started Prime.

After letting Prime blend run for 30 min my temps went to 77C max, low on idle was around 32C. What do you think ? Temps seem to be a little on the high side.

My vcore on load was mostly 1.312, occasionally reaching 1.32 and going as low as 1.304.

Here are my BIOS settings, feel free to comment and let me know if you think I should change anything:

AI Overclock Tuner - Manual
BCLK/PEG frequency - 100
Turbo Ratio - By All Cores
EPU Power Saving Mode - Disable
VRM Frequency - 350
CPU Current Capability - 140%
CPU PLL Overvoltage - Disabled
Load-Line Calibration - Ultra High
Phase Control - Extreme
Duty Control - Extreme

CPU Voltage - 1.320
DRAM Voltage - 1.50
VCCSA - Auto
VCCIO - Auto
CPU PLL Voltage - 1.60
PCH Voltage - Auto
CPU Spread Spectrum - Enabled

CPU Ratio - Auto
Intel Adaptive Thermal Monitor - Enabled
Active Processor Cores - All
Limit CPUID Maximum - Disabled
Execute Disable Bit - Enabled
Enhanced Intel Speedstep Technology - Enabled
Turbo Mode - Enabled
CPU C1E - Enabled
CPU C3 Report - Auto
CPU C6 Report - Auto


I don't feel really comfortable running with these temps 24/7 so I think I'll have to settle with 4.5Ghz @ 1.25 vcore.

Also what I noticed while monitoring the temps with Coretemp is that the power feeded to the CPU can go up to 114W durring Prime. Is this normal ?
Edited by bldybstrd - 10/19/11 at 10:54am
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
KeyboardPowerCaseMouse
Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
Mouse Pad
Razer Destructor 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 2500K @ 4.5 Ghz Asus Sabertooth P67 B3 rev 2x Radeon HD 5850 crossfire Corsair Vengeance 1600 Mhz 8 GB 
Hard DriveOptical DriveOSMonitor
Samsung Spinpoint F1 1TB TSSTcorp CD/DVDW SH-S183L Windows 7 Ultimate 64bit SP1 Samsung Syncmaster 2253BW 
KeyboardPowerCaseMouse
Logitech G15 Corsair Enthusiast Series TX850W 80+ Cooler Master HAF 932 Logitech G500 
Mouse Pad
Razer Destructor 
  hide details  
Reply
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