overclocking i5 2500k...im confused

Antman2000 · Jan 19, 2015

Sup doods im currently trying to get a stable overclock of 4.4 with an asrock p67 extreme6 and a 2500k and ive got it set to offset but no matter what i set it to the voltages to when im stress testing it always goes to 1.371 ive set it to +0.05 and ive even tried -0.05 but no matter what i set it to the the voltage goes up to 1.371 :S ive updated my motherboard bios but it just wont let me raise or lower the voltage no matter what i set it to...am i being stupid and missing a setting or is my board just busted in some way? ive read all the guides i can find but i seem to have no control over the voltage and i know this cpu should be running around 1.2 - 1.300ish tops for this sort of overclock.

other settings im using
spread spectrum - disabled
load line calibration set to 3
internal pll enabled
core limit min and max - 250
c3/6 states - disabled
everything else - auto

software - prime95, intel burn test. cpuz & coretemp

Darkbreeze · Jan 20, 2015

Do you have Speedstep disabled in the BIOS and have you manually selected a voltage setting or is the CPU voltage on auto? If you're overclocking you need to manually set the voltage or the system will overvolt the cpu for stability reasons regardless of whether it's thermally irresponsible or not.

Rocking Durgesh · Jan 20, 2015

Now just one option remained that to start the overclock again from factory settings. ..
Overclocking is a step by Step method. Don't overclock by any software because overclocking is not the thing that can be done by software. First set the XMP memory profile enabled to set your RAM correctly. Then Go in BIOS and find the CPU clock ratio, this is the multiplier setting. It starts at a multi of 35x 100(BCLK)(normal factory settings) to give you 3.5 Gigahertz. So up it .5 at a time and boot to os and test with P95 for stability and monitor your temps. Do this for approximately 20 minutes. If it passes raise the multi another .5 and try again. You'll get to a point where either P95 won't pass or your temp will gone so high. If the temps gone high you'll have to stop and work on cooling. If P95 fails then go to the Advanced voltage section in bios and add some volts to the CPU VCore . Stay in offset and just add a bit by tapping on the "+" key and test again.
A step you willarrive that Prime95 never pass or your temp gone high immediately. That step you have to stop and you get the extreme value of your processor. ...
Don't forget to select the best answer

Darkbreeze · Jan 20, 2015

Rocking Durgesh :

Maybe if you quit fishing for BA's and pay attention to the actual problem, you might have more than 5 of them. Your reply does not, in ANY way, address the question asked by the OP.

Darkbreeze · Jan 20, 2015

Also, check to see that you've DISABLED the Turbo boost feature. You don't want that enabled with a manual overclock and it might override your settings.

Darkbreeze · Jan 20, 2015

This thread might help you as well.

http://www.tomshardware.com/forum/276894-29-2500k-voltage-fixed-offset

Darkbreeze · Jan 20, 2015

Also, when you enter a new voltage setting, don't forget to hit Enter, to set the setting, and then save the settings when you exit bios.

Antman2000 · Jan 20, 2015

Darkbreeze :

i have not disabled the turbo boost feature is set to auto.

Antman2000 · Jan 20, 2015

Darkbreeze :

speedstep is not disabled, i like having it and i have the cpu offset at -5 atm just to see if it makes any difference, so far the voltages havnt changed at all infact it idles higher than it does on auto (over 1.000). Also adding additional turbo voltage +4 makes no difference it still tops at 1.371

Antman2000 · Jan 20, 2015

the only thing that seems to make a difference is load line calibration the higher i set it the hotter the cpu primes at regardless of voltage :S

bicycle_repair_man · Jan 20, 2015

My advice would be to stop what you're doing and have a read of this guide; http://www.tomshardware.co.uk/forum/272214-29-wolfram-beginner-guide-overclocking.

I assume that you have a good aftermarket CPU cooler? If not, stop overclocking and buy one straight away.

When it comes to overclocking, the two settings you need to focus on are CPU multiplier and core voltage (VCORE), which usually increase in a consistent pattern. For example, here are the figures from my 2500k.

4.0Ghz -1.20V
4.2Ghz - 1.22V
4.4Ghz - 1.245V

LLC and offset voltage simply aren't worth the trouble in my opinion. You could spend hours testing for stability at different settings and the end result will be much the same.

Speedstep should be disabled as it automatically adjusts CPU voltage, which you don't want for overclocking. Turbo Boost should also be disabled as you don't want the clock speed to dynamically change when the voltage is set manually.

Overclocking is a manual task and anything that dynamically adjusts clock speed or voltage should be disabled.

Antman2000 · Jan 20, 2015

bicycle_repair_man :

My advice would be to stop what you're doing and have a read of this guide; http://www.tomshardware.co.uk/forum/272214-29-wolfram-beginner-guide-overclocking.

I assume that you have a good aftermarket CPU cooler? If not, stop overclocking and buy one straight away.

When it comes to overclocking, the two settings you need to focus on are CPU multiplier and core voltage (VCORE), which usually increase in a consistent pattern. For example, here are the figures from my 2500k.

4.0Ghz -1.20V
4.2Ghz - 1.22V
4.4Ghz - 1.245V

LLC and offset voltage simply aren't worth the trouble in my opinion. You could spend hours testing for stability at different settings and the end result will be much the same.

Speedstep should be disabled as it automatically adjusts CPU voltage, which you don't want for overclocking. Turbo Boost should also be disabled as you don't want the clock speed to dynamically change when the voltage is set manually.

Overclocking is a manual task and anything that dynamically adjusts clock speed or voltage should be disabled.

yea i got a good cooler on it ive never seen it go over 70 degrees, k i will read that. so ur theres no way i can have an overclock with low idle voltages? seems a bit lame.

bicycle_repair_man · Jan 20, 2015

You can have a low voltage when the processor is at idle, which is what offset voltage is.

Offset voltage is essentially the difference in voltage between when the processor is idle and when it's under load. Taking my 4.2Ghz overclock as an example, I know that I need 1.22V when the processor is at 100% load. Now let's say that when the processor is idle it needs 1.2V. So, what I would do is set the VCORE to 1.2V and the offset voltage to +0.02V. This will give sufficient power to the processor so that the PC can boot, along with extra power should the processor start running intensive tasks.

The problem with doing this is that you not only have to find a stable VCORE for when the processor is at 100% load, but another stable VCORE for when the processor is idle.

I use my PC for gaming, so I'm happy to forget about offset voltage and get all the performance. If your PC spends most of its time at idle, then offset voltage is a worthwhile pursuit.

Antman2000 · Jan 20, 2015

bicycle_repair_man :

You can have a low voltage when the processor is at idle, which is what offset voltage is.

Offset voltage is essentially the difference in voltage between when the processor is idle and when it's under load. Taking my 4.2Ghz overclock as an example, I know that I need 1.22V when the processor is at 100% load. Now let's say that when the processor is idle it needs 1.2V. So, what I would do is set the VCORE to 1.2V and the offset voltage to +0.02V. This will give sufficient power to the processor so that the PC can boot, along with extra power should the processor start running intensive tasks.

The problem with doing this is that you not only have to find a stable VCORE for when the processor is at 100% load, but another stable VCORE for when the processor is idle.

I use my PC for gaming, so I'm happy to forget about offset voltage and get all the performance. If your PC spends most of its time at idle, then offset voltage is a worthwhile pursuit.

i dont seem to have the option in bios to set the VCORE i just have modifiers

bicycle_repair_man · Jan 20, 2015

Your motherboard has an overclocking chipset so it should be there somewhere. If it's not called VCORE it could be CPU voltage or something similar.

Darkbreeze · Jan 20, 2015

I think you should read the information at the link I posted above, and this:

http://www.overclock.net/t/91/ultimate-overclocking-guide

If you want to save power etc., then just using the default turbo and c-state features is the best method and forget the overclock. Overclocking is for getting them most out of hardware by enthusiasts, NOT for people concerned with power savings. Performance and saving power are opposite ideas and do not live well in the same house. The higher average voltages used when overclocking along with the stress of higher clock values does not generally pair well with the constant "jolt" that occurs when the chip has to constantly jump from low voltage idle or low load situations to full load. Load line calibration and offset voltage settings can compensate somewhat for this, but it's just counter productive.

Also, there is no point in leaving turbo features enabled on an overclocked chip. Voltages will continue to have wild variations just as they will with speedstep enabled. Either overclock, or don't, but don't try to do both. That's what the default turbo boost features are for.

Antman2000 · Jan 20, 2015

Darkbreeze :

well im not too concerned about saving power i just want an effecient pc with an overclock, im playing around with the fixed voltage set it to 1.3 kept speedstep on ive ran burn test at 4.4ghz and prime 95 been going for for 20 mins or so, topping out at 63c and not crashed yet but its still running at 1.371v

im definatly clicking save and exit btw lol

Darkbreeze · Jan 20, 2015

As long as turbo boost and speedstep are enabled, the system will control both voltage and multiplier increases as it sees fit according to load. You might try going into control panel, power options, change profile settings, advanced power options, processor power management and set the minimum and maximum power settings to 100%. That should stabilize both the multiplier and the voltage. I say "should", because the BIOS settings may still override the windows configuration. It's a thought anyhow.

bicycle_repair_man · Jan 21, 2015

1.3V for a 4.4Ghz overclock seems abnormally high to me. Is that definitely the lowest stable voltage you can use? Also, are you using the Prime95 Small FFTs Torture Test? This is the only one that will push all the processor threads to 100% load.

Lastly, how about your cooler, which one do you have? 63C at 1.3V and 100% load sounds too good to be true.

Undying89 · Jan 21, 2015

bicycle_repair_man :

Its not high at all. Stop mumbling and scaring people, my stock voltages on 2500k are 1.28v. Sandy is safe up to 1.4v with decent cooling.

Mine is at 1.41v at 4.8Ghz stable last 3 years.

bicycle_repair_man · Jan 21, 2015

Undying89 :

Don't launch personal attacks, you'll just get yourself banned.

I'm not scaring the OP, I'm trying to help them achieve a stable overclock with a lower voltage. I'm well-versed with Sandy Bridge overclocking, seeing as I own a 2500k.

4Ryan6 · Jan 21, 2015

Antman2000 :

This was written using an ASRock motherboard and initially a 2500K, maybe it will help you reach your goal.

http://www.tomshardware.com/forum/id-2012433/sandy-bridge-series-multiplier-overclocking.html

This will help you attain 100% system stability.

http://www.tomshardware.com/forum/id-2345618/reaching-cpu-overclocking-stability.html

Good Overclocking Luck To You! Ryan

Antman2000 · Jan 21, 2015

i give up tbh im obviously not cut out for this complicated stuff im just using the preset 4.4 turbo in the bios, its stable and temps top out at 65c, im using a prolimatech megahalems with push pull btw, gonna save my pennies n get a h80i at sum point tho then maybe try out the 4.6 preset

Darkbreeze · Jan 21, 2015

Changing coolers isn't going to change anything related to your voltage fluctuating. Temperature isn't your issue, apparently, if your 65c readings are correct. Not sure what you're using to monitor temps but the BIOS, Core Temp and HWinfo, not HWmonitor, would be good choices.

Frustration is a common aspect of the learning process and if you can't be persistent, you won't have much success later any more than now. I'd say you had grasped the fundamentals a lot better than many novice tweakers do at first, so don't give in to frustration so early in the game. You also need to try to follow some instruction. When somebody says DO THIS, DO THAT. You can always change things back later after you understand better how it all works if you decide, eh, I really don't like this or that and would prefer to do this or that.

overclocking i5 2500k...im confused

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