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Very interesting problem while OC'ing a Asrock z68 extreme7/ i7 2600k

post #1 of 29
Thread Starter 
Hi fellow OC'ers,

I really need your help on this.

I am trying to overclock my i7 2600k with my Asrock z68 extreme 7.

The problem is, my multiplier keep dropping from x44 or x46(depending on what i set) to x38 while running prime 98.

i WC my system and I notice it drops to x38 the minute HWmonitor jumps to 55degrees. However, the funny thing is, if i use the mobo's default turbo OC 4.4 setting, it stays at x44 even if the temperature goes up to 61 degrees.

long story short, i did 2 extreme scenarios to demostrate this.

1st, i disable all thermal options in my z68 UEFI settings.
set my OC to 4.4, the below pictures show vcore as auto, but rest assure. i got the same result ranging fixed vcore at 1.265 to 1.45v. I have also tried CLL with level 1 and 2. All the same effect.

Images below:

img0183vl.jpg
By aiers at 2011-12-13

img0184v.jpg
By aiers at 2011-12-13

img0185x.jpg
By aiers at 2011-12-13

img0186nq.jpg
By aiers at 2011-12-13

RESULTS:
when i first run my CPUZ it shows x44 before i run prime95

pic01z.png
By aiers at 2011-12-13

when i just run my prime 95, so far so good.

pic02m.png
By aiers at 2011-12-13

Less than 2mins later. Presto! dropped to x38? and funny thing is, after i run for a long time, it stays x38!

pic03m.png
By aiers at 2011-12-13

2nd scenario, i use the default mobo Turbo OC 4.4, with all the settings enabled.

img0187kd.jpg
By aiers at 2011-12-13

After 5 mins of prime 95, stays x44 but the funny thing is, the temp is already higher than my 1st scenario.

pic04.png
By aiers at 2011-12-13

I am stumped. sorry i am not very pro in oc'ing, but this is really making me confused. The only thing i can think of is my mobo is spoilt.

I dont mind BSOD or such to tweak the fixed voltage and etc... but the thing is, this multiplier just change by itself even though i disabled everything.

Windows 7 set to high performance under the CPU portion.

any experts please help?
Edited by aiers - 12/13/11 at 7:47am

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post #2 of 29
that does sound strange, the main reason i could think of that would cause this is as you said thermal protection features, but at 55*C they shouldnt be kicking in. its possible that a bios flash to the newest version might fix this problem.
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post #3 of 29
I had a similar issue with my Extreme4 Gen3, where my CPU would drop to 4.1 GHz under heavy load. I followed this back to the Turbo Boost power limit setting.

According to this video, you actually want to have SpeedStep enabled, which allows the Turbo Boost power limit to be increased. The video also provides some other starter settings for starting out overclocking on these Asrock SB boards.

Did you check the voltages when running the optimized 4.4 GHz OC? I wouldn't be surprised if those auto modes messed with voltages.

Good luck!
post #4 of 29
The reason why it drops multi's is because theres not enough Current to the cores. This has nothing to do with vcore.
You need to raise the turbo power from 113 and 95. 
Change the 113 to 170 and the 95 to 150.

Enable speedstep to get access to these values. Then u can disable after if u wish but make sure u change those two fields.
Leave core current limit at 150. And i would leave thermal throttling on man, this is a good feature to have and wont mess with your overclock.

You dont have to have speedstep enabled, as long as u make those changes, it will remember them even if u disable speedstep after.
Edited by Denim-187 - 12/13/11 at 6:57am
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post #5 of 29
Thread Starter 
Quote:
Originally Posted by himynamesjim View Post

I had a similar issue with my Extreme4 Gen3, where my CPU would drop to 4.1 GHz under heavy load. I followed this back to the Turbo Boost power limit setting.
According to this video, you actually want to have SpeedStep enabled, which allows the Turbo Boost power limit to be increased. The video also provides some other starter settings for starting out overclocking on these Asrock SB boards.
Did you check the voltages when running the optimized 4.4 GHz OC? I wouldn't be surprised if those auto modes messed with voltages.
Good luck!
Quote:
Originally Posted by denim-187 View Post

The reason why it drops multi's is because theres not enough Current to the cores. This has nothing to do with vcore.
You need to raise the turbo power from 113 and 95.
Change the 113 to 170 and the 95 to 150.

Enable speedstep to get access to these values. Then u can disable after if u wish but make sure u change those two fields.
Leave core current limit at 150. And i would leave thermal throttling on man, this is a good feature to have and wont mess with your overclock.

You dont have to have speedstep enabled, as long as u make those changes, it will remember them even if u disable speedstep after.


Thanks for all the sound advice.

This "The reason why it drops multi's is because these not enough Current to the cores. This has nothing to do with vcore." is what i think is the problem indeed.

I thought about it earlier but i was thinking along the lines of the VTT too low because i dont know enough about this turbo power thingy.

Can anyone explain abit about this turbo power? what does it got to do with downgrading my multipliers? i though if i do the settings wrongly, i will just get BSODs, so the mobo is actually smart enough to reduce the multiplier when it detects that there isnt enough current to flow to the cores under load?

and they say that oc'ing on SB is made easy!
post #6 of 29
Thread Starter 
oh ya, something funny.

so since i can run at 4.4ghz using the turbo oc optimized settings. i run it with a offset vcore voltage of 0.030. now im running 4.4ghz on 1.24 biggrin.gif

another walkaround? nah. i am testing what denim suggested right now.
post #7 of 29
Quote:
Can anyone explain abit about this turbo power? what does it got to do with downgrading my multipliers? i though if i do the settings wrongly, i will just get BSODs, so the mobo is actually smart enough to reduce the multiplier when it detects that there isnt enough current to flow to the cores under load?

and they say that oc'ing on SB is made easy!

Its the max turbo power supplied to the chip, now since 2600ks run 3.8ghz turbo stock, thats what the max turbo power is set to.
Thats why you throttle to 3.8ghz. Yes the board is smart enough to know how much is being fed for turbo, less power, less turbo multi.
Do u understand how to change the limit in the bios ? Or are u unsure?
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post #8 of 29
Thread Starter 
Quote:
Originally Posted by Denim-187 View Post

Quote:
Can anyone explain abit about this turbo power? what does it got to do with downgrading my multipliers? i though if i do the settings wrongly, i will just get BSODs, so the mobo is actually smart enough to reduce the multiplier when it detects that there isnt enough current to flow to the cores under load?
and they say that oc'ing on SB is made easy!
Its the max turbo power supplied to the chip, now since 2600ks run 3.8ghz turbo stock, thats what the max turbo power is set to.
Thats why you throttle to 3.8ghz. Yes the board is smart enough to know how much is being fed for turbo, less power, less turbo multi.
Do u understand how to change the limit in the bios ? Or are u unsure?

roughly from your advice.

now i am getting BSODs as per normal without enuff vtt. lol

i am trying

46ghz

Turbo bost setting
Short duration 170
Long duration 150
maintain 1 sec
additional turbo voltage auto.
core current limit 150
vtt 1.3 (just failed)
CLL level 2

rest of the setting auto. speedstep on.

trying 1.35 vtt now.
should i be changing turbo boost watt?

more information
although i put 1.3, my cpuz display my vcore at 1.26. seems like it flunctuates abit?
Edited by aiers - 12/13/11 at 7:17am
post #9 of 29
Thread Starter 
Latest update.

4.6ghz
1.35 vtt
Turbo bost setting
Short duration 170
Long duration 150
maintain 1 sec
additional turbo voltage auto.
core current limit 150
CLL level 2

rest of the setting auto. speedstep on. thermal on. c1e on.

just pass the prime 95 initial test for the 1st few minutes.

CPUZ shows 1.30-1.33 vcore although i set vtt at 1.35. Do you think its any concern here?

and the auto multiplier drop is gone!

i run xspc raystorm wb, initial temps at 61degrees.. i dont think it will raise much.

I will run this prime95 through out the night to test stability. if temperature is around 65 should be ok right?

Thanks for you help Denim/jim. +rep for your help!
post #10 of 29
Vtt? Do u mean vcore? Cause vtt is different and should be left on auto in your case.

Level 2 LLC is where its at, good choice. Keep it on lecel 2 and try find you minimum stable voltage.
Edited by Denim-187 - 12/13/11 at 7:36am
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