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why i7 frequency changing in load?

B

bkzed

Member
I managed to overclock my new system to 4.15 ghz, I run prime95 whole night and it is stable.

but when I watch frequency in CUP-Z it changes from 4150 to 1650 in a minute for few seconds and then goes back to 4150.... and it happens all the time while prime95 is running. I tried running test in smallFFT and In Place large FFT's but it happens in both of modes. now when idle the frequency always stays at 4150 mhz?

EIST, C1e, CState, turbo boost all options are disabled.

--------------------------------------
i7 870@ 4.15Ghz 1.376v(cpuz) Rest on Auto
Asus-P7P55D-ELX, XMS3 4GB@ 1500(9-9-9-24)1.65v,500WD,SilentPro 600w,H70(push/pull),Eite-334,QuadroFX 3800 1GB,Win 7 64bit
 
Probably just an issue with CPU-z if speedstep is indeed off. I would use a different monitoring program to get a second opinion.
 
i tried with core temp realtemp and cpuz, all of them are changing the freq. then in bios i double checked everything all power saving opt are disabled. also disabled power saving scheme in windows. but no sucsess...should i re install windows?
 
I have speedstep off but C1E enabled. My CPU throttles down from 4GHz to 3GHz when there is no action. It comes back at 4GHz as soon as I move the mouse 🙂
 
^ What monitoring program are you using? Tmonitor gives the best real-time display of multiplier/clock-speed.
 
betasub said:
^ What monitoring program are you using? Tmonitor gives the best real-time display of multiplier/clock-speed.
Click to expand...
As a minor aside, this is the first time I've seen this program. Thank you for pointing it out; I've always wanted something like this.🙂
 
What temperatures and cooling do you have? I wonder if this lower multiplier when under load is caused by thermal throttling?
 
bkzed said:
I managed to overclock my new system to 4.15 ghz, I run prime95 whole night and it is stable.

but when I watch frequency in CUP-Z it changes from 4150 to 1650 in a minute for few seconds and then goes back to 4150.... and it happens all the time while prime95 is running. I tried running test in smallFFT and In Place large FFT's but it happens in both of modes. now when idle the frequency always stays at 4150 mhz?

EIST, C1e, CState, turbo boost all options are disabled.

--------------------------------------
i7 870@ 4.15Ghz 1.376v(cpuz) Rest on Auto
Asus-P7P55D-ELX, XMS3 4GB@ 1500(9-9-9-24)1.65v,500WD,SilentPro 600w,H70(push/pull),Eite-334,QuadroFX 3800 1GB,Win 7 64bit
Click to expand...

Are you sure this is not happening while P95 is switching through each loop? Every time you complete a line you switch to the next process, which may momentarily drop your clock speed.
 
betasub said:
What temperatures and cooling do you have? I wonder if this lower multiplier when under load is caused by thermal throttling?
Click to expand...

Its happening with any program that uses 100% cpu load.

Yes I think you are right thermal throtteling is limiting me.
In my bios there is option called CPU TM FUNCTION, if I disable it lower multiplier problem is gone. but now....

my temps at full load prime95 are houring around 77 degrees max, and as soon as it hit 75c the throteling was suppose to come in to play, but now it is disabled what happens is when it hits 76c the computer shutdown itself, I wonder why? I have very good cooling solution Corsair H70. and ambient temps are within 22c, whats wrong....? below are my current cpu specs

i7 870@ 4.0ghz 200*20 1.365v in bios and 1.336 in cpuz full load.
imc = 1.34v,
rest is on auto, see my signature.
 
Last edited:
Have you tried returning to stock speed and voltage? This will keep temperatures down while you test. If temps are still high under load, you may need to re-seat the heatsink on the CPU, or improve the cooling on the H70 radiator.
 
bkzed said:
Its happening with any program that uses 100% cpu load.

Yes I think you are right thermal throtteling is limiting me.
In my bios there is option called CPU TM FUNCTION, if I disable it lower multiplier problem is gone. but now....

my temps at full load prime95 are houring around 77 degrees max, and as soon as it hit 75c the throteling was suppose to come in to play, but now it is disabled what happens is when it hits 76c the computer shutdown itself, I wonder why? I have very good cooling solution Corsair H70. and ambient temps are within 22c, whats wrong....? below are my current cpu specs

i7 870@ 4.0ghz 200*20 1.365v in bios and 1.336 in cpuz full load.
imc = 1.34v,
rest is on auto, see my signature.
Click to expand...

Your problem is you're trying to melt your processor. 1) Intel lists the maximum CPU temp to 72C. 2) Don't turn off TM, it's trying to stop you from melting said processor.
 
bkzed said:
Its happening with any program that uses 100% cpu load.

Yes I think you are right thermal throtteling is limiting me.
In my bios there is option called CPU TM FUNCTION, if I disable it lower multiplier problem is gone. but now....

my temps at full load prime95 are houring around 77 degrees max, and as soon as it hit 75c the throteling was suppose to come in to play, but now it is disabled what happens is when it hits 76c the computer shutdown itself, I wonder why? I have very good cooling solution Corsair H70. and ambient temps are within 22c, whats wrong....? below are my current cpu specs

i7 870@ 4.0ghz 200*20 1.365v in bios and 1.336 in cpuz full load.
imc = 1.34v,
rest is on auto, see my signature.
Click to expand...

There is a safety meant to prevent you from ruining your CPU that just shuts down power when it gets too hot (cannot be disabled)... to prevent sudden power loss there is a second safety called TM which throttles your speed when you get close to the temp at which it would shut down.
First, re-enable TM. Then lower your OC or improve your cooling solution.

While we are at it... read this before you do any more over-clocking: http://forums.anandtech.com/showthread.php?t=230509
 
Last edited:
bkzed said:
Its happening with any program that uses 100% cpu load.

Yes I think you are right thermal throtteling is limiting me.
In my bios there is option called CPU TM FUNCTION, if I disable it lower multiplier problem is gone. but now....

my temps at full load prime95 are houring around 77 degrees max, and as soon as it hit 75c the throteling was suppose to come in to play, but now it is disabled what happens is when it hits 76c the computer shutdown itself, I wonder why? I have very good cooling solution Corsair H70. and ambient temps are within 22c, whats wrong....? below are my current cpu specs
Click to expand...

I have Apogee xt,D4 pump and a Swiftech MCR-320 radiator.
To me and to many overclockers this is a FAIR not GOOD cooling system.
Now because you have no hs fan your mosfets heat goes to you cpu.
Need to run a lower speed or get better cooling.
Now way would run prime at 80c.
I would run short benchmarks like Cinebench for a 60 seconds
I got few scores of 7.5 on Cinebench before pc shut off do to heat etc
 
It sounds like throttling to me...

Confirmed by your later posts. I would run a program that monitors for throttling... that should give you a better indication than watching for blips.

It's really bad news if the chip is turning off to protect itself! Turn TM back on and reassess your cooling!

IGemini said:
Your problem is you're trying to melt your processor. 1) Intel lists the maximum CPU temp to 72C. 2) Don't turn off TM, it's trying to stop you from melting said processor.
Click to expand...

That is Tcase, not Tjunction... the programs should be reporting the distance to Tjunction.

Although 76 degrees does sound high for watercooling... take the heatsink off and clean it and reapply some good Thermal Interface Material (TIM), then check the temps again...
 
Yes I turned ON that TM option again I dont want to burn my chip, I dont have problem if it throttles itself but my only concern is after lowering down frequency to 3.9ghz it still starts throtteling after 70c.... I think It should cross and reach atlest 85-90c before it starts throttling. the ambient temps are also very low here only 15c...

I do have another system with same i7 870 @ 3.65ghz on MSI H55M mobo with cheap hyper 212+ cooler I hardly hit 63c on prime95

I doubt my chip is having sensor issues or something seriously wrong....

I think I have a good perfomance H70 cooler and I am expecting atleast 4.1ghz overclock from it.
I will try to swap my cpu's and apply high performance TIM then see how it performs.
 
Last edited:
Yes I turned ON that TM option again I dont want to burn my chip, I dont have problem if it throttles itself but my only concern is after lowering down frequency to 3.9ghz it still starts throtteling after 70c.... I think It should cross and reach atlest 85-90c before it starts throttling. the ambient temps are also very low here only 15c...
Click to expand...
The problem is that it is still reaching that temp... since throttling is based on temperatures, it will always throttle at that temp.
you need a better cooling solution to reach that kind of overclock.
 
taltamir said:
The problem is that it is still reaching that temp... since throttling is based on temperatures, it will always throttle at that temp.
you need a better cooling solution to reach that kind of overclock.
Click to expand...

Its not tempreture trust me, I replaced the H70 with stock HSF and intentionally did little overclocking to see how it performs in high temps.....and I surprise to see temps are within 90-95c without any thermal throtteling on linx?????

I also put that i7 870 to other motherboard and checked with moderate OC on hyper 212+ and CPU has no problem crossing 85-90c temps without thermal throtteling.....

This is really bad...
OC 3.65ghz on hyper 212+ I get 63c max temps on linx 5 runs , and on H70 I get 70c max temps with linx 5 runs.....

H70 is 3 times expensive than hyper 212+..............is my mobo is having something wrong that is leading me to thermal throtteling with only H70??

Please help me I am tired and cant think what to do..
 
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