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P4 3.2Ghz running at 3.8GHz Prime95 stable, but I have a question

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Wizzard005

Member
Joined
Sep 9, 2005
Location
Kauai, Kapaa, HI
P4 LGA 775 3.2Ghz @ 3.8GHz Prime95 Stable; Temps are bad, pics / videos

Hey all,

I have my system over clocked with a aftermarket CPU heatsink / fan. My question is what are safe temps for the LGA 775?

Normal load its 51c , under full load its 68c - 71c

The fan is thermal controled and only kicked up a small bit when running under full load.

Here is a picture:

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I ran Prime95 for 4 hours with no errors, so i am guessing everything should be ok.

UPDATE: I put it back to stock (no overclock) And the Temps are the same as if I overclocked it. This doesnt make sense to me as there is a noticable preformance difference from 3.2Ghz to 3.8ghz

Here is a picture of no overclocking

Untitled-2.jpg
 
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That's too high, imo. Download Throttlewatch and see if it is throttling. I'm betting it is at those load temps. I wouldn't want to venture far past 60c.
 
Hum,

Thats what I though, however I havent had any problems at all. The computer has been very stable and on idle sometimes it will read 3.3 / 3.8.

prime95.gif


It will run Prime95 for hours with no errors.

Stock cooler it ran around 50 - 52 , this is only a little higher and like I said before I have had no problems.
 
I was watching CPUz and this is what it does. It flips from 3.3Ghz to 3.8Ghz when it idle's and when you turn in prime95 or any other app it runs at 3.8Ghz.

Like I said above, I ran Prime95 (two of them) for 3 1/2 hours with no problems.

The CPU Fan runs from 1200RPM - 4000RPM. At 68 - 70c its only running at 1900RPM.

OLD Setup:
DSC00314.JPG


New and Current Setup:
DSC00332.JPG



Anyone have the real Operation temps for the LGA 775. 70 Must be safe as stock it runs at 51c (stock cooler)
 
Know Nuttin said:
That's too high, imo. Download Throttlewatch and see if it is throttling. I'm betting it is at those load temps. I wouldn't want to venture far past 60c.


Here is that Program, and this is what I found:

CPU.jpg



Any clues why its doing this? Wouldnt it be the other way around, under load it would throttle down?

Why would it run slower at idle and faster under load? Its like the speedstep on a P4m :)
 
It is indeed like speedstep. Is your CPU a 640 by any chance? If so, when it's "idle", it will drop the multi down to 14x. BTW, you might wannah prime it for 24 hours. 4 hours isn't nearly long enough and you want a minimum or 8. I've had chips report errors 6 hours into the testing so 4 isn't really too telling.
 
ghost_recon88 said:
It is indeed like speedstep. Is your CPU a 640 by any chance? If so, when it's "idle", it will drop the multi down to 14x. BTW, you might wannah prime it for 24 hours. 4 hours isn't nearly long enough and you want a minimum or 8. I've had chips report errors 6 hours into the testing so 4 isn't really too telling.


I have the 540 1MB :(. I will be upgrading to the new chip when it comes out......

I guess it is in deed stepping down like you said, the temps just scar me a bit :p
 
The throttling you see is because of the heat when it is at load. You need to get better cooling. Ideally, you don't want any thermal throttling to occur.

Stability at Prime95 doesn't mean too much if it is throttling. You need to ensure that it does not throttle first, then deal with Prime95 afterwards.
 
I called intel today and I asked them what the safe temps are for the CPU. They told me anywhere from 50 - 80c there shouldnt be a problem.

I have a very good aftermarket cooler (coolermaster Hyper 95)

I also ran Prime95 while I went to bed from the last post I did about 10 hours ago and nothing error'd out and it stayed around 68 - 69c the whole time.
 
There isn't a problem, per se, but throttling is not what you want to have happen. It's basically a safety measure built-in, to prevent the CPU from cooking itself. It's not a great feature to use or rely on.
 
I'd say those temps are way high with a good HSF. My 478 3.2E runs at 4.01GHz, and never gets above 53*C with an XP-120 and 120mm fan on low speed. I also just built a LGA775 / 630 system with the stock Intel HSF, and it also barely touches 53*C at 3.30GHz (light overclock on stock HSF).

Something is amiss with your cooling IMO. Do you have a "Fresh Air Tunnel" and descent case temps? What is your Vcore? How did you apply your Thermal Compond?

Your throtling appears to be "Backwards" - almost like what some Laptop CPU's do to conserve power (lower the CPU's multi when not used to save power, and raise the multi when the CPU is really needed). You got me...

Good luck :cool:
 
Hi, and ahppy new years! Ok, you can't compare the 478 chip heat with the LGA 775. the LGA 775 run hot, hot! No intel HSF will de any good esp. When OC'ng. My personal experience has been this:

I had a 530j 3.0GHz cpu that was almost as hot even with arctice silver and the stock HSF. I made an investment of a new alumminuim case and switched from 80mm to 120's. Thsi was a great help, yet the real problem lies in the heatsink and thurmal option you are using. I installed the Thermalright XP120, and used arctic silver 5, I also used arctic cleaner and remover first so I had a clean install.

So without and OC I went from 50c idle 66 / 68c load to an exellent 35-38c idle 50c load. OC's it to 3.6GHz no problem! I have since then installed a 660 3.6 LGA 775 with 2mb cash. Same deal! You can OC it to 4.3 GHz and still be under 61c Idle 38c OC'd!

I would highly recomend this HS and Thermal option. Plus if you do not want to spend more on a case, make sure you do some wire/cable management to get better airflow. You can invest in a Water cooling option but personally I know I would risk getting water all over the inside of my system :) Scares me!

Hope this helps!
 
The second system I sighted was indeed a LGA775 / 630 system WITH the stock Intel HSF (stock Intel HSF fan at 30% in "Smart-Fan", 80mm side intake @ 7v, and 92mm exhaust @ 7v - VERY quiet system, too). Runs at 3.3GHz and no higher than 53*C after a long night of Sandra. I removed the crappy Intel "Thermal Pad", and used good old AS-5.

The scary thing is the Notrthbridge runs almost as hot at times (idles 38*C - load 51*C or so) :eek: A NB HSF might be a good idea, huh? ;)

And yes indeed: Happy New Year! :cool:
 
Oh Yah!

OH YAH! It just hit me! Get the AIbooster off your start up. DON"T USE IT. Use the AI OC in your bios instead and keep track of your heat and fan speed etch thought Probe II. AI Booster can reak havock trying to change bios setting within windows. I think you will find the less running at start up and in your sys proccesses the less heat you will have cause your CPU is not working as hard!
 
Thanks guys and happy new year! I am going to re-put the thermal guw on the CPU and see if maybe I didnt use enough or I used too much.

I Have a 200.00 case with very good cooling:

DSC00302.JPG


The only thing I can guess is maybe the Heatsink I am useing isnt all the way on the cpu, meaning this not as tight as it can be, however, if you look here:

DSC00319.JPG


Not sure if I am tighten it up more :)

Well , here goes, taking the PC apart, if the temps are the same, I am going to install the Stock CPU fan and see how it runs.
 
Im thinking by the throttlewatch graff you are only running one app of prime95 as you only have 50% load, also throttlewatch should have a red graff showing the throttle amount.\

My 640 throttles at 60C over 4G.
 
Well I took the heatsink off and put more stuff on it to see if it helped. It didnt, same thing, 70c under load.

Some of asked about my case, here is a picture of the Setup:

DSC00344.JPG


DSC00345.JPG


DSC00346.JPG


DSC00350.JPG


DSC00352.JPG



I also took a video of the strange think my CPU is doing during idle, let me know what you all think.

I think i am going to go to the store today and get the XP-120

here is the video: http://www.toy4runner.com/video/Heat.wmv

It should stream from the server, if it doesnt, please let me know.
 
Wizzard005 said:
The fan is thermal controled and only kicked up a small bit when running under full load.

I think this might be the key. Is there any way to by-pass the thermal control on the fan and make it run full speed? I have one of those "smart" fans with a built-in thermister and found it is not a good idea for a CPU fan when you have good case ventilation (like a intake fan blowing right on it like yours does). What happens is the fan thermister never gets warm enough to run the RPM at a faster speed. Try another fan.
 
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