Heatwave burning up CPU

wow!, summer really kicked in here in the UK... my max cpu temp jumped from 58 to 68C in only 2 days! anyone else out there in the UK have the same problem? I live down in Brighton.... i havnt had any cooling problems for a long time... its gonna be hard getting those temps down...

 

Yup,mines up 8 degrees!But my sunburnt head is up by about 50.lol

 

hehehe, i only got burnt on the arms yesterday

 

My cpu is still under 40c and I'm just north of london - boiling today!!!

 

I had no choice,I was building a six foot tall 50 foot long concrete panel and timber fence and we had to remove the old one aswell,8-5.30 no dinner,I drank about 6 litres of water and sweated it all out .

It ssuucckkeedd!!!The temp on the garden thermometer was 32 degrees c at 1 oclock and I live in the northwest god knows what its like down south .lol

 

Maybe you are looking for this

http://www.overclockersclub.com/reviews/coolermaster_hyper6_review.php

 

it is bloody hot here, but at least we get the seabreeze.. very refreshing at times..

A.Son, thanks for the suggestion, but the review of that HSF was very bad, "No matter what I tried, this heat sink was just plagued with issues", i was just wondering if others have the same problem.. im still within safe temps

 

If its a heatsink ya want olley thermalright make the best in the world,I will soon own my own xp-90c from overclockers,if anyone has seen them cheaper in the uk PLEASE let me know.

http://www.overclockers.co.uk/acatalog/Online_Catalogue_Thermalright_120.html

All of these rest in the top spots for thier catagories,if your on a budget though a basic in case wire tidy will help,get them all stealthed,take the grills off your fans,any chance of a picture of the inside?

 

thanks for the tip mate. ill post a pic later this afternoon.

 

what i have now it a Zalman CNPS7700-CU Ultra-Quiet CPU Cooler, much better than the stock cooler. but lately temps havnt been that great. cant belive i paid 45 pounds for it at Maplins, that was before i knew about overclockers.co.uk

 

My pc has gone up 10C i thought it was breaking didnt think about the weather. its boiling in yorkshire.

 

it 's not bad as you think if you use dual fan, one blow and the another pull out. but the most important is t* enviroment. You can not get t* CPU down under t* enviroment except dry ice and liquid nitrogen cooled or somethings like that...

 

right, here is my case from the inside, ive tried to remove the cable clutter as much as possible but with this case its not easy. i am also using a duct for the cpu and have a side fan blowing on the graphics card...

 

If you can get an 80mm fan on the top blowing in, that might help?

 

i was thinking about a blowhole... but i dont want to start cutting holes in my case and i wouldnt know how to.. but if i did it i would make it blow OUT the hot air...
how can i make a hole in there? i dont think a can opener would work..

 

i have one on my old box,what you do is draw a template around a cd where you want it,then drill a hole,then through the hole cut out the template with a jigsaw.I'm really experienced with a jigsaw though,so I could cut a hole pretty much perfect.But if you cant,you can always fit a bit of rubber around the outside to cover where the cut is wonky.

Then its a case of drilling 4 holes to screw your fan in.

 

I have noticed over the past few weeks my sys temp has gone up from 35c to 45c but my cpu has stayed stable at about 50c

 

here's the spec if anyone thinks its a bit high

Enermax CS-3051
Asus P4P800-E Delux
Jeantech JNP-500-AP PSU
P4 3.0GE (1meg yada yada) Using stock cooler as couldnt afford a better one at the time
1 gig ram
3 * Exahust 80MM fans all blowing out on top/side/rear of case im gonna change the side fan to intake to see if that drops the syst temp
1 * Intake 120MM fan in the front of the system case Blowing over HDD and in to case

 

Well so far so good ...... the system is stable at 41C now ...... cpu still at 50C but thats normal for my rig concidering my room is about 20c most of the time and thats not by choice

 

Oh.. it is not a good result, using AS5 for CPU and Chipset it will be better.

 

try using a cpu duct which will supply the fan with cold air from outside of the case. this can drop ur temps a little.. makes a difference of about 5-3C on mine...

 

Will get new CPU cooler and AS5 when i have the cash ............. as for the vent ....... my room was 20C last night at 3 am ..... today its about 27C (southfacing room, Boiler below the room, Hot water pipes under the room, and airing cupboard in the room too) ......... i contstantly have a 18" Pedistal fan moving the air around my room, but it just sucks cos of the heat .....

System is idle at 41-43C cpu is idle at 47c at the moment as i have the cpu fan running at 5111RMP (asus AIbooster setting on full Cou fan and auto System bus and Multi)

The CPU is a Pressy core (3.0GE) so as i understand from PPL here there run hotter than anything else on the Plannet lol

Just got the CPU fan down to 3515RPM as the auto CPU temp function started to work propperly ..... set at 50C for the Temp the system is trying to keep the CPU at (Qspeed adjusts the fan accordingly)


That sound about right people?

 

your cpu temps are ok, since u have a prescott (like me), but i think u can get ur system temps down by at least 5C. my system temp is at 37C max with this hot weather.. if u get ur system (case)temps down it should also reduce ur cpu temps a little

 

Will have a look at air flow and all that when i get back from work ..... at the moment its just that my room is so Fudging hot it takes the bisckit lol

someone buy me a portabale a/c unit and i will be happy

 

open your case using a big fan head airflow to your computer ha ha ...

 

Sounds like you guys could use some homebrew air conditioning !

 

lol! nice experiment. did u try it?

 

Nah, not yet...although I probably will this summer as it heats up!

 

This is a before and after shot of my pc from today and when I decided to tidy it up a bit

I just realised how much space i was taking up with the cableing etc ..... i could do a lot more work on it but cant be bothered to worry ....... that should help my temp drop a bit shouldnt it?

 

I must have done something right ...... just did a ut2004 test played at full graphics etc all the jazz on for 45 mins ...... and heres the results

Start (idle):

Board Temp 36C
CPU 47C

Load:

Board Temp 41C (max) 38.9C (avg)
CPU 56.5C (max) 53.9C (avg)

as i write this :

Board Temp 38C
CPU 45C

looks like the tidying up helped ....... also today is a LOT cooler in Enfield (North london) I didnt even here the cpu fan go in to overdrive once while Iwas playing

 

I found this configuration seems to suit my set up, I run AMD AthlonXP 2200 (1.8Ghz) i know thats slow by todays standards, my major heat comes from the power supply above the cpu, i 'think' the psu fan is drawing outside air in and blowing inside the case i know the top back fan kicks out the most heat where the lower and back side fans seem to be coolest, i have 2 normal fans in front of my hd drawing air in from the front and one side fan as in inlet too.when the fan controller alarm kicks in the fans boost up to full speed on the cpu and side fans and everything runs coolish even when my room temp is 27.5C. i have nick named this room the boiler room, its south facing too and it gets un bearable while downstairs its like a fridge lol, i was considdering taking the pc downstairs but all my audio rig is connected to the pc and its used mainly as a music machine with the SB Audigy2 ZS, and the occasional game of C&C-Generals thrown in with my ATI 9800 pro at full graphics settings runs just as cool, maybe a 3degree increase in cpu from 45 average to about 49-50C with graphics games running. is this all normal have i set my fans up right? can anyone help me improve on my set up?

 

There are some threads in cooling and modding, they maybe help.

 

Yeah -- if your ambient temp goes up, the temperature of whatever you're trying to cool with ambient air is going to go up by at least the same amount. You'll have noticed that heatsink specs show power dissipation capacity in terms of temperature rise above ambient, not absolute temps.

Cooling effectiveness is directly related to the temperature differential between the cooling medium and the object you're trying to cool. The lower that differential, the less heat you can remove from the object you want to cool. So you have two choices: reduce the temperature of the ambient air, or use another cooling medium whose temperature you can reduce below ambient.

Adding a fan or two works up to a point, because it reduces the temperature rise within the case. If you can reduce that temperature rise by 5C, you'll drop the temperature of your CPU by the same amount. But if the temperature rise between ambient and outflow from your HSF in your case is already as low as 5C, it will take a great deal more fan capacity to have any real impact on CPU temps.

If you check AMD's white paper on the topic, you'll find that they allow for a temperature rise of 7C or less in the air passing through your HSF. If the rise is greater than that, you need to do some work on the airflow within your case.

My room (ambient) temperature is normally about 23C; under those conditions, my CPU will be running at about 42C. Case exhaust temp is about 28C. When things get hot outside, my room temp will sometimes reach or exceed 30C. Temperature rise within the case won't exceed 6C. Under those conditions, my CPU temps can reach or exceed 55C. Interestingly, the differential between ambient and CPU temp is not quite constant within that range -- that differential increases slightly with rising ambient temperature. Can anyone explain why?

 

Yup,the amount of air a fan can move is measured in cfm"cubic feet per minute"as you probably know,If we take a cpu fan with say "easy values
"50cfm and a room temp of 10*.Its the cool air that takes the energy"heat" away from the heatsink,lets say the heatsink is giving off 20* of heat constantly all the way through that minute the fan is blowing air through it.

Now we have to take an imaginary chunk of our 50cfm of air,say 10cfm for every 10cfm of air that passes over the heatsink at 20 degrees is is able to take away with it 1* of heat energy,in that total minute altogether it lowers the temp of the heatsink by 5 degrees and the heatsink temp levels off at 15 degrees.

Now if we raise the room temp to 10.5 degrees,each chunk of 10cfm is half a degree hotter therefore thats half a degree more heat we cannot remove in every chunk 0.5 x 5=2.5 degree increase in heat stuck in the heatsink leaving it at 17.5 degrees a 5 fold payoff for only a half degree increase in case temp.

If we can throw more chunks of air past the heatsink 60cfm,thats an extra 10cfm or 0.5 of a degree per minute,lowering our temp to 17 degrees but,if we can lower out case temp by half a degree with that extra airflow we can get the heatsink temp back down to 15 degrees,because each chunk of air can take an extra 0.5* with it 5x0.5=2.5 17.5-2.5=15degrees!

all these value's and numbers are B#!!$!{{ -they are no where near real world figures its just to give an idea,how the air inside the case is much more important than the speed of the cpu fan.

 

It's incredibly hot in midlands today, just heard that the tarmac at Birmingham airport has melted, and its hitting my PC too...

As i write this, on my P4 3.4ghz, System Temp is 51C and CPU 66C, when running a prog like Everquest 2, system temp goes to 55C, and CPU 80C.

Tbh i smell a sensor problem, when i first built this machine some months back, it was reading 90-100C idle in bios. Now is it just me, or is it supposed to either: a) melt or b) shutdown anywhere NEAR that temperature, i.e.70C. The air coming out of my case is cool, i have never suffered performance problems, even back when it gave stupid readings. I have a 80mm front fan pulling air in, aswell as one i added to the side vent also blowing air in( running at 3500 rpm) and a 120mm at the back blowing out. My CPU fan runs at constant 3500rpm also and was fitted about a month back with new compound and would then only goto 55-65 under load, and system being around 35-40.

To me, it's either the compound has let me down again or the sensors are wrong...anyone got an opinion? Although my system is smooth, it could be getting damaged. Ive also updated my bios.

Could the heatwave really be doing this much?

 

The general consensus seems to be that the temperature sensors in most systems aren't particularly reliable. But it's rare for them to change their response to a given temperature.

But it could be the heat wave. It's hard to tell without knowing more about how severe that heatwave is and what impact it has had on the room (ambient) temperature in which your computer is operating. You haven't provided that information.

But if you do the arithmetic, you'll see that my post of 07-13-05, 19:24 tells you that a 7C rise in ambient temperature translates to a 13C rise in my CPU temp.

You've indicated a CPU temp that's 15C above the maximum you normally see. I don't know that my experience of ambient temperature changes is typical -- but if it is, the CPU temps you're seeing could easily be the result of your heat wave.

I wouldn't worry too much. P4's throttle themselves back to prevent excessive internal temperatures. Have a look at the page at <http://www.heatsink-guide.com/content.php?content=maxtemp.shtml> when you have a moment.

Oh, yes -- speaking of sufficiency of information: fan RPMs look nice, but they don't actually say much. You'll have seen earlier in this thread that what counts is how much air is moved through the CPU's heatsink. Fan RPM doesn't translate well to air volume -- the latter depends on too many variables, like: fan size, blade shape and efficiency, airflow restrictions, etc. Another major factor is whether the fan was optimized for quiet running or maximum air volume. Take your pick -- you can't have both in the same fan.

 

Thanks for reply

Ive just booted my machine up for first time today and system temp is 45C and CPU temp 60C.

Seems you are most probably right on the heatwave thing as both seemed to have risen in temperature evenly by about 10C. I did a test last night and played a game for an extended periods. The temperature of the CPU hit 83C and the system hit 57C.

I experienced no performance problems in the slightest, and throttlewatch reported 0 throttling at any time. If i remember rightly, it used to throttle a while back when it would 'read' temperatures of above 90C, so maybe its triggered at the max temp of 90C (which is stupid).

Hard to say the room temp, but outside its around 27C, rising to around 30C most days. I have a room fan in here, but u can feel the humidity.

I think ill accept that as the system temperature affects the CPU temp, that this is the problem. I have smart cabling inside my coolermaster case, which i downsized from a larger midi case a month or two back, which intially showed stable temps.

I guess ill pay less attention to the readings until i suffer problems, cos atm theres literally nothing it seems that can be done about it bar getting AC in my room

 

I have a P4 3.0 with the Presscot core which is known to run hot even in the best of conditions, I don't think mine ever gets below 60C even in the winter with the heating off ! Had the same problem before on another build using the same spec so this time I installed a Zalman cooler which is very good but the other day I had the alarm go off when the system was loaded and it reached 86C. Checked it with another sensor that I have installed and that also confirmed 86C. I did not notice any throttling and apart from the irritating alarm (until I turned it off) everything seemed to be working fine. Once the offending programme had finished the temp returned to its normal 68/69C. Interestingly enough the MB temp always stays at around 37C.
The alarm is triggered at 80C and this has gone off a few times (when doing a full virus scan before a back up causes it) over the last 6 weeks or so.
Anyone beat 86C ?
Regards
FBW

 

You obviously have removed the heatsink but is it very snug, not wriggling??? If it is a bit loose then air can get in and cause "significant" temp increases but don't over tighten and break something.

Is this a "Prescott" if so they came out of the box hot!!!!! and from overclockers.net 55-65C is the standard operating temps of a Prescott which is what mine used to be at. When you say you have a hot day what ambient temps are you refering to?

The other day my local PC shop had a sale on and I bought some "rounded" cables and a couple of fans. Tided all the cables up and modded my box a bit to develop a flow path along the lines off a "straight through system" like a BTX box and I actually was achieveing 38C (from avg 0f 42-43) the other morning, thats 4-5C . I only have the 1 DVD drive and mounted the Orange fan there, have a look. I removed some empty front panels to increase inflow potential and can defiantely feel at least 10-15% increase in outflow from the exhaust. So now essentially the Front Inlet flows directly to the CPU Fan which also has a funnelled side inlet blowing onto it and straight to the rear exhaust. I have another side fan directing towards the Video Card which has a chipset fan as well.

From the pics we can see I tidied a lot of wiring up by placing it within "voids" on the left hand side.

Consider a straight through flow path if you can and you may find it will amke a signifcant difference.

 

cabling really mucks up airflow...next system i build will have a modular power supply, and all sata drives...right now i have two ide drives, using two round cables that are much shorter then the ones i had previously and have only one connector at each end instead of having two for CS or master/slave...when i swapped out the cables my cpu went down 1C and my graphics card went down 5C (crappy cooler on the 7900 gt i bought...)

 

My cheap watercooled PC went up to 56C - the rest are still working fine.