HELP!!!: My mobo temp is higher than CPU temp!!in Asus p5k Mobo

[Alexk400]

I always used to see cpu temperature high than mobo temperature.

In this case of p5k it is reversed. I removed and reinstalled my e4300 few times to see whether it is my install problem.

With side cover open

cpu - 22C
mobo - 39C

With side cover closed.

cpu - 28C
mobo 47C

Can some advise me it is ok or do i need case fans to cool it down?.

The issue though i don't see my mobo is hot by touching the case. so it is measuring the mobo temp somewhere.

Let me know.

Thanks
alexk

 

[SerpentRoyal]

The readings may not be accurate, but the delta T tells you that you need to provide better air flow across the case.

 

[Noubourne]

The fact that the chipset is hotter than the CPU is not an issue. Also, I believe Intel's specs for that chip set the Tc Max at 100C, so 47C is not an issue either. Not even close.

Of course, that's not load I take it. Idle temps mean jack. Run some stress tests w/ the cover on and see what happens. I wouldn't get worried about it unless my chipset hit 80C. Of course, I wouldn't be happy with that, but you are nowhere near failure at 80C even.

8C difference side off vs. side on isn't GREAT, but it's no reason to panic. That might rise at load temps though. I still highly doubt there's any reason to worry about this.

 

[Cutthroat]

Completely normal and by design. Asus calls it StackCool, my last 3 Asus boards were all like that.

From the horses mouth:
"Stack Cool 2 is a fan-less and zero-noise cooling solution. It effectively transfers heat generated by the critical components to the other side of the specially designed PCB (printed circuit board) for effective heat dissipation. Stack Cool 2 is able to decrease component temperature by as much as 20?!"

I really don't know if it works or not. My CPU's seems to run cooler than on some other boards, but the motherboard always seems to hot for my liking. I've never actually seen any reviews on this particular feature.

 

[Alexk400]

After i closed my case for few hrs. mobo temp went to 55C and my CPU went to 42C

So if i keep it like that it will fail sooner or later. Even my old prescott pc was n't this hot for idle browsing condition. I want to keep cooler. That means i have to put 3 case fans. Let me go get some case fans and test this again.

Until then keep finger crossed. vanilla P5k do not have stack cool feature.

But i see why MOBO is hotter as the heat from CPU is spread across mobo using heat pipe. I think.

 

[Cutthroat]

I wasn't aware that the vanilla P5K didn't have that feature, I actually thought all modern Asus boards had it.

Although I don't think you will fail eventually at those temps, I wouldn't like them either, a bit too high. Do you not have any case fans now? That would certainly explain it, you really need case fans to provide airflow through the case, however you can run modern CPU's with large modern heat sinks and not use a CPU fan.

Cleaning up your wiring and strategic placement of your HDD's & PCI cards. Try to make sure your Video card is not exhausting directly onto your northbridge.

What kind of case are you using, if it's a P180 I can give you a few specific tips.

 

[Alexk400]

Don't have money to buy p180. I bought used ATX case for 15 bucks. What is best heat sink /fan for cpu?. I don't like the stock cooler plastic screws...the plastic in that side plastic screw broke. it is only made for one time installation.
I am planning to buy a good case later...My dilemma is if i put too much fan , it will make too much noise and consume more power from my power supply (using 485 w noisetaker PSU). So i rather put one case fan.

Which case is the coolest airflow design with case fan? Also i am looking for a design with side loading for hard disks...

Any chinese made cheap case but better design?.

 

[SerpentRoyal]

Some Asus boards (P5B Deluxe) run HOT and require extra cooling. An 8 phase board does not necessarily provide better overclocking over a well-designed 4 phase board. The downside is more heat and more noise since you will need to increase air flow across the case to keep things cool. Having fancy heat pipe StackCool don't do squat to lower the temperature unless you have a way of moving more air or cooler air thru the case.

 

[Cutthroat]

Since you have a cheap case you should see where it is possible to mount case fans. One at the back exhauting the hot air is a must. If there is a spot for an intake fan on the front that's great, but if not as long as the case has vents on the front the negative pressure inside the case will draw in the air without a fan. I'll bet 1 or 2 case fans and a decent cpu cooler will do the trick for you. Personally I like the Noctua Ultra Silent 120mm fans if you can get your hands on them and they fit in the case. You can also modify the case to stick more fans in, but I don't think you will need to.

Check out the graphs in this article to get an idea of the best coolers around today. Depends on quite a few factors as to which to buy, do your research.

 

[Alexk400]

I know how to design a pc case that can cool better than others. People will immediately copy that design. So...

Video card heat and Cpu heat has to be separated.

Need 3 fans.

Front side big fan has to be suction mode with filter. we do not want to suck the dust from outside to inside. filter should be cleanable from outside.

Side fan has to be in lower middle just below graphics card. The other one just back of the case below powersupply to suck the heat from cpu and PSU.

There is long plastic separator that separate heat from cpu and video card. It can be mounted on to case side door.

We just create a Air flow model so that we compartmentalize the heat and remove it quickly before it spreads to all components..

Also the front side fan Air flow goes up and and come down.

It is kind of like creating AIR duct inside the case. To simplify the installation , All air duct plastics are on the case 's side door. Also wiring conduits should be build on the case itself to avoid unnecessary cut on the cables.

Ok now you got my idea . comment on it.

If i have money and material , i will build state of the art PC case.

No need for aluminium to super cooler technolgy...

Basic heat dissipation and keep the heat close to the vent and a heat carrier (air ducts).

here two fan doing the job...
http://www.sunbeamtech.com/index-2.html

Instead one fan with two duct. Speed of the 2 exhaust fan will decide the volume flow of air in each duct.

 

[Alexk400]

Also i move power supply to bottom and provide a Fan the top side.

I do not like a Fan on the side. It is not easy to open the case with wire connected. Side door should be passive without any electrical stuff on it. It should only have air duct structure. So it will be easy to open.

 

[SerpentRoyal]

I see one small issue with that article. Mounting those coolers in a standard mid-side doesn't tell me much about the intake air temperature AT THE CPU COOLER. If the case has NO side intake vent, then the intake air temperature will roughly be the same for all CPU coolers. However with a side intake vent, a down-firing cooler like the Big Typhoon will be able to use room temperature air, instead of case temperature air (usually heated by 3C to 5C from the HDD) for cooling. This will reduce the max temperature of the CPU by at least 2C.

For example, my Antec SLK3000B has a side vent. If I close the side vent, then the peak CPU temperature goes up by 3C. I have one 120mm x 38mm medium speed Panaflo on top of the Big Typhoon. Also have same fan at the intake and exhaust vents of the case. The Ultra 120 Extreme is a very good cooler, but its actual performance isn't that much better than the BT with a side duct.

 

[Cutthroat]

Alekk400, for the most part you just described the Antec P180 or Antec 900 series cases.

The only thing you have new is a separator between the CPU and Video card, but it wouldn't be practical, it would be very difficult to run your wiring around it. These cases are huge already and difficult to wire due to the bottom mounted PSU.

 

[Alexk400]

Side mounted vent and fan are simplified design but not effective one. To remove overall heat inside the case , you really need heat carrier (air) with definite direction not all around.

1. Air has to be sucked from front. The heat is carried from Front side components to up and come down with two ducts open (one for video card area and another for cpu Area.

2. Our air ducts is not 100% tight but its job is to direct most air into certain direction so that heat goes through vent instead spread around with all current cases.

3. I will completely avoid side vent. (if u have side vent there won't be air flow in a definite direction. it might remove some heat but it also spread the heat because of its suction of air from back.

4. we need to get cooler air (which is front side) and push it to back side. This is our general direction of heat carrier. we can improve upon it by tinkering with air duct for different installations.

 

[SerpentRoyal]

Hmmm...so you disabled the front and rear fans? I suppose the thermal engineers at HP are stupid because they rely on a slotted side panel for ventilation. This is the CHEAPEST way to drop case temperature by 2 to 3C! HDDs are often mounted at the front to take avantage of the colder air temperature. By the time this air reach the CPU cooler, it will already warm up by at least 5C.

 

[Alexk400]

Flowing air will not be a problem. As long as the air keep circulating that causes increase in temperature. Engineers in HP is not dumb , so is other people. I believe in need and simplicity drives the invention.

I really think all PC cases are outdated setup. No one really trying to change it because it is not profitable to spend time on case design.

What is the net temp reduction by having great design and ok design with simple vent close to heat source?.

Not much in short time as most pcs are obsolete in few years..

I still think if you are a overclocker with just air cooler , you need a better case design. I have n't seen one that impressed me yet.

Pc should have less fans to keep noise down , power down. Efficient cooling should be achieved by air duct design with constant air flow in one direction.

 

[Alexk400]

Please tell me your best 3 PC cases (including server cases). Thanks.

 

[ielmox]

Alexk400, I definitely agree that it is important to create good air ducts. Based on that reasoning last Sunday I went looking for an *affordable* case available in my area that met the following criteria:

- 12 cm fans on front and back (not counting PSU) to establish solid uni-directional airflow
- dust filters to reduce dirt buildup, since accumulated grime compromises cooling and is a pain to clean
- as airtight construction as possible (most cases have holes and vents everywhere, which disrupts the air flow we are trying to achieve)

And I had a really hard time finding something suitable. I ended up buying a NZXT Hush case (USD 83) because it was the only one I found that met the above three criteria. In particular I was impressed with the almost total lack of gaps, holes, vents, etc. I am still building the system but I came across a VERY interesting review that specifically measured air flow:

http://www.overclockersclub.com/reviews/nzxt_hush/9.htm

In spite of the limited (compared to other solutions) fans and air intake, this case appears to have excellent airflow, which would validate my criteria (and yours too) for selecting a case. It will be a while longer before my system is finished but hopefully the results will be positive.

I don't agree that partitioning the inside of the case is a good idea. Splitting the air flow so dramatically means that in every partition there is less air mass to absorb and carry away heat, but I could be wrong.

 

[Alexk400]

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