Case fan direction

Cochise · Post by **Cochise** » Wed Jun 08, 2005 3:32 am

Sorry for the silly question, but...
what's the right way for case fan, blowing into, or extracting?

next to nothing · Post by **next to nothing** » Wed Jun 08, 2005 4:28 am

in my setups the fan in front draws air into the cabinet while the one on top of the back exhaust air. this gives a good airflow, just make sure your cables etc. are tidy.

Cochise · Post by **Cochise** » Wed Jun 08, 2005 5:31 am

Thanks for reply.
I'm gonna place the fan on rear panel;
my case haven't front fan seats; maybe with mini fans in a optical disk seat I could add front fans.
I use a power supply fan with just 2 wires (no rotation control) so I'll connect it to a 12V HDD power plug with a male plug I've scraped up from an old PC; I've soldered wires in the plug; no electric risks for the hardware.
I hope the air flow be correct.

[ This Message was edited by: Cochise on 2005-06-08 06:35 ]

Post by **hubird** » Wed Jun 08, 2005 5:55 am

Cochise · Post by **Cochise** » Fri Jun 10, 2005 4:45 am

OK, thank you.
The fan is operating now and I can gauge 33 C° into the case at the top, near cpu fan, but it's not too hot here today.
Intel reccommend 34° C for Prescott (38 max)so, I think other fan's needed

[ This Message was edited by: Cochise on 2005-06-10 08:10 ]

Cochise · Post by **Cochise** » Sat Jun 11, 2005 2:12 pm

Lafayette DT-21 multimeter

Pc probe software give me now this values:
Cpu temperature 46°C
Motherboard temp 38°C
I've set it in recording mode and along a cople of hours of work the values are always around those

[ This Message was edited by: Cochise on 2005-06-11 15:48 ]

Cochise · Post by **Cochise** » Sat Jun 11, 2005 2:19 pm

On 2005-06-10 15:41, stardust wrote:

I do not think that 36 degrees is really to high, since P4 have a overheating throttle anyway.

It's that throttle worry me.
bad ventilation ==> bad performaces

maakbow · Post by **maakbow** » Sun Jun 12, 2005 12:57 am

The presure ballance is wrong and inefficient if you have sucking and blowing fans...I studied this heaps.

IBM and INTELL have whitepapers on this and other fan companies etc.

Use all sucking or all blowing...sucking prolly better as ps will suck.

Two sucking fans wil pass more air than 1 sucking and 1 blowing..in fact in some situation 1 sucking and 1 blowing can pass less air than just 1 fan.

Usually holes in front lower down and fans at back higher up is best.

Make sure area of air hole comming into the box is exactly same area as going out.

Block all silly other drilled holes in case.

direct air inside with stuff so it flows over the correct places.

Maak

[ This Message was edited by: maakbow on 2005-06-12 01:58 ]

Cochise · Post by **Cochise** » Sun Jun 12, 2005 12:19 pm

Thank you very much, guys.
I was in the apposition to think about ice bags for my pc on August

just kidding

It seems no bad, but I'll watch temperature, for a while.

On 2005-06-12 03:29, stardust wrote:
yout PC probe values are good if your idle or low loaded. They are excellent under real high load conditions like 3d gaming.

I would not sacrifice quietness for spec values

Just light tasks.

Quitness is another point sholdn't be not underrated

Cochise · Post by **Cochise** » Mon Jun 13, 2005 12:22 pm

Prescott fan is quite noisy; unluckly it's also quite busy to replace.

Cochise · Post by **Cochise** » Tue Jun 14, 2005 5:56 am

My new PSU have two fans.
It's probably this the reason of the increased noise I can hear from the actual PC.

CroNiX · Post by **CroNiX** » Tue Jun 14, 2005 2:11 pm

I have my fan completely in the other room and have barely any noise (just moving air). All I did was take a 4" laundry dryer ducting with a fan attached (pulling air) and connected the other end to the computer case at the top. The fan end is located in the next room. I realize that this isnt for everybody (I drilled a hole in my wall to pass the ducting through) but if you can do it and want maybe 5% noise from a regular setup I would suggest it. Very ideal for a recording situation with open mics.

Cochise · Post by **Cochise** » Thu Jun 16, 2005 7:59 am

On 2005-06-11 15:12, Cochise wrote:
Pc probe software give me now this values:
Cpu temperature 46°C
Motherboard temp 38°C
I've set it in recording mode and along a cople of hours of work the values are always around those

[ This Message was edited by: Cochise on 2005-06-11 15:48 ]

It's not exactly so.
Running PC probe during a benchmark session I can read peaks til 63°c for CPU, while MB temperature gradually raises till 39° after 30 min of work.
Don't you think the best overclock way is disabling CPU temperature management in the BIOS?
Maybe just a bit dangerous...

Immanuel · Post by **Immanuel** » Sun Jun 26, 2005 5:10 am

I like to have over preasure in my PC - the difference in having over preasure and under preasure is ... dust

dehuszar · Post by **dehuszar** » Tue Jun 28, 2005 8:45 am

Also, try and get your combined airflow in (I think CFM is the measurement that fan and Power Supply folks spec with) and your airflow out are as matched as you can. So if you have (pulling # from my ...) 60CFM from your intake fan, you should try and get as close to 60 CFM out as you can, including your power supply fan in the outtake figure.

You'll always get a little bit of drag against cables and PCI cards, but if they are too mismatched, you may just circulate hot air internally, or not get certain cards and parts to benefit from the breeze.

Sam

Cochise · Post by **Cochise** » Wed Jul 06, 2005 4:01 pm

Take a look at the P4 LGA 775 datasheet
pages 76=>78.
If I don't misunderstand, at different power demand correspond a different temperature limit...

Cochise · Post by **Cochise** » Wed Jul 06, 2005 4:17 pm

Do I have to connect the multimeter in series with the core to get the absorption?

Those 63° could be good or not, I can't know.

Cochise · Post by **Cochise** » Mon Oct 10, 2005 3:59 am

In the hope this can be usefull for anyone else.

I've found solution by this free utility
ThrottleWatch (www.panopsys.com).
It shows CPU work freq and Thermal Throttling activity in real time.