Air Flow Diagrams

[uufta]

Someone posted some very informative case airflow diagrams
on DVF somewhere, and I cannot find them, it was very
recent...any help would be greatly appreciated.

gc

[uufta]

http://forum.digital-digest.com/showthread.php?t=69387

Never mind I just found it

[RFBurns]

Design Engineering 101.....

Good airflow is always a good thing. Those diagrams do show the proper way to set up fans for optimum cooling and airflow.

But...from an engineering point of view....its a bit overkill. Here is why.

The entire system is engineered for proper cooling right out of the plant. When one has to start adding fans, vents, ducts etc, there has to be some reason why the pc is getting hot, either more peripherials were added at a later date, drawing more current than the system is designed for, mainly the PSU. Thus one has to install a beefier PSU to handle the extra loads, and of course, the bigger PSU will in fact produce more heat, along with the voltage regulators on the MOBO.

The regulators, tho the supply voltages from the PSU are in fact regulated already before hitting the MOBO, add extra stability during load changes, such as when a disc is inserted into a drive and the motor spun up, or memory is accessed or CPU calculation power is required, it draws current from the supply.

Just because you get a beefier power supply to handle the extra draw of current, doesnt mean the system as a whole will perform better or run cooler, there are still components on the MOBO that have to handle those changes as well, and its almost impossible to beef up the regulators on the MOBO.

The best path to take is to simply have a system built that already has the extra capabilities of handling any extra loads placed upon it.

Force cooling may keep the heatsinks cool, but them poor chips mounted to them will still be producing extra heat within the chip itself. And adding more fans to an already overloaded PSU and MOBO wont solve anything, but add more to the load, often the loading outweighing any benefit hoped for by adding fans etc.

A properly built system with expansion designed into it should not require elaborate venting and duct work to keep things cool. Everything has a limit, and forcing something to do something it was not designed to do is eventually going to have problems that may end up byond recovery.

[uufta]

My simple little HP Semprion has a place for a fan in the back to be added, below the power supply, otherwise it has only the power supply fan and side vent holes, I just bought it in Dec. so I will go with this one for awhile until I am more computer savvy. thanks for your info alot...now all I need to know is do I mount it blowing in or out? and how do I hook it up.
(I have added a second burner and a second hard drive)

[Chewy]

the reason they have a fan hole there is for people that add stuff to their computer, monitor your computer temps closely, when your case(mobo) temps get 5-10C above the ambient(room) temp you are fixing to fry eggs.
The whole design depends upon keeping case temps low.

Buy the biggest quietest fan that will fit and have it blow out.

and plan on a power supply sooner or later, I hate those mini/micro cases, they stick it to you
for a power supply

[uufta]

Thanks Chewy
I am running way to hot then, my house is always around 70deg and my mobo and cpu are rarely below 100deg.
Cpu goes up to 115-125 after a couple of shrinks, went up above 155deg when I joined the folding team. Will the stock power supply in a Pavilion a1213 handle a new fan?

[Chewy]

My amd64(runs cool) is idlying 31C, mobo 28C, room 26C

looks like a standard size PS, add the fan, actually help by keeping some
of the hotter air from frying PS

[techreactor]

also the intel dual cores (not the core 2 duo) are much more heat emitting chips and if you plan to use them at 100% cpu the temps can go up from 40C(at idle) to 50C immediately and more depending on the air circulation and room temp + usage time.

My new case (i just changed it cos of PSU failure) has a sleeve on the side which goes right next to the processor fan(so that it sucks air directly from outiside) and an extra side vent + front vents. Which when supported by an fan in the back and PSU fan provide for sufficient air flow now.

Its something like this

[Chewy]

The large 120 coupled with a dual fan powersupply draw cool air directly to
the cpu fan and vidcard with that design, now make sure it's not sitting back in a cubby hole and just recirculating hot air. I would want one small fan down low blowing in the front. Leave the side off and test temps, watch them go down when you put the side on, then you know you have good design for cooling.

[techreactor]

The large 120 coupled with a dual fan powersupply draw cool air directly to
the cpu fan and vidcard with that design, now make sure it's not sitting back in a cubby hole and just recirculating hot air. I would want one small fan down low blowing in the front. Leave the side off and test temps, watch them go down when you put the side on, then you know you have good design for cooling.

There's one fan at the back and then a sigle fan in the PSU, no fans on the side or the front.

I actually didnt get you completely. Although the temp are already 7-8C lower with this setup for CPU and 1-2C for the MB (since its only a heatsink with no fan on it)

[Chewy]

the back of the case pictured was a 120mm fan hole, they work great!

they move more air and make less noise,

what's the difference in case temp and room temp?

[mill]

I had help installing a case fan awhile back and was informed not to run at full throtle, which was correct, because when i do it makes the temp of the mother board go up .It jumps from 36c to about 40c , so more is not necessarily better in my case.

http://forum.digital-digest.com/showthread.php?postid=363935#post363935

[techreactor]

what's the difference in case temp and room temp?

I dont know exactly but the case temp always starts at 40-41 and increases to 44-46 under full loads.(unless MBM shows wrong readings)

estimated diff should be around 10-12C(under idle)

Btw these are not exactly my case shots, I just took a ref pict since its similar.

If you look at the front of this ref case, you''l be surprised. I hope it wont blow away the CPU out of its socket and out from the back

[Chewy]

that's just an opening to keep the hard drives cool or the intake for a jet turbine engine?

actually those mobo readings(case) temps are northbridge based and some run hotter than others.

mill,

uncasms is very strong with the force

http://forum.digital-digest.com/showpost.php?p=364122&postcount=29

as long as I don't have to pay for his builds

[AlienX69]

What brand / model # of that case ..... link ... is there a mount for a 120 on the front too ?

I like the 120's fans too !