P180, TRUE 1366 - Fan config questions

[RhysG]

Hi all, just a quick question about how to best setup the fans in my P180 with a TRUE 1366 on top of an i7 920. Probably best represented pictographically:


Click to view full size!

If anyone can help me with choosing the best setup that would be great.

[Dr1fty]

It is always best to have positive case pressure.

IOW: More input pressure than output. By doing so you end up with air blowing out each hole and preventing dust from entering.

Though, you don't want to draw air in from the rear as a general rule of thumb.

For your setup I would reccomend the following:

Front: Intake
PSU: Both intake (if possible)
VGA ? What type of fan are we talking here, I assume dual slot card and if so, then don't even bother counting it.
And have the top rear exhaust.
Top as exhaust as well due to being too close to the rear of the case.

In reality the case design sucks. (Sorry, but its true)


Ideally you want a 12m intake at front, 120 exhaust at rear. Making sure you have a higher CFM at the front than the rear to create positive pressure.


Here is my setup.

[terrastrife]

upwards.

this is more to do with the true probably performing better with the pipes all horizontal than anything else.

im confused with your psu fan picture? not that it matters.

im in the school of negative pressure. who needs an intake when its not going to make sweet fuck all difference to pressure when you can have a single exhaust fan with strategically positioned vents so you can perfectly design your air channeling. ie, vents infront of your hdds and just to the other side of your video card, this makes the exhaust over the drives and video card, which is where you want the flow to be happening, not through some random holes that go no where.

[Dr1fty]

Originally Posted by terrastrife

upwards.

this is more to do with the true probably performing better with the pipes all horizontal than anything else.

im confused with your psu fan picture? not that it matters.

im in the school of negative pressure. who needs an intake when its not going to make sweet fuck all difference to pressure when you can have a single exhaust fan with strategically positioned vents so you can perfectly design your air channeling. ie, vents infront of your hdds and just to the other side of your video card, this makes the exhaust over the drives and video card, which is where you want the flow to be happening, not through some random holes that go no where.

Not dissing your opinion etc.. But if you could elaborate as to why you believe heatpipes work better all at the same level as opposed to being on top of one another. (vert/horiz alignment of HSF)

From my understanding of heatpipes, its vapor, and it travels to the cool end etc.. I can't see how being mounted differently would make any difference. And if we wanted to be anal about it, vertical is the way the heatpipes should be, so once the vapor turns back to liquid, it flows back down to the "hot" end.

Do you find much dust in your PC due to negative pressure ? I find having the intake ports clear from dirty floors, and clean filters on them that no dust really gets in. I would hate to think of where it is picking shit up from with negative pressure in case. I dunno, but to me it just seems illogical.

Only my opinion though.

[mojododo]

i think in the install instructions (or i read it somewhere) that its best to have the true120 pointint towards the rear exhaust fan, this way it can setup a sortof push/pull with the exhaust fan and the fan on the true120.


i personally run a negative pressure design. 2 fans in, 3 out +psu out. i dont find much dust at all, and i clean my pc once every 3 or so months.

i think pc cases will be more affected by where the exhaust fans are as opposed to neg/positive pressures.

heat rises, law of physics.... put your exhaust fans nearer the top of case, ie the top exhausts and rear top exhausts.

having your psu blow air into the case is silly.... lets draw hot air inside the case...

[Dr1fty]

Originally Posted by mojododo

i think in the install instructions (or i read it somewhere) that its best to have the true120 pointint towards the rear exhaust fan, this way it can setup a sortof push/pull with the exhaust fan and the fan on the true120.


i personally run a negative pressure design. 2 fans in, 3 out +psu out. i dont find much dust at all, and i clean my pc once every 3 or so months.

i think pc cases will be more affected by where the exhaust fans are as opposed to neg/positive pressures.

heat rises, law of physics.... put your exhaust fans nearer the top of case, ie the top exhausts and rear top exhausts.

having your psu blow air into the case is silly.... lets draw hot air inside the case...

I'll agree with you on the PSU.. I have no fuckin idea why I wrote that. lol But its strange he's got 1in/1out for PSU.

Generally, fans work better when they are pushing against something, rather than pulling. I'll stick with the push/pos pressure than pull/neg.

[o0pz]

In my P182, my TRUE's facing the rear exhaust fan also. Tested it with it pointing upwards towards the blow hole and the temps were only about 2-3 degrees difference compared to how it is now. I think it was due to the Vid card having a glacier and blowing warm air downwards then being sucked back up again.

So my P182 basically has this setup.
Intake: 12cm Noctua where the removable HDD cage is under the Optical Drives [HDD Cage is removed]
Out: Top 12cm Noctua blow hole, Rear 12cm Noctua exhaust.

True is setup in a push/pull design.
PSU makes no difference because it's chambered off

[terrastrife]

Originally Posted by Dr1fty

Not dissing your opinion etc.. But if you could elaborate as to why you believe heatpipes work better all at the same level as opposed to being on top of one another. (vert/horiz alignment of HSF)

From my understanding of heatpipes, its vapor, and it travels to the cool end etc.. I can't see how being mounted differently would make any difference. And if we wanted to be anal about it, vertical is the way the heatpipes should be, so once the vapor turns back to liquid, it flows back down to the "hot" end.

Do you find much dust in your PC due to negative pressure ? I find having the intake ports clear from dirty floors, and clean filters on them that no dust really gets in. I would hate to think of where it is picking shit up from with negative pressure in case. I dunno, but to me it just seems illogical.

Only my opinion though.

sealed water, with or without a cloth like wick. most boards dont have wicks which is why therye useless in upside down cases.

there are very few vapour based heatpipe setups.

if you look up some reviews that do testing in both orientations + desktop orientation youll find that theres a good 10-15% difference between orientations.

[RhysG]

Thankyou for your input. The PSU is an old Antec SP2 500W and comes standard with dual 80mm fans, one intake and one outtake. I just put them in the diagram to shut anyone up asking about the PSU and its effect on pressure even though it is isolated from the rest of the case.

I get a fair bit of dust in my case which may be due to negative pressure from the greater amount of outtakes (or my cat ). The fans are all aftermarket Scythe S-Flex 1900RPM that push 75CFM (intakes have washable filters).

My case is not in the most open position (under a desk). If I change the top fan to intake this will promote positive pressure thereby reducing dust but wouldn't it create turbulence around the CPU, with hot air rising and the TRUE fan pushing rearwards. This may not be the best idea... any thoughts or just leave the top as exhaust and keep cleaning the case every month or so.