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post #1441 of 4392
I have just removed the resistor on the Scythe Ultra Kaze which is my rear exhaust fan and allow it run at the full 12V. Temps got noticeably better. Attached them below.
I've put my hand at the exhaust I can feel hot air blowing out. Didnot observe that before. It was always blowing out marginally cold air not even warm earlier. So I guess reversing the top fans to act as intakes has a negative effect on the cooling performance of the case.

I'm signing off for the day. Tomorrow I will be working on redoing the CPU cooler.


Edited by maverickpk - 5/1/10 at 9:37am
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post #1442 of 4392
Quote:
Originally Posted by Mattb2e View Post
Yeah, im using the air duct currently, thats why im so high on the exhaust cfm's, im not sure about the whole vortex thing. I wish I had a way to measure case flow to see how certain things effect air flow in and out of the case.

Switching the two top exhaust fans would undoubtably make the case a positive pressure case, however as you said, there could be some lingering air. IDK, ill see how it goes tomorrow, ill run some benchmarks and see if any of the fan configurations effect temps at all.
how much has ur air duct usage improved ur gpu temps???
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post #1443 of 4392
@maverickpk

your testing proves two things: the ATCS840 has an excellent cooling system; and the laws of thermodynamics.

In the original setup (both top fans exhaust) the heat from all sources distributes throughout the case and is slowly exhausted at the top. Especially if the rear exhaust fan is throttled.

When the set-up is reversed, all the cool air being blown in gets chanelled (or is it channeled?) and rushes out the rear fan. Obviuously with higher temp and higher speed.

From reading the early posts of this thread, I gather that the best set-up is achieved by:
1. shutting down the inner one of the top fans, to avoid the cool air being exhausted before it ever reaches the CPU area.
2. Increasing the intake volume by adding a 120mm at the bottom, and/or a fan in the 5.25" cage. (Making a positive rather than negative pressure system.)

Thereafter it is only a question of tweaking sizes and speeds for low noise.

In my mod I am going as far as closing off the top (inner) fan opening and mounting the thus surplused 230mm fan to the front (=cutting the 5.25" cage).

I will not use the PCI exhaust box, because I have a 7950GX2. And I hope it will push all the heat out its own rear slots. I hope; we'll see.........
     
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post #1444 of 4392
Quote:
Originally Posted by humbleguy View Post
how much has ur air duct usage improved ur gpu temps???
I havent actually measured my temps, but I know for a fact that without the duct I was getting air that was cycling back through the pci slots, which is counterproductive if you want your warm air to exit the case from your gpu.

What I did was I had a piece of tissue, with all my fans on at 12v, full blast, I put the tissue up against the rear of the case. When the tissue was at the vent portion of the expansion slots (holes adjacent to the ports themselves), the tissue was sucked into the vent.

I found that to be proof that with the all of the fan locations occupied, with no air duct, that the case is a negative pressure case.
post #1445 of 4392
@mru

I already have a YL high speed as the bottom intake fan. To allow for easier passage of air, I've given more clearing on the bottom by attaching rubber pads onto the existing case feet. I have thereby effectively given a 1.5 inch clearing on the bottom.

@Mattb2e
I hope you had a good night's (or morning rather) sleep mate after you left midway thru my testing last night. hahhahahha
Have you already done the change to flip the fans over and read the temps?

I'll be doing the following test shortly from now.
Completely turn off the top fan towards the front of the case
- Read temps with the rear top fan as intake
- Read temps with the rear top fan as exhaust (like mru suggested)


Please take note here that I do not use the duct on my case. All the readings I've posted earlier are without the use of a duct.
Edited by maverickpk - 5/1/10 at 2:04pm
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post #1446 of 4392
@maverickpk
use matt2be's test to check if air flows in/out of case. (I usually just scotch tape a single layer of multi-layer toillet paper - unused of course!!!!!!)
     
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post #1447 of 4392
Ok so I did a couple tests here. I didnt move both 230mm fans on the top to intake, just the one towards the rear.

First test is Idle and Load temps with the stock fan setup, with both hard disk cage fans enabled and the lower optional 120mm intake fan on as well. I used the expansion slot duct for all of these tests. All tests are with a 27c ambient.

First photo is the stock cooling at idle, nothing too exciting, about 42c.



Second photo is at load with the stock fan setups, 61, 58, 58, 59



Third photo is an idle photo with the rear 230mm fan as intake and the front as exhaust. I noticed an overall 1c decrease in all cores. 42,41,41,41



Fourth photp is the rear 230mm as intake front as exhaust at load. I noticed the same 1c decrease in temps across all cores except core 2 which was hovering around 1-2c different.




So all in all I see that changing the rear to intake has improved my temps by 1c. Nothing to write home about, but a gain none the less.




Edited by Mattb2e - 5/1/10 at 10:18am
post #1448 of 4392
Have you tried the opposite? I mean the top rear as exhaust and the top-front as intake?
And are you using the fans on the 5.25 cage?
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post #1449 of 4392
Another way to assure adequate exhaust is to remove the rear grill (I know this gets repetitious) as well as the rear fan. Also, remove the slot covers from all unused slots. This allows the air to get out without building up pressure inside the case. Also, with one less fan you have that much less noise - and considering how much air you must exhaust that might be quite a noisy fan.

Quote:
I have just removed the resistor on the Scythe Ultra Kaze which is my rear exhaust fan and allow it run at the full 12V.
When you have time could you post a pic of the circuit board where the resistor used to be? And what fan did you mod? And what rpm is it running now?
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post #1450 of 4392
Quote:
Originally Posted by maverickpk View Post
Have you tried the opposite? I mean the top rear as exhaust and the top-front as intake?
And are you using the fans on the 5.25 cage?
Im using the fans that are stock addons for the 3.5" hard drive cage, I dont really consider those intake fans because they dont really pull in fresh air from outside the case, they more assist pulling the air that is intaked from the 230mm fan through the hard disk cage.

I havent tried the opposite, the fan closest to the front of the case is captured within my cable management setup, I would switch them, but dont feel like redoing hours worth of work haha.
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