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Case fans & Cooling questions

post #1 of 13
Thread Starter 

I just bought my HAF 912+, and i'm trying to organize the cooling on it, preferibly positive pressure.

I plan to use 4

fans (once the filters arrive, right now it's bare) and my H70 as intake (right now with stock fans, later it'll have GT 2150's, signaled in green). PSU is mounted with the fan going down so it can get cool air and don't throw hot air to the video cards, just like the picture.

I also ordered some that will be attached to every fan, be it intake or exhaust.

I also plan to hook up all my fans to a Vantec NXP-205-BK Fan Controller which is rated to 18w per channel.

Also, no fans on the 5.25' cage, since i'm using 3 out of the 4 available (disc burner, sound card front panel, 5.25 to 3.5' adapter for fan controller).



Got some questions about my setup:

- Is this a possitive pressure setup?

- Is it good enough?

- Are there any better (and cheap) case fans?

- Should i add one more fan on the side window over the video cards as intake?

- Approx fan power consumption for the CM fans would be drawing ~2w per fan, and the GT2150's (assuming 0.5A per fan, if it is more please tell me) would be drawing around ~6.5w per fan. Could i connect two fans (considering the power requirements) with Y-adapters, to one single controller hub and be safe? I don't plan to let them run wild as well, i might be running the GT 2150's at min speed unless it is damned hot, and the case fans at x speed depending how hot it is.
Edited by Starbomba - 7/16/11 at 6:22pm
   
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post #2 of 13
The fan controller is good

And those fans are good for their price and 44.73 CFM is good considering
post #3 of 13
Not a bad setup .

For the price those fans will suit you just fine. I'd recommend a intake for the side to help bring in fresh air and cool your videocard.

If you'd like an alternative though I can vouch for Yate Loons from Jab-Tech. They're cheap and reliable. 3.60 a fan as well.

One thing you might want to give a try that some people have had great luck with is flipping your top fan so it intakes air to the heatsink which is then expelled out the rear. Results can vary so it might not be best for you but it doesn't hurt to try.
Edited by Siegfried262 - 7/16/11 at 7:39pm
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post #4 of 13

No, don't get the Cooler Master Silent fan, I own one of those fan and it barely push any air

If you want some cheap and good fan I suggest you to get this


Edited by CiX - 7/16/11 at 6:49pm
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post #5 of 13
Very Good set up I Think you have good air CFM

Good Luck with your system !!!!!!!!!!!!!!
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by ryanbob1234 View Post
And those fans are good for their price and 44.73 CFM is good considering
The only reason i bought them is that they're darned cheap and pretty decent (i mean, locally they are $15, but $3.50 per fan? madness ^^)

Quote:
Originally Posted by Siegfried262 View Post
For the price those fans will suit you just fine. I'd recommend a intake for the side to help bring in fresh air and cool your videocard.

One thing you might want to give a try that some people have had great luck with is flipping your top fan so it intakes air to the heatsink which is then expelled out the rear. Results can vary so it might not be best for you but it doesn't hurt to try.
- Thought so. Good thing i still have one controller slot free after everything is connected

- I also thought on that, but i was thinking the airflow might interfere with my H70, as it is mounted as intake, not exhaust.

Quote:
Originally Posted by CiX View Post
No, don't get the Cooler Master Silent fan, I own one of those fan and it barely push any air

If you want some cheap and good fan I suggest you to get this
Amazon.com: ARCTIC COOLING F12 120MM 1350 RPM FAN: Platinum Micro, Inc.
Those were one of my options, actually (i own 2 F9's on my HTPC, darned silent and they push a lot of air), but the price got me thinking a lot (after all, i need 5)
   
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post #7 of 13
Normally when people buy excellent cases like the HAF, it's best to run with stock fans for a while. If you want a positive pressure case, flip the top fan to make it an intake, and block off the rear position to improve flow.

If you want to graduate from positive pressure to positive flow, cut out your rear grill and use the rear fan somewhere else.

Anyway, congrats on getting a good case.
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post #8 of 13
Thread Starter 
Quote:
Originally Posted by ehume View Post
Normally when people buy excellent cases like the HAF, it's best to run with stock fans for a while. If you want a positive pressure case, flip the top fan to make it an intake, and block off the rear position to improve flow.

If you want to graduate from positive pressure to positive flow, cut out your rear grill and use the rear fan somewhere else.

Anyway, congrats on getting a good case.
Well, first things first, what is the difference between positive pressure and positive flow? And which one is the best to keep dust away from the case?

I usually have a healthy routine of cleaning my cases every 1-2 months, dust them off, reapply TIM, and reinstall everything, but now with college+work+RL i barely get time to enjoy my PC (and when i do, i game ). That is the reason for the air filters, hopefully i can now extend the cleaning of my cases at least once every 3 months, just cleaning the filters once a month or so.

I also want to get a good air circulation on my case to improve overall temps. I'm satisfied with my CPU temps (~60c on full IBT load) but sometimes, when i operate the case to try anything (if anything starts) i feel it a tad too hot for confort, especially the VRM's (i'll adapt a 40x40x20mm fan for the VRM heatsink, but i want some fresh air, not hot air blowing on it) and the video cards, as they're single slot models, tend to run a bit warmer, and i want to help them a bit.

If i were to block the back intake, would i place the H70 as intake or exhaust at the top?

Also, thanks. I picked it not for airflow or appearance, but because it was the only case that would let me mount all my HDD's (and more since i plan to increase the amount), H70, and with a bottom PSU base. But yea, it being a High Air Flow, i'd better hone it's name
   
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post #9 of 13
Quote:
Originally Posted by Starbomba View Post
Well, first things first, what is the difference between positive pressure and positive flow? And which one is the best to keep dust away from the case?

I usually have a healthy routine of cleaning my cases every 1-2 months, dust them off, reapply TIM, and reinstall everything, but now with college+work+RL i barely get time to enjoy my PC (and when i do, i game ). That is the reason for the air filters, hopefully i can now extend the cleaning of my cases at least once every 3 months, just cleaning the filters once a month or so.

I also want to get a good air circulation on my case to improve overall temps. I'm satisfied with my CPU temps (~60c on full IBT load) but sometimes, when i operate the case to try anything (if anything starts) i feel it a tad too hot for confort, especially the VRM's (i'll adapt a 40x40x20mm fan for the VRM heatsink, but i want some fresh air, not hot air blowing on it) and the video cards, as they're single slot models, tend to run a bit warmer, and i want to help them a bit.

If i were to block the back intake, would i place the H70 as intake or exhaust at the top?

Also, thanks. I picked it not for airflow or appearance, but because it was the only case that would let me mount all my HDD's (and more since i plan to increase the amount), H70, and with a bottom PSU base. But yea, it being a High Air Flow, i'd better hone it's name
Ah. I forgot your case has only a single top fan. I was referring to a double top fan position. In such cases you can make the forward top fan an intake, and the aft top fan position closed, to maintain a wind tunnel effect.

Positive pressure is when you build up a positive pressure in a case because you have more intake than exhaust. It slows down your airflow, but if your intake fans have filters you get little dust buildup. A negative pressure case is where you have more exhaust than intake. Those cases get dusty because unfiltered air gets drawn in through every crack in the case.

I like what I call positive flow cases. If your exhaust port(s) is(are) open, no pressure can build up. Instead, the air flows out. That's what I do myself:



I also had a negative flow setup once. I had two fans on a Megahalems and zero case fans running. The rig was pulling air in through every port. Look at item 2 in my sig. I was calling it a negative pressure rig then. Now I know it's not.
Edited by ehume - 7/17/11 at 1:07am
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by ehume View Post
Ah. I forgot your case has only a single top fan. I was referring to a double top fan position. In such cases you can make the forward top fan an intake, and the aft top fan position closed, to maintain a wind tunnel effect.

Positive pressure is when you build up a positive pressure in a case because you have more intake than exhaust. It slows down your airflow, but if your intake fans have filters you get little dust buildup. A negative pressure case is where you have more exhaust than intake. Thos cases get dusty because unfiltered air gets drawn in through every crack in the case.

I like what I call positive flow cases. If your exhaust port(s) is(are) open, no pressure can build up. Instead, the air flows out. That's what I do myself:



I also had a negative flow setup once. I had two fans on a Megahalems and zero case fans running. The rig was pulling air in through every port. Look at item 2 in my sig. I was calling it a negative pressure rig then. Now I know it's not.
Actually my case can fit either 2 120mm fans at the top (what i plan to use) or a single 200mm fan (i think it can handle 2 140mm fans, but i do not have those)

Also, thanks for the image. Just a quick question: Can i just get rid of the 5.25' cage fan for this to work properly? As i stated, i have no room on my cage, as 3 out of the 4 ports are filled, and, at most, i can get only one more free. Plus, how would this work with an H70, as the pic assumes a regular heatsink? Would i just move the CPU fans to the right and still block the first top position?
   
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