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Haf X owners, colder temps when adding 2nd 200mm fan on top? - Page 3

post #21 of 62
i have read that numerous people do not see much of a temp difference with the second top fan.
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Air 540
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post #22 of 62
Quote:
Originally Posted by sockpirate;12402024 
i have read that numerous people do not see much of a temp difference with the second top fan.

I would think a second top fan might not do too much for positive airflow. That may be a reason why it's sucking cooler air out whereas the lower compartments on the case are sucking in the cooler air, simultaneously. Perhaps the cooler air from the 5.25 bays is only adding to the negative pressure and the cooler air being sucked in via the vented pci lanes is only the recycled air from the gpus. I think that may be why the hsf might be starved from fresh cooler air.

Just a theory. I have to experiment with my Haf x and see why my D14 isn't getting cooler temps with this new case, compared to the cosmos 1000.
    
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post #23 of 62
Quote:
Originally Posted by Siegfried262;12399958 
You might be getting higher temperatures from the optional top fan prematurely exhausting fresh air from the other intakes before it reaches your other components.

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This.

I'm by no means a professional, but I experiment a lot with different cases, and airflow, and different fans from different manufacturers.

When you have fans as intakes in the 5.25" bays they tend to squirt some air up towards the top exhaust.
Please take a look at the video at the bottom of this link to see what I mean in regards to airflow of the majority of fans on the market.
They tend to shoot it out towards the sides

http://www.silverstonetek.com/tech/wh10_0061.php?area=usa

If you take a look at this link below, please take note of point # 6
You will notice that in the case of the HAF - X you have 3 fans all fighting to suck air out of the case.
http://www.silverstonetek.com/tech/wh_airflow.php?area=usa

Essentially starving each other raising temperatures from lack of air intake. (goes back to the principles of negative & positive air pressure in the case)

I mucked around with my own HAF X a bit. I ended up swapping out all the original fans and replaced the 200mm x 3 with the CM Megaflows in blue (original stock fan in the top was defective, and I like the colour more tongue.gif) along with the front 230mm with a 200mm CM Megaflow.
I turned the front top fan into an intake, and I also have a 140mm air penetrator pushing the air that is being taken in from the 5.25" bay, directing it at my cpu heatsink (fresh cool air drawn in from both top, & the front mesh panels)

Also have a 120mm blowing over my video cards towards the rear, and out the grilles there.

I also replaced the rear fan with a noctua 140mm fan to move more air.

Dropped my temps quite a few degrees, went from 36 degrees on idle to 27 degrees.

I could alternatively flip the rear 200mm top exhaust fan to intake as well, however I looked at the way air was flowing towards the rear fan, while it ideally is forced through the rear chassis exhaust, I noticed some air circling between the top corner around the top 200mm fan. (I used some dry ice & water to pump some mist into the case to test:D)
Anyhow, I just left that fan as an exhaust, to eliminate that dead spot.

Now airflows from the front to back in a relatively smooth manner.

TL;DR
Experiment around with your case, and see what setup you like.

Hopefully you're able to get things to work out nicely.
Edited by Xinc - 2/15/11 at 10:15pm
post #24 of 62
Is it advisable to add optional 200 mm fan on the top of the case?
post #25 of 62
Thread Starter 
Quote:
Originally Posted by anand_n;12403573 
Is it advisable to add optional 200 mm fan on the top of the case?

well according to a few on this forum, its either no difference....or as for my case, i lost performance (gained temps) with the optional 200mm exhaust mounted

thanks for the great explanation xinc!
Edited by steven88 - 2/15/11 at 10:35pm
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post #26 of 62
You don't absolutely have to add the optional 200mm fan.
Its personal preference, and it depends on what your goals are with your computer & case.
The empty fan slot will passively move air both in and out as it is.

I love this case, and think it has great air flow, however I found my temperatures at load getting a tad high while rendering and folding.
So I sacrificed having lower noise levels, and gave it more airflow.
post #27 of 62
Quote:
Originally Posted by steven88;12403639 
well according to a few on this forum, its either no difference....or as for my case, i lost performance (gained temps) with the optional 200mm exhaust mounted

thanks for the great explanation xinc!

No problem.

Happy to learn from everyone here, and happy to share anything I've observed from trial and error myself.

cheers!
post #28 of 62
Quote:
Originally Posted by steven88;12399926 
my GPU is a reference gtx 570...it doesn't spew hot air into the case...its an external exhaust

and what do you mean by the highlighted portion?
The heat rising off the back off the video card is likely going directly to the rear exhaust. When the 2nd top fan (closest to 5.25 inch bay) is exhausting, more of that heat is going towards the direction of the CPU cooler intake fan.

It depends upon the design of the case, but I actually get better temps with top intake. My case has vents on the back so positive pressure pushes the hot air out through those.
post #29 of 62
All I can say is to play with those "optional" fans you added. Turn the top exh off and see what the result is. Then turn that optional top fan back on and then turn off the optional 3 x 140's (isn't this a bit overkill?) and see what the result is then. Afterwards, add just 1 x 140 to see how that goes.

You will only find out by experimenting. Document and post here. I am sure ppl will be interested in your results. I know I would. HAF X is an upgrade choice of mine and living in the tropics, this is an issue when you consider high ambient temps.

Thanks in advance if you go through this.

My idea is that the intake 3 x 140's may be creating a disturbance of air flow that is not working in favor of that intake fan on your heatsink and therefore that's where your higher temp's are coming from. In essence, the 3 x 140's may just be pushing fresh air past the heatsink instead of healping to push it into the heatsink. Just a theory though.

EDIT: Also... fans had sort of a dead spot in the center. That is the idea of using fan shrouds on radiators in water cooled systems. Those 3 x 140's seem very close to the HSF fan and may be sending that dead air flow spot to the HSF instead of fresh air. Example here:

flussi.gif
Edited by Kahbrohn - 2/16/11 at 2:24am
post #30 of 62
Thread Starter 
Quote:
Originally Posted by Kahbrohn;12404825 
All I can say is to play with those "optional" fans you added. Turn the top exh off and see what the result is. Then turn that optional top fan back on and then turn off the optional 3 x 140's (isn't this a bit overkill?) and see what the result is then. Afterwards, add just 1 x 140 to see how that goes.

You will only find out by experimenting. Document and post here. I am sure ppl will be interested in your results. I know I would. HAF X is an upgrade choice of mine and living in the tropics, this is an issue when you consider high ambient temps.

Thanks in advance if you go through this.

My idea is that the intake 3 x 140's may be creating a disturbance of air flow that is not working in favor of that intake fan on your heatsink and therefore that's where your higher temp's are coming from. In essence, the 3 x 140's may just be pushing fresh air past the heatsink instead of healping to push it into the heatsink. Just a theory though.

3 is definitely overkill...I started off with 2 140's...one on the very front of the 5.25 bays...and the other one further into the case, closer to the cpu heat sink.....then newegg had a killer deal for a xigmatek CLF 140mm red led fan...for like $2 shipped after rebate...so I said why not?

I dunno, as of right now I took off the optional 200mm top fan....this setup right here seems to give me the best results...

Another idea I have thought about was....flip my rear 140mm exhaust into an intake...then flip my noctua D14 around so it intakes cold air from the rear and blow out hot air through the front....then put two 200mm on top as exhaust....i'm not sure if that would help...i mean, the back of my case is up against a wall...and the GPU spews out hot air there too....but yeah, that was just an idea
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