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

post #1 of 62
2/15/11 at 3:06am
Thread Starter 
Okay guys, I'm not sure if I am crazy or doing something wrong here...but here is my current fan setup

- factory intake 230mm front fan
- factory intake 200mm side fan
- factory exhaust 200mm top fan
- optional exhaust 200mm top fan
- factory exhaust 140mm rear fan
- optional intake 140mm fan mounted where the 5.25 bays are (three of them mounted inline)

Here is a quick picture for reference on the 140mm fans in the 5.25 bays



now when I do prime95, I am actually seeing HOTTER temps with the optional top 200mm fan in place (mounted as exhaust)....I thought I was crazy so I quickly did back to back testing without any variations in ambient.....nope, I was getting hotter temps with the optional fan there....

Is anyone else experiencing similar results? Is it because I have 140mm intake fans where the 5.25 bays are? Maybe the optional 200mm fan on top is sucking away some of the cold air from the 140mm fans I mounted in the front?

Let me know....thanks!
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post #2 of 62
2/15/11 at 3:15am
because of the "heat rises" principle, I would exhaust the top and upper rear fans. I have no idea why your getting hotter with that many fans.
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post #3 of 62
2/15/11 at 3:24am
Quote:
Originally Posted by t0adphr0g View Post
because of the "heat rises" principle, I would exhaust the top and upper rear fans. I have no idea why your getting hotter with that many fans.
The fans may be creating an air pocket by blowing the air in different directions. If the air doesnt have a clear path from entry to exit it can get stuck in the case and continue to heat up.
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post #4 of 62
2/15/11 at 3:35am
Maybe the hot air from the graphics card is drawn into the intake of the CPU cooler. Without the front top intake fan, the hot air from the GPU is drawn towards the exhaust side of the CPU cooler.
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post #5 of 62
2/15/11 at 4:44pm
Thread Starter 
Quote:
Originally Posted by Riou View Post
Maybe the hot air from the graphics card is drawn into the intake of the CPU cooler. Without the front top intake fan, the hot air from the GPU is drawn towards the exhaust side of the CPU cooler.
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?
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post #6 of 62
2/15/11 at 4:46pm
Thread Starter 
Quote:
Originally Posted by t0adphr0g View Post
because of the "heat rises" principle, I would exhaust the top and upper rear fans. I have no idea why your getting hotter with that many fans.
my top fans are exhaust fans....i'm not sure if you read my first post?
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post #7 of 62
2/15/11 at 4:48pm
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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post #8 of 62
2/15/11 at 4:52pm
Thread Starter 
Quote:
Originally Posted by Siegfried262 View Post
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.
yes, thats what i was thinking too....i am sure others with haf x's have done a similar mod to their case....i was wondering what inputs they can give me
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post #9 of 62
2/15/11 at 4:57pm
One thing you might want to try if you have spare time. Is turning off your first big top fan, blocking that port, and reversing that second top fan to intake.

Sounds crazy but a couple of users (Ehume comes to mind) have tried similar concepts with other cases and experienced a decent drop in temperatures. I think the idea with that is the top fan above the heatsink exhausts soome of the air before it can travel completely through the heatsinks and by having a second top fan intaking with the first top fan blocked off (so you're not pulling hot air that rises naturally) you're providing fresh air for your heatsink that travels all the way through and out the rear exhaust.

Just an idea if you have the time to spare, obviously results may vary between cases and situations.
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post #10 of 62
2/15/11 at 5:01pm
Quote:
Originally Posted by Siegfried262 View Post
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.
It's much like the ATCS 840 case in that regard which I also have (what a beast - lol!) and by my research people who have these are saying much the same as the OP with his HAF X case.

It's probably better to disconnect the 200mm fan closest to the 5.25" bays to get more positive front to back airflow.
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