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I added an intake fan an my temps went UP!

MichaelD

MichaelD

Lifer
I guess this means that I should've added an exhaust fan, not an intake fan?

I have an Antec 1040 clone case. It has provisions for two intake and two exhaust fans.

My setup WAS:

1. My PS has the two fans and it acts as an exhaust fan.
2. I have a single exhaust fan in the upper bay and I have duct tape over the lower bay (forces the exhaust fan to pull air front front, not thru open hole in back)
3. Single intake fan up front, lower bay

Running P95, my temps were 48-49C CPU and 34C case.


I added another intake fan, thinking "more cold air in, better cooling"

Running P95, my CPU temps shot right up to 50-51C. Case temp is the same 34C.

What gives here? Should I move that second intake fan to the back and have THREE exhaust fans (PS counts as one) and a single intake fan?
 
Take the tape off the second exhaust fan and put it back there where the tape is now. The Antec fans don't move much air (they are quiet tho, I have a 1080awg), and your new fan probably does. You allways want more coming out than in (it will suck what it needs)
 
Originally posted by: Markfw900
Take the tape off the second exhaust fan and put it back there where the tape is now. The Antec fans don't move much air (they are quiet tho, I have a 1080awg), and your new fan probably does. You allways want more coming out than in (it will suck what it needs)
Click to expand...

Thanks Markfw900. I've researched case cooling so much, my head hurts. I remember reading something about "negative pressure" i.e. a vacuum that can result from having too much exhaust vs. not enough intake. Thoughts?
 
You may have run into the situation where adding another device put just enough more load on the P/S to raise the overall internal etmp inside the case. It is better to exhaust air by force and let fresh air come in by demand. The exception is a fan in the drive cage to cool the HDDs - another big source of ambient heat. These are your big heat producers:

1. CPU
2. Memory (A heat spreder cover helps)
3. P/S
4. HDDs
5. Vid Card
 
yea,
force the air out, and let it naturally come in.
but remember, natural air flow always moves hotter particles upwards.
you'll have to choose air intake holes lower than exhaust (that's why most psu is in uppermost position)
 
Originally posted by: corky-g
You may have run into the situation where adding another device put just enough more load on the P/S to raise the overall internal etmp inside the case. It is better to exhaust air by force and let fresh air come in by demand. The exception is a fan in the drive cage to cool the HDDs - another big source of ambient heat. These are your big heat producers:

1. CPU
2. Memory (A heat spreder cover helps)
3. P/S
4. HDDs
5. Vid Card
Click to expand...

Hey Corky-G, thanks for the reply. I've got plenty of PS Juice (Antec Trupower 430) so I don't think another fan is an overload. 😉 I will move that extra case fan to the second exhaust postition. I wonder if I should leave that single intake fan up front or remove it completely?
 
Originally posted by: MrBond
Over in Cases and Cooling I read saturday where someone was saying an intake fan wasn't really needed, just a good exhaust one. Maybe that's it?
Click to expand...

Generally, IMO, that is exactly right, however there are too many variables like case location for instance, that can sometimes work better with both. In my experience, as long as the case has adequate venting in the front for free air flow, an intake is generally not needed as the exhaust pressure will naturally pull in the air from the front. Sometimes if the CFM's of the intake and exhaust fans are inbalanced too much, it will actually create more turbulence in the case, and reduce airflow. When relying on exhaust fans only, you will have a smoother airflow throughout the case as the air is not being forced in, but flowing in more or less at the same speed as the air is being exhausted.

As long as the case is not tucked into a small space, and has adequate space in front and behind to allow for airflow, the exhaust only approach should work best. With a case like the Antec series, you have plenty of venting in the front of the case so a intake really should not be needed. I would suggest removing the intake fan, and maybe even adding a second exhuast fan if you need a little boost in cooling. Another side benefit to having no front intake is the noise can be cut down more since the fan in the front is heard more than the others inside and in the rear of the case.

🙂


Oh, btw...

IMO. <--disclaimer😉

🙂
 
Thanks, Insane3D. You helped me out big time when I went thru my whole "quiet case" fit a few months ago, and you're still providing excellent "after-the-sale" service. 😀 You'da'man! Thanks. 🙂
 
Originally posted by: MichaelD
Hey Corky-G, thanks for the reply. I've got plenty of PS Juice (Antec Trupower 430) so I don't think another fan is an overload. 😉 I will move that extra case fan to the second exhaust postition. I wonder if I should leave that single intake fan up front or remove it completely?
Click to expand...


I have the same P/S = and adding one more fan up front caused random error beeps - annoying. But they were caused by adding the 2nd fan in front. I removed it - problem solved - no change in case temp. The single intake fan is mounted up front and as low as possiblr in Antec and derivatives such as Thermaltake.

I also replaced the stock CPU/cooler interface (removed the Intel tape) with Arctic Silver 3. After 72 hours, the difference was -3 C.
Click to expand...
 
Yep, AS3 is awesome stuff. I use it on everything, including the Northbridge on my 8RDA+.

I'm going to remove all front intake fans and use two exhaust fans. Should make for a quiet computing experience. I'll report back in this thread what the results are.
 
Originally posted by: MichaelD
Yep, AS3 is awesome stuff. I use it on everything, including the Northbridge on my 8RDA+.

I'm going to remove all front intake fans and use two exhaust fans. Should make for a quiet computing experience. I'll report back in this thread what the results are.
Click to expand...

Michael, if possible, try to match the exhaust fans... 🙂
 
Negative pressure is better (where more air is sucked out than sucked in) as heat inside is not allowed to swirl around. Is the new fan (the one attached as intake) more powerful than the old one?
 
Heheh, a few months back, when I was on my "quiet case" tack, I purchased a dozen (yes, 12) Vantec Stealth 80mm case fans. ALL my case fans are matched. 😎

I am going to run them off the "fan only" outputs on the Antec Trupower PS. It does spin them at a reduced rate, but aahhhhhh, the silence!!! 🙂
 
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