Slower Fans=Cooler?

Aastii

Aastii

VIP Member
I got my new heatsink this morning and not surprisingly, my temps dropped, about 15 degrees idle from stock cooling :eek: so i set my OC a bit higher, on 3.4 now :D . But because the fans are now really noisy i dropped then a little with speedfan, down to 85% and it makes my system cooler by about 3/4 degrees compared to idle. Why would that be when faster fans would mean more air flow?
 
Perhaps the fan itself was generating some heat. But 3/4 of a degree isn't much, and could be contributed just to an inaccurate reading.
 
Ah, ok, a bit more significant.

Another theory would be that the increased airflow just caused turbulence, and decreasing the fan speed allowed the air to flow more smoothly. I have seen cases where adding a fan to a case increases temperatures because it's pointed in the wrong direction, causing conflicting air flow.
 
PohTayToez said:
Ah, ok, a bit more significant.

Another theory would be that the increased airflow just caused turbulence, and decreasing the fan speed allowed the air to flow more smoothly. I have seen cases where adding a fan to a case increases temperatures because it's pointed in the wrong direction, causing conflicting air flow.
Click to expand...

I thought that through, i have it so the back fan is sucking air onto the CPU fan, the fan on the side of my case is sucking air away from the exhaust and the fan on top i am playing with at the minute, seeing if changing the direction will affect the temps, but that isn't changed by speed fan because it is molex adapter, not mobo 3 pin

Lets see some pics of the new heatsink
Click to expand...

Give me a few mins, finish up my CoD match and i will get to it
 
okey dokey, my system with new (rather large :P) heatsink









say NOTHING about the wire orginisation (or lack of :P) either, you try fitting an 850W ATX PSU in a mid ATX case. Even with ALOT of cable ties it is still overwhelming half of my case
 
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Aastii said:
okey dokey, my system with new (rather large :P) heatsink







Click to expand...

Is that side panel fan an intake or exhaust? If its intake it could be causing turbulence in the fan, or better yet would be to put it at the rear or front of the case... Is the heatsinks fan blowing towards the front or rear of the case?It looks to be blowing towards the front, and if it is i can see right now a major conflicting airflow, that heatsink is on backwards, its trying to flow towards the front of the case while that rear exhaust fan is trying to suck air out. Plus adding case fans to the front as intake, and replacing that 80mm with a 92 or 120mm at the rear as exhaust could help your temps and airflow a bit also. IMO though, id move the side fan there to the front, and flip the heatsink to create a nice front to rear airflow.
 
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bomberboysk said:
Is that side panel fan an intake or exhaust? If its intake it could be causing turbulence in the fan, or better yet would be to put it at the rear or front of the case... Is the heatsinks fan blowing towards the front or rear of the case?It looks to be blowing towards the front, and if it is i can see right now a major conflicting airflow, that heatsink is on backwards, its trying to flow towards the front of the case while that rear exhaust fan is trying to suck air out. Plus adding case fans to the front as intake, and replacing that 80mm with a 92 or 120mm at the rear as exhaust could help your temps and airflow a bit also. IMO though, id move the side fan there to the front, and flip the heatsink to create a nice front to rear airflow.
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the rear fan is sucking in, onto the CPU heatsink fan, both the rear and CPU fan are sucking towards the front of the case

The 2 on the side are sucking out. The one next to the PCU is sucking hot air from the exhaust, the 120mm is sucking from the nb and GPU
 
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Aastii said:
the rear fan is sucking in, onto the CPU heatsink fan

The 2 on the side are sucking out. The one next to the PCU is sucking hot air from the exhaust, the 120mm is sucking from the nb and GPU
Click to expand...

Your airflow seems to be the reverse of what most would do, as see the psu fan exhausting and removing the cool air from the rear intake, that there is creating a turbulent airflow also. From my experience front to rear airflow with positive pressure is usually the best. Id flip the heatsink, rear fan, and try to get a fan or two in the front and see how your temps change then.

BTW- Nice ubuntu sticker, i have a few on my notebooks:P
 
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I am not entirely sure a full move around is necessary. I mean, it is at 41 idle, around 50 when gaming and that is with a higher OC than i had before, i'm on 3.4 now. I may see what, a 2 or 3 degree drop from a massive move around and that will be with all fans on full, it isn't hurting right now to have it a bit quieter and still cool
 
That was quick shipping...I mailed it Monday at about noon. 3 days from Germany to UK...not too bad considering there was only one shipping option.

Glad it works for you and you like it.

Like I said...I saw a guy who put a high CFM aftermarket 92mm fan on that thing and taped up the sides...it performed as well as some high end coolers.

****EDIT****

You do need to make that a Saturday project....get the fans set up right and cable management under control:p
 
ScOuT said:
That was quick shipping...I mailed it Monday at about noon. 3 days from Germany to UK...not too bad considering there was only one shipping option.

Glad it works for you and you like it.

Like I said...I saw a guy who put a high CFM aftermarket 92mm fan on that thing and taped up the sides...it performed as well as some high end coolers.

****EDIT****

You do need to make that a Saturday project....get the fans set up right and cable management under control:p
Click to expand...

i will end up doing it when i next do a big clean out, thermal paste reaplication etc, but it is all happy and working for now, so when it comes round to it i will get it done. I am dreading the thought now though, if you could see the state of my hands now though after getting the bast*rd thing in you would see why. All of the clips are under the fan or the exhaust so it is so hard to get it in

I have scratches from the bottom of my mobo solders, i stabbed my finger with a knife (and i mean full on stab :P) getting the cable tie that you put on the wire off, scraped skin off of my fingers when my mobo tray decided to jump out suddenly when i pushed it and it decided to be stiff and i have bruised one of my thumbs, how, i don't know
 
Aastii said:
I have scratches from the bottom of my mobo solders, i stabbed my finger with a knife (and i mean full on stab :P) getting the cable tie that you put on the wire off, scraped skin off of my fingers when my mobo tray decided to jump out suddenly when i pushed it and it decided to be stiff and i have bruised one of my thumbs, how, i don't know
Click to expand...

Damn...didn't mean to hurt you:o

Hey, look at the bright side, it works and temps are good:D
 
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