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How I dropped ~10c on an i7 2600k @ 5GHz

post #1 of 16
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In my opinion the stock Noctua NH-DH14 doesn't move enough air. ~50 - 70cfm per fan iirc. I have the Coolmaster 922 pushing close to 800cfm total (2x200mm+6x120mm not counting PSU fan). That helps alot...

The real trick was fiddling with the amount of Artic MX-4 (took 5 tries to get that right for about 3C drop) and modding the Noctua did the rest. I removed both Noctua fans. I replaced them with 120mm Silverstone 1900rpm 28db 110cfm fans. But the catch is I didn't do the fans the way Noctua does. I have one fan on the front blowing through the Noctua and one fan on the far side pulling through the noctua. The middle fan was removed and that spot is empty. The two 120mm 85cfm fans on the side of the case line up so that they blow right into the center opening of the Noctua where their center fan used to be. I then made an air baffle out of plastic that forces all of the air going through the Noctua out the back fan opening. Cables are all tied back out of the way so I have straight thru airflow. We are moving a lot of air (if I did my math right all of the air in my room passes through the Coolmaster 922 once every two minutes - room=12x12x10). This resulted in another 6C-7C temp drop.

Prioir to doing this I was getting high 70's and low 80's on Prime95... this combined setup dropped the temps ~10C across the board so I'm hitting the occational 68C on Prime95.

FYI: I've had it up to 104.5 x 55 for 5747.5MHz (1.55v) but I need to fiddle a bit more with the thermal paste (new brand maybe) because it was stablish at that setting but Prime95 hit 89C so I killed it... I don't plan on running it at this higher setting just wanted to see what she'll do...

Here's some pictures... first one is the full setup before I modded the Noctua NH-DH14:



This next one shows the modded Noctua. It has one 120mm Silverstone 1900rpm 28db 110cfm fan you can see on the front pushing and another 120mm Silverstone 1900rpm 28db 110cfm fan attached to the back heatsink that you can't see (it's behind the air duct) and that fan is pulling air. The Air duct is made of thin white plastic from a plastic box my wife had from Target that has since gone missing (please don't tell) The duct not only goes down the side you can see but also under the Noctua all the way to the motherboard where a PCIe mini slot holds it in place. Nothing really earthshattering here and I'm not breaking new ground or going to win any Engineering awards.

You may noticed that there isn't a fan on the back of the case. I found that more air moved through when the was no fan (I used the highly scientific damp hand over outside vent test to detect airflow strength). I think the fan that was there originally (see pic 1 above) churned up too much back pressure so it ended up impeading the "through" flow...



The next picture shows my 120mm 85cfm fan the pulls air from the front of the case thru the meshed, filtered, unoccupied upper drive bays. That air flows directcly to the Noctua set up and also cools the RAM.




This last picture shows how the 120mm 85cfm side fan feeds both the front and back 120mm Silverstone 1900rpm 28db 110cfm fans. The front edge of the fans blows outside air into the front 120mm Silverstone 1900rpm 28db 110cfm fan, the central part of the fan blows down on the top of the front heatsink, and the back edge blows air down the center of the Noctua heatsinks so some hits the heatpipes right above the cpu and the rest get sucked through the heatsinks by the back (pull) 120mm Silverstone 1900rpm 28db 110cfm fan. There is also a 200mm fan on the top of the case venting hot air up and a 200mm fan in the front blowing in cooling the drives.

What you can't see in the pictures is another fan mounted on the side panel below the side fan hitting the Noctua. This second fan blows outside air into the path of the two fans on the GTX 570 and the Silverstone PSU's top input fan. If you look in picture #1 I removed the PCIe slot cover that's circled in red. This helped eliminate some back pressure eddies I had caused by the side fans. If the GTX 570 or the PSU don't suck in all of the air whatever is left flows out that open slot. How did I know there were eddies you ask...? Well I took several 2" x .25" and 3" x .25" pieces of tissue paper that I cut. I taped the dangling down from different spots in the case. When I powered everything on I watched them blow in the wind. I noticed that when the variable speed PSU or the GTX 570 fans would slow down I would have brief times where the tissue blew forward and then back and then forward, etc. So I knew I had vortex eddies of air hitting the back from somewhere so I removed one PCI slot back cover "thingy" and now the tissue always blows out. I'm really moving some air...



None of this is original.. I mean I'm not claiming anything here as unique... I'm sure it's been done better many times here at Overclock.net . I was just posting some pictures since a few folks in the Overclock.net 1GHz Club asked to see what I described in my application over there.
Edited by baj2k - 5/17/11 at 11:40am
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post #2 of 16
hey nice work

10 degrees less in temps is fantastic
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post #3 of 16
Over the summer I am going to do some similar work... cooling a 2600k @ 4.5 with one 5850 running at 70c and the other running at 80c is difficult. My room is like a damn furnace when summer temperatures arise.
post #4 of 16
Quote:
Originally Posted by E-Peen View Post
Over the summer I am going to do some similar work... cooling a 2600k @ 4.5 with 2 5850s running at close to 85c is horrible, my room is like a damn furnace when summer temperatures arise.
i no the feeling

have you ever thought of watercooling ?
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post #5 of 16
I knew Dell engineers weren't wrong when they used the tunnel system to cool down those hellish P4 @3.4Ghz
   
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post #6 of 16
Quote:
Originally Posted by masonkian View Post
i no the feeling

have you ever thought of watercooling ?
Yeah, I would want a bigger case though first. I love my case I just have some really expensive hardware in there and it doesn't help that it's a small case. Heat is a small issue at the moment since that would be easily solved if I had a larger case with more room for fans.
post #7 of 16
I was having a similar issue so I bought Silver Stone FM 123's. At full speed they drop my temps by at least 15c but they're extremely loud so I keep them at medium where they're pretty silent.
    
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post #8 of 16
Hope you don't believe that Silverstone 1900RPM fan really produces 110CFM. Its more likely less than half that.
post #9 of 16
Nice work and good explained!
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post #10 of 16
Thread Starter 
Quote:
Originally Posted by Willhemmens View Post
Hope you don't believe that Silverstone 1900RPM fan really produces 110CFM. Its more likely less than half that.
and yes, you're probably right... there is a cloud attached to every silver lining...

Seriously though... they move alot more air than the stock ones... I only put the CFM as a reference in case anyone wants to try something similar. Although I don't think they make this fan anymore...

Noise... according to the Interweb 28db is about the same as a a whisper from 2 feet away... for a 10c drop definitely worth it...
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My65GTO
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