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New heatsink installed - need fan suggestions.

post #1 of 9
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I have never actually looked much into fans for high pressure but then I've been used to using high CFM 80mm fans which usually provided high pressure to begin with. Now with the move to a 120mm fan and the stock fan used, I'm considering looking into a different fan for the task. Currently with the stock fan at max, the heatsink fins still remain warm when I would otherwise expect them to be cool from the airflow cooling it off. So from my experience if the fins on a CPU heatsink is warm it simply isn't getting enough airflow to keep up.

So.. I modded up my case to be able to slide the motherboard in with the Enzotech Extreme-X mounted down (tight fit with the slide) and then putting the fan in on top. Earlier I had the fan mounted on the bottom pushing up and then tried the fan on top mounted up (pulling air from bottom). With the bottom mounted fan it's easier to pull the board without fan removal but it feels a bit more strained for intake due to the slightly more cramped area.

The only issue is the stock fan I have don't seem to have enough pressure to really pull and force the air through the heatsink.

I do apologize for the poor pictures but it's a rather cruddy camera and all I have. This is the setup with the sink in it:


You'll see why I have the fan flowing air from the heatsink upward due to the airflow coming from the front at the lower left of the case based on image 1 (but isn't shown). Taking the case sides off didn't make any difference in temps so feel the fan just isn't sufficient for the task.

I was doing a brief search and from some reviews the [ Corsair SP120 Performance ] seems a good choice but surely you guys would know of something more suitable for the task? I'm up for push-pull suggestions as an idea too for this sink. I tried it with another fan added, made a 1c diff butother fan was horribly mismatched and low performance. I don't care about the noise levels at all and I'm interested in the best flow for the task as the case seems to keep much of the noise in without issue.

The current stock fan it has is an [ ADDA 120mm AD1212UB-A73GL ]

Edited by Chozo4 - 1/5/14 at 4:58pm
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post #2 of 9
Are you sure you need a better fan? What kind of temperatures are you seeing?

Here is a link to some 120mm PWM fan tests
http://www.anandtech.com/show/6391/120mm-radiator-fan-roundup-part-2-fan-harder/6
Edited by Fan o' water - 1/5/14 at 5:10pm
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by Fan o' water View Post

Are you sure you need a better fan? What kind of temperatures are you seeing?

Here is a link to some 120mm PWM fan tests
http://www.anandtech.com/show/6391/120mm-radiator-fan-roundup-part-2-fan-harder/6


Considering it was a warm day today (30c or so in my bedroom compared ot the usual 24-25c) the CPU was hitting around 55c when I was pushing the processor a bit more on this heatsink to about 3.9ghz. Granted, the AS5 has yet to set in though so that's affecting it by 1-2c surely. I was feeling for the airflow from the heatsink and it wasn't all that obvious as it could barely be felt pulling through the sink (or pushing through when mounted on the underside).

I really cannot find much for specs on this fan other than the CFM and not the static pressure. Yet if I can barely feel much pull from the fan I would think it isn't doing it's job all that great. I know such heatsinks are made for top-down flow but A tower sink cannot be used due to the space and top-down flow causes even higher temps due to fighting the airflow so have to use bottom-up flow to get the airflow proper.

As for the list, that's the one I noted the SP120 being a good choice, but looking for specs on the stock h80 fan right now to see if I can source one for the task. Perhaps there would be something better but not recommended due to the noise, such as a Delta FFB1212EH-PWM (150CFM/11.3 mmH2O?) or a Delta PFB1212UHE-F00 (252.85 CFM/35.9 mm H²O)? The idea is to force the air through with enough pressure to pull plenty of air from across the motherboard as well to compensate for not blowing onto the board itself.

Edited by Chozo4 - 1/5/14 at 5:57pm
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post #4 of 9
Thread Starter 
Ended up buying a pair of Delta FFB1212EH-F00 (the non-PWM variant) off EBay for $10 each which after discounts came out to $14 total so will see how they work out. I feel it might be best with my setup to have one as the push from bottom of sink and the other for the exhaust rather than a push/pull on the sink itself. Surely they are overkill but the noise is pretty well muffled in this case. Considering the current they pull I'll simply run them off my PWM->Voltage fan control to keep them variable.
Edited by Chozo4 - 1/6/14 at 10:29am
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post #5 of 9
At 1.45amp you should only hook them directly to PSU for power. That's more power than motherboard fan headers are rated for... and not many fan controllers will handle 17.5watt.

Oh!.. Don't forget to wear ear protection! thumb.gif
post #6 of 9
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Quote:
Originally Posted by doyll View Post

At 1.45amp you should only hook them directly to PSU for power. That's more power than motherboard fan headers are rated for... and not many fan controllers will handle 17.5watt.

Oh!.. Don't forget to wear ear protection! thumb.gif
Ear protection such as these? biggrin.gif


I'm most definitely aware of the current needed and wouldn't use on the fan header at all as no documentation=assume 1A MAX. They will instead be going on a sunbeam Rheosmart PL-RS-3 which are rated 2.5A/30watt per channel, powered by the PSU 12v rail, and auto controlled via a single wire to the motherboards fan header for PWM Input. It has also had the caps refitted with Rubycon 16v 1000uf YK caps in place of the HongShen(?) 25v 470uf caps on it since it only carries 12v across the caps and I don't trust caps made from china. I had a bit of a laugh on this topic last night really as I'd gone through some of the reviews on the fans over on NewEgg. Came across several poor ratings are by people who claimed it burnt out their fan controllers such as the Sentry 2 which are only 10watt(~0.83A) per channel yet they wonder why they had such troubles! doh.gif

If they are a bit more noisy than my case can contain then I'll put the couple packages of noise isolating foam from AKUST I have sitting around unopened into use. My last heatsink was using an 80mm AVC DS08025R12-011 @ 0.7A which was pretty noisy as it is but rather quiet when the case was closed up. An 8db increase with the delta's should be more than bearable considering with what I was using and tolerant of at max speed. It would be a completely different story if I used them for intakes though.. weirdsmiley.gif

Will update when I get them and find out the results overall.

Edited by Chozo4 - 1/6/14 at 12:23pm
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post #7 of 9
Thread Starter 
Well, got them in and they are pretty loud but bearable long as they aren't at max. I was mainly seeking high pressure and they do the job well even when at lower speeds. They also proved that while they help with the temps in a lot of areas (VRM sinks are now cool to the touch at max load for example) that it seems this enzotech heatsink isn't all that great either and I've mixed thoughts on it as I'm really not seeing any temp difference between this with the deltas and my last stock 4 Heatpipe AM2 Heatsink that I lapped long ago. May try remounting this week to see if it helps. Never used bolt down heatsinks before but made it as finger tight as possible on all 4 bolts as I can with a very thin spread of AS5 in between. Overall I'm slightly disappointed it doesn't hold up as well as I was hoping in comparison to my last.

On a side note, after some brief testing - the fan headers seem to be taking the fans like a trooper on voltage speed control. Most I will be running the one on the fan header at 60-75% anyway so will be within the 1AMP guideline. They seem to drop down to about 3volts before stall so they run quiet enough under idle and low-load conditions.

These Delta's I got are marked 4K17 rather than F00 despite being 3 wire. They also have a very slight vibration which gets a tad annoying at max speed so thinking they might have been very slightly off balance either from shipping or otherwise...mad.gif


Edited by Chozo4 - 1/9/14 at 1:49am
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post #8 of 9
Start-up is when the fans pull the most power.. often even more than their spec says. wink.gif
post #9 of 9
Thread Starter 
Quote:
Originally Posted by doyll View Post

Start-up is when the fans pull the most power.. often even more than their spec says. wink.gif
You know.. I'd definitely brain-farted about that one and completely forgotten about the startup current despite mentioning it in another thread not long ago redface.gif I've considered modifying the use of the header this week by putting either a 1A max current Shottkey Diode inline with the fan or a small 1A linear voltage regulator to limit the startup current from the fan. Sure there will be a small voltage drop but that's not an issue.
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