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Passive cooling in FX 8120

post #1 of 14
Thread Starter 
Hi All,
I want to make my system silent and for that I am trying to find replacement for my stock CPU fan. I want to use passive cooling for my CPU but it appears that due to 125W requirement of processor most coolers require additional fan to support which kind of defeats the purpose.

Few I found (but requires additional fans) are
NoFan CR-95C
ZALMAN FX100
SILVERSTONE HE02

To give better idea about usage, I use this machine for both work and gaming. I have not overclocked it but in future I am thinking to do so. And it looks like that idle CPU temp is @ 40C and during high usage like gaming it reaches about 58C.
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post #2 of 14
The silverstone seems the best one out of those three, not nickle plated copper fins, which is unfortunate, but it has 6 pipes on each side, instead of 2 on the NoFan. and the Zelman just looks like it has too many hotspots, and big bulky corners, plus only has 4 pipes.
post #3 of 14
No way dude. FX 8120 draws waaaay too much power to be passively cooled. Maybe a mobile dual core IB CPU but definitely not a Bulldozer. Even still, these passive coolers rely on incidental airflow to dissipate the heat. If you don't have that forced convection from fans, you're relying on natural convection and radiant heat transfer which requires HUGE surface area coolers. That 125+ watts of heat generated has to go somewhere plus additional heat from your other components.

If you want silent, you should consider getting a Phanteks PH-TC14PE or the popular Noctua cooler and then replace the fan with a quieter alternative like the Gentle Typhoon AP-15 that can be undervolted.
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post #4 of 14
Yea, not gonna happen. Maybe downclocked and with 6 of the 8 cores disabled... maybe. I owned one - even a hyper 212+ w/ fan on 100% struggled under gaming at times. thumb.gif
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post #5 of 14
hello,
i'm very everyone else, not possible to cool it with a air cooler in passive, try a closed loop water cooler. will not be much more anyway.
    
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post #6 of 14
Thread Starter 
Thank you all for your replies...
While waiting hear about experience of fellow OCN members, I did bit research too .. and as everyone suggesting here ... it looks like that due to very high power rating of processor it is very difficult to achieve fan less cooling for FX 8120.
I think that stock fan is way too loud and I need to reduce the noise. So I think I will probably hunt for other options. I don't think I will go with water cooling because I don't want to take chances with coolant leaking on my mobo or other places.
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post #7 of 14
It's not the rating of the processor that is disastrous ... the FX8120 is way, way more power hungry than the label suggests. That's what Piledriver is for, fixes BD's power hungry problem and increases the IPC as well
You could passively cool a PD but not a 8120 ... It's even far more power hungry than a 3960X (8150 at least)
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post #8 of 14
Even Piledriver is BRUTAL on electricity when overclocking...

With the current manufacturing process, bulldozer architecture is just so insanely inefficient.
 
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post #9 of 14
Quote:
Originally Posted by nakano2k1 View Post

Even Piledriver is BRUTAL on electricity when overclocking...

With the current manufacturing process, bulldozer architecture is just so insanely inefficient.
PD is not THAT brutal, it's just brutal compared to IVB. It's alot more efficient than BD is and draws WAY LESS.
Just for comparison PD draws a awful lot less than 3960x.
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post #10 of 14
if you downclock it to about 2ghz it might be possible
silverstone one looks like its the best option
no fan one looks like it will block pci-e slots

why do you need to run it passively?
getting extremely low rpm fans like this 800rpm gentle typhoon
http://www.amazon.co.uk/Scythe-Case-Gentle-Typhoon-D1225C12B2AP-12/dp/B001CSBWF6
will be inaudiable
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