The Official OC (OverClocking) Thread! [page 276/451]

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The Official OC (OverClocking) Thread!

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theonejrs

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24. May 2008 @ 04:17

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im1992,

Quote:
Is a 120mm fan at 1162rpm good or is a 80mm fan at 2000rpm be better?

It's not that simple. It's all about how many CFM the fan makes at what RPM! My 80mm Silverstone moves about 25 cfm at 1300 rpm and the 120mm Silverstone moves about 75 cfm at 1400 rpm. Both are capable of much more cfm, but they would be too noisy for most people. Still the 120 is capable of 110 cfm and the 80, 75 cfm. Ideally, you would want the most airflow at the lowest possible speed to keep it quiet as possible and still cool well. Another plus is they com with individual controllers

I like ball bearing fans for their durability and steady running speed. I like and use the Silverstones because they move lots of air at the speeds I run them and at the speeds I run them they are reasonably quiet, don't disturb my sleep and can barely be heard across the room (about 10 ft.) The video card is the loudest fan in the computer! when lying in bed with the computer running I can barely hear them at all (about 6.5" away).

Another direction to go is with some type of sleeve bearing fan, and regardless of what fancy name they give some of the bearings they all pretty much work the same, the heat of friction causes lubricant to render out of the bronze or ceramic bushings to lubricate the shaft. They tend to have more of a change in running speed because of this process, so they do speed up and slow down, but it's not that noticeable. They do get more noisy towards the end of their life! If the lowest amount of noise is your goal, then these type would be best for you. Unless you live in a very dusty environment like I do! Even magnetically sealed sleeve bearing are terrible here as the dust works it way in and ruins the teflon seal on the turning and static surfaces. They don't last very long here either! I think the longest one has lasted is about 6 months, and then they start rattling and screeching when you first start the computer The ones with the Sony S-FDB bearings are the worst, as they are no mach for the fine silt like dust we get all the time around here. It gets into damn near everything! Scythe s-aflex fans are good, but they only have one model I tried personally and it had less cfm at 1600 rpm than the 120mm I have now makes at 1200, moving about the same amount of air!

Don't even consider most of the manufacturer's claims for noise as about 85% or more of those claims are pure BS! Sam is the expert on Silent PCs around here and has probably tested more fans than anybody here. If a silent PC is in your plans, he's the man to talk to!

Good fans generally cost between $15 and $20, but are generally worth it. I don't generally think too much about the warranty, as cheaper fans usually cost more to ship back than the fan cost to begin with. Even some name brands like Thermaltake tend to fudge a bit (a lot on the Thunderblade!) on their noise levels. They claimed 21dBA @2000 rpm for the Thunderblade. I tested one out after feeing that it was making between 33-35 dBA, rather than the claimed 21. I've got a pretty good ear and it tested out at 33.7 dBA in the company I work for's Anechoic Chamber. Pretty good hearing for an old man who'll be 64 in a month! Sam has extraordinary hearing too! That's the main reason he wants as quiet a PC as you can get. Like me, he hears things most people don't. Like me, he's a great music lover, with an ear for good music. I think it's because we both hear things most people miss completely! I know my hearing goes all the way up to 21,700 cycles as of the first of May, and Sam's range must go to the moon! LOL!! as he can hear things even I can't! I know I listen to Eric Clapton and Duane Allman's work on the original "Layla" it's like Nirvana! I hear every frett, every note and every harmonic (SWEET!) Believe me when I say, it's absolute Magic to listen to! I'm so glad I can still hear it all!

marsey99,

Quote:
but sam said he had used as5 so that was why i posted my tip.

Sorry bout that! I completely forgot that Sam switched coolers, I'm just used to the Freezer 7! LOL!!

Best Regards,
Russ


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