CPU FAN RPM????? how fast should it be?....
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Thread: CPU FAN RPM????? how fast should it be?....

  1. #1
    Join Date
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    CPU FAN RPM????? how fast should it be?....

    hey guys,
    Using my thunderbird now and i just noticed today that the CPU fan RPM was at 4070!!! my old coppermine used to be at around 4900. Is this just the way the fan is desoigned? my temps hit about 43 under load, and its been like this since i got it. When i enable the CPU Fan RPM earning, it goes off and says rotation is low. Is this just a slow fan? it still cools fin, and I know this because my CPU right now is 38. Any info would be great. Thanx
    jay

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  2. #2
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    4000K RPM is relatively slow for a CPU fan but it could be a Quiet/low CFMs model. As long as your CPU is cool enough, don't worry about it.

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  3. #3
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    It all depends on the fan.

    The fan on my ChromeOrb spins at about 5700rpm but then again its a very small fan. Bigger fans will proabably spin slower.

    Try oiling the mechanism, cleaning off the dust, or polishing the blades. All fans gets slightly slower over time with dust etc

    [This message has been edited by davidstone28 (edited 02-09-2001).]
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  4. #4
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    Or a FOP38....7,000 RPM.

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    Scott
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  5. #5
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    My FOP 38 runs at 7600 RPM!

  6. #6
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    I don't have any fans with speed sensors, but I have noticed that I get different voltage readings with different motherboards. The +12volt reading in bios is a bit higher with my abit kt7 (kt133 chipset) than it was with my old celeron system.

    The more voltage you give a fan the faster it will spin.



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  7. #7
    Justintime Guest
    my fans are 7250 on my cpu and 4000 for my case fan, i can't measure the blow fan cause it ain't got monitoring. I modded my case at the side, to fit 2 extra fans, by cuting holes, Works wonders!temps on cpu dropped to 20's to low 30'sfrom about 35-7c with fop38

    ------------------
    Jr

    [This message has been edited by Justintime (edited 02-11-2001).]

  8. #8
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    One thing I have noticed. Of the three YS-Tech fans I have used (60x60x25mm 26CFM that is used on the FOP32-1). They are rated for 4200 RPM, but they all ran at 4700-4900 RPM. Does that mean mine, at 4900, is running 30CFM instead of 26? or ar the fins creating a little less drage and less airflow, so the fan can run faster (resulting in 26CFM again)?

    Intel_DuDe:
    Is this the same fan you had on you Inel system or a new fan. If it was the same fan, then I would be worried the fan might be crapping out on you (it would likely be noisier too).

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  9. #9
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    Important, listen up:

    I have a 140 hp outboard on my boat. Wide open it was running at 5000 rpm. Then I put a prop with a different pitch on it to make it go faster. The rpm's dropped to 4600. I told my boat guru to tweak the carbs or do whatever to get it to rev to 5000 rpm's again so I could really wail ! He explained this to me:

    When the butterfly's are fully open, that is as fast as the motor will run, the speed of the motor is actually controlled by the pitch of the prop !

    OK, take two identical cpu fans and supply them with the same voltage. If the pitch is even slightly different, rpm's will change.

    Also voltage variables from board to board could alter the speed, as well as dirt and crap stuck to the blades.



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  10. #10
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    Todd,
    No, this is a different fan from the one which i used on my Cumine. It came with it stock when I bought it, and has always spun that fast. No dirt or crap in it either. ANd it is also VERY quiet, which tells me it may be a low cfm fan. My temps are fairly low, from about 28-38 Celcius.
    thanx guys
    jay

    ------------------
    -T-Bird 850 (100fsb DDR x 8.5)
    -DFI AK74 SC w/ VIA KT133 chipset.
    -128Mb PC-133 Cas 2
    -Asus V7700 G-string 2 GTS 200/337
    -Fijitsu 10.2 gig @ 5400rpm
    -SB Live! PC 128
    -Delta 52x CD-Rom
    -Iomega ZIPCD 650 4x4x24 CDRW
    -Sony CPD-E 100 Trinitron Flat Screen
    Athlon 64 3000+ @ 2.25GHz | Asus K8V SE Deluxe | 1GB PC-3200 Kingston DDR | ATI Radeon X1600 256MB | 200GB Seagate Barracuda SATA | 40GB Western Digital External | Sound Blaster 5.1 with
    Inspire 5300s | Pioneer 106s 16x DVD | LG 16x Super Multi DVD-Writer Dual | Intel Gigabit LAN | Enermax 300Watt | 20.1" Viewsonic LCD 1600x1200 | Windows XP Pro SP2

    My 1987 Ford Ranger

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