lower rpms = lower temps?

rykoryko new york
edited April 2004 in Hardware
Last night before bed, I went to turn down my 80mm SF2 using Abit's FanEQ thing. At full blast (5000+ rpm) my cpu temp was at 36C. I turned down the fan to about 3700rpm and my cpu dropped to 34C. :thumbsup:

So faster (more cfm) is not better? It seems like everything I thought I knew, I don't. Would a 60mm low rpm fan cool even better?

What is the ideal fan size, rpm, cfm for a slk-948u? My cpu is a p4 2.8 @ 3.2.

Oh yeah and this isn't an april fool's joke to get all of you to turn down your hs fans and melt your cpu's! I just want to know what some other people's temps are with similar systems. Thanks.

Comments

  • profdlpprofdlp The Holy City Of Westlake, Ohio
    edited April 2004
    The key thing is efficiency. I know from working with pumps (a fan could be considered an air pump) that when you run it at too high a speed it can actually slow the rate of water movement. Taken to extremes it can cause an effect known as cavitation where flow drops dangerously low.

    Maybe at the higher speed it was generating turbulence and backpressure, resulting in lower airflow.
  • MJOMJO Denmark New
    edited April 2004
    Well my temp. go up when I turn the RPM down.

    SLK-947U w/ Tt SF2

    EDIT: Forgot the temps.

    CPU idling

    55 degrees @ 3700 RPM

    51 degrees @ 5000 RPM
  • csimoncsimon Acadiana Icrontian
    edited April 2004
    it happens with mine as well ...on the rear exhaust fan. Have you experimented by reversing the air flow?
  • rykoryko new york
    edited April 2004
    I have not experimented with reversing the airflow.

    The reason i haven't is b/c i have 4 hdds at the front of my kingwin kt-404 case, and 2 80mm front intake fans blowing directly on them. If i switch intake/outake, i don't think my hdd's will keep cool.

    But if i get motivated, i will switch it around just for a quick test run. Any body have dramitic results from reversing airflow?
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