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Thread: CPU cooler efficiency




  1. #1
    Join Date
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    Default CPU cooler efficiency

    Does the orientation of a heat pipe based CPU cooler have any bearing on its efficiency?

    The reason I ask, heat pipes contain a liquid and liquids tend to drain to the lowest point. So if a heat pipe CPU cooler is turned on its side as in a vertical or tower installation, what is preventing the liquid in the heat pipes from draining to the end of the pipes?

    I have a Scythe Kama Angle CPU cooler. The pipes in this cooler are U shaped and four of the ends will be well above the heat source and four will be below the CPU heat spreader.

    I am curious. I have an Intel i7-920 and the idle temperatures according to core-temp are 40C, 35C, 42C and 36C. These idle temperatures are higher than what I have read in the reviews of i7-920 CPUs.
    Gigabyte EasyTuner shows a single temperature of 36C.

  2. #2
    Join Date
    May 2009
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    22

    Default Re: CPU cooler efficiency

    Those temps seem fine, a big part of temps comes down to the ambient temp. so take review temps like a gran of salt, a good indication but not concrete.

    Also alot will come down to the cooler you are using, also the fan on that cooler, all of these are variables.

    Load temps are really what matters anyway.

    the orientation of the cooler will make a difference, but only 2-4 degs AFAIK.

    Baldman

  3. #3
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    Default Re: CPU cooler efficiency

    Cooler orientation won't make much difference. Pressure and convection in the heatpipes will cause the heat carried away to be pretty uniform. It is fine to have it in an upright tower case.

    As for orientation of the two "sides" of fins on the Kama Angke, the corner should point upward toward the rear case fan and the PSU/top extraction fan. That way, one side of fins is directly infront of the rear extraction, and the other is right next to the PSU intake or roof exhaust, giving a slight push-pull action.
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  4. #4

    Default Re: CPU cooler efficiency

    Actually due to the layout of the i7 chips, laying the heatpipes across the cores results in better results, between 2-6C as mentioned before. The heatpipes should be lay horizontally across your CPU, not vertically. Since you have the Scythe Kama Angle, however, your heatpipes do not lay directly across the base of the cooler, so it may not matter as much for you. I have a TRUE cooler though, and it matters for me.

    Check out this X-bit article that talks about it: Prolimatech Megahalems and 12 Other Coolers for Intel Core i7 Overclocking (page 7) - X-bit labs

    A quote from the article:
    Just like Prolimatech Megahalems, both Ultra-120 eXtreme coolers proved more efficient when they were installed with the heatpipes going across the processor heat-spreader.
    i7 920 C0/C1 3841A
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  5. #5
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    Default Re: CPU cooler efficiency

    By cooler orientation I believe the OP was refering to having the tower clloer either with its base parallel to the floor, or parallel to the side of the case in a tower system.

    I wasn't aware that heatpipe orientation made a difference on the i7, but I don't have an i7 to test. Seems no reason why it wouldn't be true.

    The Kama Angle does indeed have a non conformist heat pipe lay oout so it as you say might not make much difference on heatpipe contact with the IHS.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

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