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  1. #1
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    HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Hey guys,

    I recently decided that I was going to invest in a 120mm fan, to reduce the noise in my system. I was lucky and found a fan, the Aerocool Xtreme Turbine, that pushes 89CFM, and is quieter than my Smart Fan II that came with my TT Volcano 9. However, when I got everything setup, and connected to the HSF using an 80mm to 120mm adapter, it seems though that the temps for my AMD Athlon XP 2000+ are higher idle than they were normally. I seemed to idle at a high 40's, and while gaming it went as high as 54c.

    This is not normal compared to what I had when I was running the Smartfan2. I know that the Athlon XP's do tend to run hot, which is understandable... but how hot can they run to the point where I need to worry? Furthermore, Motherboard Monitor 5 displays temps for a CPU Diode, and CPU Socket... socket always being warmer... what one should I be concerned with?

  2. #2
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Well, If you are running a Volcano 9 I assume you have a Socket A CPU. Their drop dead temperature was very high and I don't believe you are getting close to to it.

    It had been a while since I ran a Socket A and can't remember what the max temperature is. Seems like it was up around 70C.
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  3. #3
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    If you check here it says that Athlon XPs up to a 2100+ can handle up to 90C, so don't worry about that.

    But what I'm worried about is the fact that as you say "New Larger Fan, Greater CFM, but higher temps? How!" Did you remove the whole HSF to put in the new fan? or just screw on the 80-120mm adapter while still attached to the CPU? If you did remove it, did you reapply thermal grease? It the HSF seated properly? Is the fan spinning fast enough? While the temperatures you are getting are not a worry, you should be expecting better performance from an upgrade.

    One last thing, I have done this mod as well (adding a 120mm fan to a 80mm HSF), and I didn't notice much of an improvement, but I know why. My case is very small so the addition of a 120mm fan and adapter hindered airflow greatly through my case, so my case as a whole heated up, and I end up pushing warm air over my CPU. Maybe something to think about.

  4. #4
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Another possibility is the back-pressure created by trying to adapt the 120 to the 80.
    IIRC I tried this with a 92mm on a SLK-900 and ended up going back to an 80mm smart-fan that was adjustable and turning the fan speed down, trying to find the balance between noise and cooling. (oc'ed 2000xp)

  5. #5
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    I agree with you Donut, I have the same fan on a 120 mm heatsink and it performs very well.
    I suspected it as soon as I had the title. Your small fan had less max CFM but better flow with the back pressure that results from the adapter. The air is being pushed into a hole less than half the 120mm hole.


    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
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  6. #6
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Sounds improvement to me is a big deal. Should I consider this a loss of $30, since I'm not getting as great performance out of the computer as I was with the 80mm? Or should I be happy that while I'm not seeing any better performance from cooling, at least I now have a slightly quieter PC?

    Would a slower CFM 120mm (Quieter) make much of a difference at this point? Not to aid cooling, but would the 89CFM work about as well as a 39CFM fan in this case?

    I didn't remove the whole HSF, so no need to reapply the thermal grease. I removed the fan, added the adapter, and then put on the fan.

  7. #7
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Another thing to consider is if the manufacturer of the fan is lying about the CFM rating. Reviews on Newegg for that brand of fan aren't so hot. I have a 14 CM fan of that brand and it certainly doesn't feel like it is pushing the amount of air it says it does.

    You could try opening the side of your case to see if that helps temperatures.

    Athlon XPs should have a built-in shut-down feature if the CPU gets too close to its critical temperature. I remember mine did. I think it shuts down around 180F.

  8. #8
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Well my case temp has always been fine, that was never an issue. I seem to feel a lot of air coming from the sides of the heat sink, which makes sense. One thing I noted the other day though is that the adapter doesn't cover the heatsink perfectally... imagine like a D near the bottom of the adapter, that hangs over the side. Not ALL of the air is forced onto the heat sink. I don't know if that's potentially causing a problem.

    Fortunately the computer doesn't seem to be going above 55c even while gaming... though in a cool room, I still think that's a decent amount higher than what I normally had gotten.

  9. #9
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    I have read in the past about these 120mm to 80mm adapters not being all that effective. Been a while, but I think it was because of the backpressure as some have already stated.

    Personally, I would probably go back to the 80mm fan and be done with it. Otherwise go with a sp-97 or slk-947u solution (that is if you can still find one) with a 90mm fan if you really want to spend money to cool temps down, but I don't think you really need to. For a socket A solution those 2 hsf are very cool cucumbers.

    I used to have a volcano 9 and have never been impressed with it. I really didn't like the smart fan 1 or 2.. found them way too loud for the cfm they provided.
    Rig 1: Asrock 939Dual-SATA2, X2 4800 @ 235x12, 1.40v, TRUE 120, 4X1 Gb OCZ Platinum Rev2, Evga 7950, M-Audio 2496, CM690, Corsair TX750, Win7 RC 64 bit
    Rig 2: DFI UT NF4 SLI-DR Expert, X2 4800 @ 12x240, 1.46v, Ultima 90, 4X1 Gb OCZ Platinum Rev2, 2x8800GT SLI, P160W, TX750w, Audigy 2ZS, WinXP pro
    Rig 3: Asus A7N8X-Dlx v2.0 Barton 2500(AQXEA 0319) @2200mhz, Silent boost, OCZ (2-3-3-6-1T) 2x512mb, 9800Pro, P160, HE Neo550, Raid-1, Win2K
    Rig 4: Asus A7V880, 2600M (200x12.5), SP-97, Panaflo HS, OCZ 2x1gb Plat.rev.2, BFG 6800 OC, AC Silencer, Antec 902, TC550W, Pioneer 110, WinXP pro
    Rig 5: DFI RDX200 Opty 148 @250x11, AC Freezer Pro, TCCD 2x512, X1650Pro, Sonata II, Nexus NXP 201, GameXstream 700W, Win2K.
    Rig 6: Gigabyte EP45-UD3P E8400 @ 500x8.5, TRUE120, 4x2gb Buffalo FireStix 8500, x1650 Pro, CM Scout, Everest 1010W, Win7 RC 64bit
    Rig 7: Gigabyte EP45-UD3P E8400 @445x9, TRUE 120, 4x2gb GSkill 8500, Visiontek 3870, Corsair TX850, Antec 900, WinXP64

  10. #10
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Forgive what might be an obvious question.....is your fan blowing air in the same direction as it was before? Flipping it upside down on top of the adapter would be a fairly easy mistake to make.

  11. #11
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Lolo.... wouldn't that be a hoot
    Rig 1: Asrock 939Dual-SATA2, X2 4800 @ 235x12, 1.40v, TRUE 120, 4X1 Gb OCZ Platinum Rev2, Evga 7950, M-Audio 2496, CM690, Corsair TX750, Win7 RC 64 bit
    Rig 2: DFI UT NF4 SLI-DR Expert, X2 4800 @ 12x240, 1.46v, Ultima 90, 4X1 Gb OCZ Platinum Rev2, 2x8800GT SLI, P160W, TX750w, Audigy 2ZS, WinXP pro
    Rig 3: Asus A7N8X-Dlx v2.0 Barton 2500(AQXEA 0319) @2200mhz, Silent boost, OCZ (2-3-3-6-1T) 2x512mb, 9800Pro, P160, HE Neo550, Raid-1, Win2K
    Rig 4: Asus A7V880, 2600M (200x12.5), SP-97, Panaflo HS, OCZ 2x1gb Plat.rev.2, BFG 6800 OC, AC Silencer, Antec 902, TC550W, Pioneer 110, WinXP pro
    Rig 5: DFI RDX200 Opty 148 @250x11, AC Freezer Pro, TCCD 2x512, X1650Pro, Sonata II, Nexus NXP 201, GameXstream 700W, Win2K.
    Rig 6: Gigabyte EP45-UD3P E8400 @ 500x8.5, TRUE120, 4x2gb Buffalo FireStix 8500, x1650 Pro, CM Scout, Everest 1010W, Win7 RC 64bit
    Rig 7: Gigabyte EP45-UD3P E8400 @445x9, TRUE 120, 4x2gb GSkill 8500, Visiontek 3870, Corsair TX850, Antec 900, WinXP64

  12. #12
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    No, I'm positive that it's blowing air in the same direction, that was never a fear of mine. Both fans were blowing air onto the processor, not drawing air away from it. I think I'm just going to stick with the fan for now and see how well that works out, I'm really enjoying it being a lot quieter.

    Are there any 80mm fans that have good CFM, but are a lot quieter than the Smartfan's? Because I'd be willing to look into that as a change too.

    Thanks!

  13. #13
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    Re: HSF: New Larger Fan, Greater CFM, but higher temps? How! AMD XP 2000+

    Not really, greater cfm equals more noise. You can use a fan controller to find the best balance though.


    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

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