1. #2901
    The SP120 are not PWM, if you want to control their speed you do it with voltage control and not PWM signals. There is really nothing you can do to make them PWM controlled.

    http://en.wikipedia.org/wiki/Pulse-width_modulation

    The 4th pin is the one controlling the PWM signal and based on that signal the fan changes it speed.

    You will have to use some kind of program or your fan speed setting in BIOS to control the SP120s.
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  2. #2902
    Quote Originally Posted by Xuvial View Post
    Ok I'm seriously confused with PWM and non-PWM fans. See, I plugged a single Corsair SP120 fan (3pin) to my CPU fan header (4pin) but no matter what the CPU temp was, the bugger kept spinning at 1370rpm in my hand. The whole time, from startup to a P95 run. So it seems the CPU fan header is unable to slow the fan down based on CPU temp, but the fan that came with my Hyper212 (CM Blademaster 120mm) has a 4-pin connector and that thing adjusted it's speed really well.

    Soooo what this means is that I need to find a way to connect the 4th pin to my SP120's somehow. I mean come on, these fans were made to cool radiators! They can undervolt just fine, I've had them spinning at all sorts of low speeds all this time, so I see absolutely no reason why the CPU fan header can't slow it down??? What does the 4th pin DO exactly that can't be done with 3 (or even 2) pins?

    I was originally planning to use a fan splitter to connect both SP120's (H100) to the CPU fan header on the mobo. No, connecting them to the H100 unit itself is a bad idea because they keep spinning at max RPM's no matter what.
    The fourth pin is indeed the one that is used to tell a fan how fast to spin, my noctuas on the CPU header spin at 1260 RPM no matter what I do in the Asus fan control software because they are 3 pin, not 4. One of these days I'll remember to put that resistor in to slow them down (although they aren't loud as it is right now).
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  3. #2903
    I am Murloc! Xuvial's Avatar
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    Hmmm I used to think that the CPU header simply undervolted the fan as necessary. So the PWM signal is something different (without getting into the physics of it :P).
    Quote Originally Posted by n0cturnal View Post
    The SP120 are not PWM, if you want to control their speed you do it with voltage control and not PWM signals. There is really nothing you can do to make them PWM controlled.

    http://en.wikipedia.org/wiki/Pulse-width_modulation

    The 4th pin is the one controlling the PWM signal and based on that signal the fan changes it speed.

    You will have to use some kind of program or your fan speed setting in BIOS to control the SP120s.
    Thanks for this. I think the Chassis fan connectors have the ability to undervolt according to the case temperature, I'll playing around with that tomorrow.

  4. #2904
    http://www.almico.com/speedfan.php can sometimes control fan speed with voltage regulation, it really depends on your motherboard.
    You can have the fans adjust to any temperature sensor the program manages to read.
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  5. #2905
    What motherboard are you using again? Using some fan software, you can adjust the speed of the fan from within said software. You may also be able to adjust it in the BIOS, perhaps.

  6. #2906
    I am Murloc! Xuvial's Avatar
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    Sabertooth P67, it's got some features n' stuff which I'll dig into later.
    Last edited by Xuvial; 2013-01-17 at 02:12 PM.

  7. #2907
    Quote Originally Posted by Butler Log View Post
    One of these days I'll remember to put that resistor in to slow them down (although they aren't loud as it is right now).
    I did that recently! Added resistors to my NH-D14 and to my exhaust fan (the intake fan is on a built in switch). I can't believe how much quieter my PC is now!
    Last edited by noteworthynerd; 2013-01-17 at 03:13 PM.

  8. #2908
    Quote Originally Posted by protput View Post
    Does yours OC well?
    Not sure yet; just got it yesterday and wanted to verify it had the unlocked voltage on the 2nd bios. I might try it this weekend.

    I actually would've ended up with the 7970 version but it only supports single link DVI without a displayport to dual-link DVI adapter and screw spending an additional $100 bucks just so I can run my monitor at 120hz.

  9. #2909
    Quote Originally Posted by nbm02ss View Post
    Not sure yet; just got it yesterday and wanted to verify it had the unlocked voltage on the 2nd bios. I might try it this weekend.

    I actually would've ended up with the 7970 version but it only supports single link DVI without a displayport to dual-link DVI adapter and screw spending an additional $100 bucks just so I can run my monitor at 120hz.
    That is pretty lame.
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  10. #2910
    TOTALLY NOT
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    That is why monitors need to stop having HDMI and DVI to begin with.

  11. #2911
    The Lightbringer CheezusCrust's Avatar
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    I need the DVI on my shimian
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  12. #2912
    So switching from the NZXT Phantom to the Coolermaster Storm Trooper seems to have been worth it. Card now idles at 25C where yesterday it was at 34-35C. Plus it's quieter since I no longer have to listen to those damned cheap ass 200mm fans rattling. I also swapped the stock Corsair fans on my H70 for some Scythe Gentle Typhoons.

  13. #2913
    Quote Originally Posted by nbm02ss View Post
    So switching from the NZXT Phantom to the Coolermaster Storm Trooper seems to have been worth it. Card now idles at 25C where yesterday it was at 34-35C. Plus it's quieter since I no longer have to listen to those damned cheap ass 200mm fans rattling. I also swapped the stock Corsair fans on my H70 for some Scythe Gentle Typhoons.
    I got about the same result when I recently switched from a Fractal Design Define R2 to Silverstone Fortress FT02.

    My CPU went down from high 30's when idle to 25-26c and my GPU went from 45ish to 29c.

    Only problem now is that I need to get a new PSU since my cables are a bit too short for any kind of proper cable management and the positioning of the PSU made me even more aware of the annoying sound from the ball bearing in the fan.
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  14. #2914
    Quote Originally Posted by nbm02ss View Post
    Not sure yet; just got it yesterday and wanted to verify it had the unlocked voltage on the 2nd bios. I might try it this weekend.

    I actually would've ended up with the 7970 version but it only supports single link DVI without a displayport to dual-link DVI adapter and screw spending an additional $100 bucks just so I can run my monitor at 120hz.
    Your monitors don't support displayport?

  15. #2915
    Quote Originally Posted by n0cturnal View Post
    I got about the same result when I recently switched from a Fractal Design Define R2 to Silverstone Fortress FT02.

    My CPU went down from high 30's when idle to 25-26c and my GPU went from 45ish to 29c.

    Only problem now is that I need to get a new PSU since my cables are a bit too short for any kind of proper cable management and the positioning of the PSU made me even more aware of the annoying sound from the ball bearing in the fan.
    I really wanted the FT02 initially, but I hate bear hugging a tower whenever I want to take it to a friend's house, so I settled on the CM case. If my computer sat in one place for prolonged periods of time I would've gotten the FT02 no question.

    ---------- Post added 2013-01-18 at 02:10 PM ----------

    Quote Originally Posted by Drunkenvalley View Post
    Your monitors don't support displayport?
    ASUS VG236HE is HDMI or DVI. No displayport sadly. :\ Had the BenQ XL2420T been available when I was shopping for a 120hz I probably would have picked that up, buuuuuuut knowing what I know now if I were to be in a position to need another primary monitor I'd probably just go IPS.

  16. #2916
    That's a shame man. Oh well.

  17. #2917
    Quote Originally Posted by Drunkenvalley View Post
    That's a shame man. Oh well.
    Yup. Indeed it is. Fortunately I canceled the 7970 when I realized it wasn't going to work. I would've felt like a jackass with a new $500 card and a gimped monitor. lol

  18. #2918
    I am Murloc! Cyanotical's Avatar
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    found this on reddit, it's worth the read if you've got 10 minutes

    http://www.reddit.com/r/Games/commen...extgen/c7zfgtg

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  19. #2919
    Quote Originally Posted by Cyanotical View Post
    found this on reddit, it's worth the read if you've got 10 minutes

    http://www.reddit.com/r/Games/commen...extgen/c7zfgtg
    Nice read, I'm not a real fan of consoles, but if the thing about PS4 running linux, it bodes well for linux gaming in the future.

  20. #2920
    I would love to see PS4 running Linux. I haven't used Linux for almost 10 years now since I spend so much of my time gaming and I'm too lazy to dual boot. With games being properly ported or even developed for Linux that could easily change.
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