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Getting lower RPM than advertised?

post #1 of 46
Thread Starter 
I bought this fan for my case when I completely redid the thing. http://www.newegg.com/Product/Produc...82E16835228001
I'd have bought a 120mm fan, but the case is ten and a half years old, no go.

Anyway, my question is: The specs sheet clearly rates it at 2000 RPM, give or take 10 percent, and yet I'm only getting ~1500 RPM out of it. It's plugged into a 3-pin on the motherboard, so it's not the motherboard slowing it down. I also disabled fan control of it just to be sure.

What should I do? With my current system, I have to keep my case open for fear of it getting too warm for comfort while running Folding@Home SMP.

I'd prefer for any solutions to not require anything with rewiring, though that is an option.

Thank you for any help.
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post #2 of 46
Depending on what motherboard, they can still control 3 pin fans. Ah I see you have a gigabyte board. Ok go into BIOS then into "PC Health Status" then to "CPU Smart Fan Control", then disable this.

Once you have done that go to "CPU Smart Fan Mode" now set this to voltage.

This should have them spinning at full in no time. Also bare in mind that fans are rated @ +/- 10% so that fan will work within 1800 RPM and 2200 RPM.
Edited by smash_mouth01 - 1/24/11 at 9:23pm
post #3 of 46
Thread Starter 
I've got a real bargain-bin, $45 motherboard... Plus, I have never, ever, ever seen any fluctuation in speed, so I doubt that that's it. :\\
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post #4 of 46
But did you try what I said to do in BIOS?
post #5 of 46
It could actually be a bunch of different things equating this. To be honest when you buy really cheap part like that you usually get what you pay for, theres a chance the fan could just be over rated, or you might just have a bum fan.

If you have another pc at your disposal you can try the fan on a different board and see if you get the same reading.

I mean if i was to make a list of what could be the top suspects it would be

1. Faulty fan
2. over rated fan
3. false readon on MB
3. faulty header on MB

Your best bet would be to either just get another one and see if the same thing happens or buy a better quality fan.
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post #6 of 46
Thread Starter 
Quote:
Originally Posted by smash_mouth01 View Post
But did you try what I said to do in BIOS?
I believe I said that I had in the original post, but I will try again.
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My System
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CPUMotherboardGraphicsRAM
i5 3570k - 4.3 GHz ~1.16V ASRock Z77 Extreme4-M Gigabyte HD 7870 8GB G.Skill Sniper DDR3 1600 9-9-9-24 
Hard DriveHard DriveHard DriveCooling
Crucial M4 128GB WD Blue WD10EZEX 1TB WD Green WD5000AADS 500GB Hyper 212 EVO 
OSMonitorMonitorKeyboard
Windows 7 Crossover 27Q Dell SR2320L Logitech G510 
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post #7 of 46
Thread Starter 
Quote:
Originally Posted by Therionx View Post
It could actually be a bunch of different things equating this. To be honest when you buy really cheap part like that you usually get what you pay for, theres a chance the fan could just be over rated, or you might just have a bum fan.

If you have another pc at your disposal you can try the fan on a different board and see if you get the same reading.

I mean if i was to make a list of what could be the top suspects it would be

1. Faulty fan
2. over rated fan
3. false readon on MB
3. faulty header on MB

Your best bet would be to either just get another one and see if the same thing happens or buy a better quality fan.
Yeah, I think I will get a different fan. This fan does not have quite enough flow for me to fold 24/7.
My System
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CPUMotherboardGraphicsRAM
i5 3570k - 4.3 GHz ~1.16V ASRock Z77 Extreme4-M Gigabyte HD 7870 8GB G.Skill Sniper DDR3 1600 9-9-9-24 
Hard DriveHard DriveHard DriveCooling
Crucial M4 128GB WD Blue WD10EZEX 1TB WD Green WD5000AADS 500GB Hyper 212 EVO 
OSMonitorMonitorKeyboard
Windows 7 Crossover 27Q Dell SR2320L Logitech G510 
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My System
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CPUMotherboardGraphicsRAM
i5 3570k - 4.3 GHz ~1.16V ASRock Z77 Extreme4-M Gigabyte HD 7870 8GB G.Skill Sniper DDR3 1600 9-9-9-24 
Hard DriveHard DriveHard DriveCooling
Crucial M4 128GB WD Blue WD10EZEX 1TB WD Green WD5000AADS 500GB Hyper 212 EVO 
OSMonitorMonitorKeyboard
Windows 7 Crossover 27Q Dell SR2320L Logitech G510 
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post #8 of 46
Is this fan under any load, Like fighting against Positive or negative pressure ?

Or as you said just get a better fan.
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Aces and Eights
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955 X4 BE [3.82 Ghz] Lanparty DK 790FX  HIS 6870 X 2 CFX 4Gig OCZ Reaper DDR2 800 
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2X Hitachi 1TB raid 0 Seagate Barracuda Sony DVD RW DRU 830A  Coolermaster Hyper 212+  
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post #9 of 46
Thread Starter 
Quote:
Originally Posted by Doom View Post
Is this fan under any load, Like fighting against Positive or negative pressure ?

Or as you said just get a better fan.
Not really, the computer has been sitting with the case open, and the fan is still slow.

Thanks to everyone for your help.
My System
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5 3570k - 4.3 GHz ~1.16V ASRock Z77 Extreme4-M Gigabyte HD 7870 8GB G.Skill Sniper DDR3 1600 9-9-9-24 
Hard DriveHard DriveHard DriveCooling
Crucial M4 128GB WD Blue WD10EZEX 1TB WD Green WD5000AADS 500GB Hyper 212 EVO 
OSMonitorMonitorKeyboard
Windows 7 Crossover 27Q Dell SR2320L Logitech G510 
PowerCaseMouseMouse Pad
OCZ StealthXStream 2 600w HAF 912 Razer Deathadder 2013 Steelseries QcK Mini 
  hide details  
Reply
My System
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5 3570k - 4.3 GHz ~1.16V ASRock Z77 Extreme4-M Gigabyte HD 7870 8GB G.Skill Sniper DDR3 1600 9-9-9-24 
Hard DriveHard DriveHard DriveCooling
Crucial M4 128GB WD Blue WD10EZEX 1TB WD Green WD5000AADS 500GB Hyper 212 EVO 
OSMonitorMonitorKeyboard
Windows 7 Crossover 27Q Dell SR2320L Logitech G510 
PowerCaseMouseMouse Pad
OCZ StealthXStream 2 600w HAF 912 Razer Deathadder 2013 Steelseries QcK Mini 
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post #10 of 46
yo why not get a new heatsink op ;D would help temps more then a fan would. :] might even come with a fan or 2 haha
    
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