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PWM fans all show different speeds, and CPU fans won't spin up...confused - Page 2

post #11 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

If PWM is selected I would expect the 3-pin fan to run full speed all the time. PWM pinout is grd, 12v, rpm, PWM. Fan gets 12v all the time. PWM fans have a small PCB that receives PWM signal and pulses the 12v power going to fan to control it's speed.

I'm going to go through some of the combinations again to make sure I know what I'm talking about
 
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post #12 of 21
Thread Starter 
ok, so yes PWM vs voltage did not make a difference.

I noticed that when I first turned on the PC that 1 of the CPU fans spun up. shut down and tried again and it didn't - seems hit or miss, like it just needs a bit more oomph. frustrating because I know the juice is there, when I first hit the power button everything seems to spin full bore for a few seconds and then the 2 CPU fans throttle down and stop completely.

once I got into windows I hit the PC with prime95 just to get the temps up, and that actually caused both CPU fans to start spinning (BIOS set to PWM). when I stopped prime they continued to spin, did not stop. I'm happy that they started when the temps went up, but it's still a little nerve wracking not knowing every time I turn the thing on if the fans are going to work or not...
 
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post #13 of 21
Quote:
Originally Posted by 7slinger View Post

ok, so yes PWM vs voltage did not make a difference.

I noticed that when I first turned on the PC that 1 of the CPU fans spun up. shut down and tried again and it didn't - seems hit or miss, like it just needs a bit more oomph. frustrating because I know the juice is there, when I first hit the power button everything seems to spin full bore for a few seconds and then the 2 CPU fans throttle down and stop completely.

once I got into windows I hit the PC with prime95 just to get the temps up, and that actually caused both CPU fans to start spinning (BIOS set to PWM). when I stopped prime they continued to spin, did not stop. I'm happy that they started when the temps went up, but it's still a little nerve wracking not knowing every time I turn the thing on if the fans are going to work or not...
This is with 3-pin fan and no adapter?
PWM control to a 3-pin fan supplies 12v to fan.. fan runs full speed. Only thing I can think of that would allow fan to change speed is if the PWM setting is actually an "automatic" setting that selects PWM control only if PWM lead is connected and working. When using 3-pin fan without PWM lead it uses voltage control.

Could you post a picture of how fan leads are connected to motherboard?
post #14 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

This is with 3-pin fan and no adapter?
PWM control to a 3-pin fan supplies 12v to fan.. fan runs full speed. Only thing I can think of that would allow fan to change speed is if the PWM setting is actually an "automatic" setting that selects PWM control only if PWM lead is connected and working. When using 3-pin fan without PWM lead it uses voltage control.

Could you post a picture of how fan leads are connected to motherboard?

no this was with both fans connected to the Y adapter that came with the phantek

what it's come down to so far is that if I hook up 1 fan to CPU header (either one of the 2) it spins up just fine, regardless of how I have BIOS set up.

if I have both fans to the Y adapter to the CPU header, usually neither fan remain spinning after an initial burst when I press the power button. a few times one fan out of the 2 has remained spinning...this is if the fans are set to PWM. if they are set full speed (so speed control disabled in BIOS) then they both spin up at startup and remain spinning.

I can try each individual fan directly to the header without the adapter a bit later today.
 
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post #15 of 21
First let us get our terminology straight.
  • "Y" Splitter = fan plug on leg of "Y:" and fan sockets on the top of "Y".
  • PWM Adapter = 4pin fan plug to 3pin fan socket with components in-between covered with heatshrink.

I only say this because it is often hard for people texting info to understand exactly what each is saying. biggrin.gif
post #16 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

First let us get our terminology straight.
  • "Y" Splitter = fan plug on leg of "Y:" and fan sockets on the top of "Y".
  • PWM Adapter = 4pin fan plug to 3pin fan socket with components in-between covered with heatshrink.

I only say this because it is often hard for people texting info to understand exactly what each is saying. biggrin.gif

yes, the adapter that I'm using that came with the phantek is a Y splitter plugged into a PWM adapter. the adapter plugs to the board, the other end to the Y splitter, the 2 ends of the "Y" to the 2 fans
 
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post #17 of 21
Y splitter and PWM adapter.

Plug the fan directly into the motherboard CPU fan header. You can even use the & splitter. BUT DO NOT USE THE PWM ADAPTER!!

If fan runs full speed than the motherboard CPU fan header is functioning on PWM control.

if fan speed varies than the motherboard CPU fan header is functioning on variable voltage control
post #18 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Y splitter and PWM adapter.

Plug the fan directly into the motherboard CPU fan header. You can even use the & splitter. BUT DO NOT USE THE PWM ADAPTER!!

If fan runs full speed than the motherboard CPU fan header is functioning on PWM control.

if fan speed varies than the motherboard CPU fan header is functioning on variable voltage control

ok plugged the Y adapter without PWM adapter directly into the MB CPU header, both fans plugged into Y adapter.

with BIOS set on PWM control for CPU fans are both running at full speed.

with BIOS set on voltage control for CPU fans are both running at about half speed, but I don't think speed was varying. I hit system with prime95 for a minute and I don't think fan speed increased
 
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post #19 of 21
Okay, Have you loaded and tried adjusting the temp to rpm curve with ET6?
post #20 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Okay, Have you loaded and tried adjusting the temp to rpm curve with ET6?

actually a little while ago today I installed ET6 but it is not working. I double click it or select run or whatever method to start the program, and the hourglass pops up for a second as the computer thinks about it, but nothing ever happens...tried uninstall reinstall, no dice. frustrated.
 
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