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post #841 of 1011
I've thought about how you guys power both motors off of the Molex, and I think I'm going to do it that way too. I "can" run one of them off of the MB, but why not remove a 1.7A. load from the motherboard if I can. It might leave more power for the CPU. Thanks guys.

I did look at the spec. sheet and saw 0.5V for the signal wire not the 5V. I thought it was. Thanks again.
Edited by Retrorockit - 9/7/15 at 8:47am
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post #842 of 1011
Quote:
Originally Posted by Retrorockit View Post

I've thought about how you guys power both motors off of the Molex, and I think I'm going to do it that way too. I "can" run one of them off of the MB, but why not remove a 1.7A. load from the motherboard if I can. It might leave more power for the CPU. Thanks guys.

I did look at the spec. sheet and saw 0.5V for the signal wire not the 5V. I thought it was. Thanks again.

Most PWM fans that I can think of will go full RPM if you remove the PWM signal wire, so in theory if you make a basic hardwire switch to only your PWM wire, as soon as it is disconnected all fans should spin up to 100%, then when you reconnect the PWM via switch I expect they would gain the signal back and spin down. I'm thinking of doing a hardwire switch like that, so it was something I had in mind to try. If you try it report back, I'd like to know if it works biggrin.gif
post #843 of 1011
That sound like I could go to my local computer recycler, fire up an old Dell and cut the wire to see what happens.
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post #844 of 1011
I went to Overclocking.com where Bing the fan control wizard posts, and got the same answer. Turn off the PWM wire for full fan speed.
It's funny that something that simple isn't more widely known.
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post #845 of 1011
The reply I got there was from BobNova another resident expert there. I saw some really beautiful stuff they're doing. Way beyond my abilities.
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post #846 of 1011
Did you mean overclockers.com? I talked with Bobnova a lot over email, I was going to buy one of his PWM booster boards for my project, but I think he got busy or something so the emails stopped. Looks like I didn't actually need one but they are a really nice design.
post #847 of 1011
They were just welcoming him back when he replied to my question. Beautiful stuff they're doing over there. I'm OK with electrical, but not electronics. So a toggle switch is about right for me. Probably going to get one of their controllers later.
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post #848 of 1011
I installed my Delta GFB1212VHG "twin engine" fan today in my Dell Dimension E520. It did everything I hoped it would. It was quieter at all loads than the single Delta AFC1212DE I took out. It speeds up about 8*C sooner and cools things off before they get much over 70*C. I ran the power and ground to a Molex on the psu and PWM and tach. to the MB.
This freed up some voltage on the MB. Now I can get 1.5875V. where before 1.5250V. as about it.

There's just one problem. The first time it ran during the POST the fan ran up to full speed. Normal for a dell. But since then at Boot it shows a "previous fan failure" error and I have to hit F1 to proceed, and the fan check doesn't happen anymore. Any insight into what it's looking for, and any solution?
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post #849 of 1011
Quote:
Originally Posted by Retrorockit View Post

I installed my Delta GFB1212VHG "twin engine" fan today in my Dell Dimension E520. It did everything I hoped it would. It was quieter at all loads than the single Delta AFC1212DE I took out. It speeds up about 8*C sooner and cools things off before they get much over 70*C. I ran the power and ground to a Molex on the psu and PWM and tach. to the MB.
This freed up some voltage on the MB. Now I can get 1.5875V. where before 1.5250V. as about it.

There's just one problem. The first time it ran during the POST the fan ran up to full speed. Normal for a dell. But since then at Boot it shows a "previous fan failure" error and I have to hit F1 to proceed, and the fan check doesn't happen anymore. Any insight into what it's looking for, and any solution?

Most BIOS have an option to disable the CPU header fan failure checking, you might look for that.

If that is not an option, you may have to run a "dummy" load from the CPU fan header. It's really strange to me but I had a similar problem, pulling PWM signal from my GPU they wouldn't actually give a PWM signal unless there was a 12v load as well. I ended up just adding a LED onto the 4pin fan header to complete the circuit (pulling 12v), and then left RPM/PWM going to my fans. Works fine now.
post #850 of 1011
No BIOS option in Dell. Would any LED work? I'm only competent at wiring I'm afraid. How are they rated, volts, ohms, watts?
Dell Dimension E520 with locked BIOS 4Ghz. on QX6800.
http://valid.x86.fr/l2j5p1

This is the result I got taking the fan off of the MB, and unplugging the PWM wire.
Edited by Retrorockit - 9/29/15 at 6:53am
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