Bitcoin Forum
December 03, 2016, 12:29:07 AM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Gigabyte PWM fan wiring question - with pictures!  (Read 7048 times)
amazingrando
Hero Member
*****
Offline Offline

Activity: 546



View Profile
March 21, 2012, 08:47:24 AM
 #1

I have a couple of these Gigabyte 5850 OC cards (which I hate - the cooler is crap):



Today one of the fans literally fell off.  The other one is not in much better shape.

I have two brand new fans of the exact same model (used in Asus DirectCU 5850's)

I'm trying to figure out the wiring.  It seems that the 4-wire PWM wiring is as follows:
Pin    Name    Color
1    GND          black
2    +12VDC     yellow
3    Sense       green
4    Control      blue

On the Asus fan, it has these four wires and a 4 pin connector.


On the Gigabyte card there are two fans in a master/slave configuration.


The slave appears to just have 12V DC (red not yellow) and a black ground wire.  The master appears to have ground (black), 12V DC (red), and a third wire.  Would that third wire be sense or control?  I'm guessing it's sense, which would be green on the Asus' 4-wire configuration




The other question is whether the Asus fan, which has all four wires, will work fine if that missing wire is not connected to the fan?  The Gigabyte connector is only a three pin.  I'm assuming it would work fine - similar to a 3 pin system fan on a 4 pin header.


Bitbond - 105% PPS mining bond - mining payouts without buying hardware
1480724947
Hero Member
*
Offline Offline

Posts: 1480724947

View Profile Personal Message (Offline)

Ignore
1480724947
Reply with quote  #2

1480724947
Report to moderator
1480724947
Hero Member
*
Offline Offline

Posts: 1480724947

View Profile Personal Message (Offline)

Ignore
1480724947
Reply with quote  #2

1480724947
Report to moderator
1480724947
Hero Member
*
Offline Offline

Posts: 1480724947

View Profile Personal Message (Offline)

Ignore
1480724947
Reply with quote  #2

1480724947
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1480724947
Hero Member
*
Offline Offline

Posts: 1480724947

View Profile Personal Message (Offline)

Ignore
1480724947
Reply with quote  #2

1480724947
Report to moderator
jake262144
Full Member
***
Offline Offline

Activity: 210


View Profile
March 21, 2012, 10:06:18 AM
 #2

Yellow (that 'third wire') is sense.
You can use the ASUS fan safely as long as you don't botch the cablology.

That cooler is not necessarily crap, be advised that heatpipe orientation can make one hell of a difference.
malevolent
can into space
Staff
Legendary
*
Offline Offline

Activity: 1624



View Profile
March 21, 2012, 11:12:01 AM
 #3

Yellow (that 'third wire') is sense.
You can use the ASUS fan safely as long as you don't botch the cablology.

That cooler is not necessarily crap, be advised that heatpipe orientation can make one hell of a difference.

I actually have two 5870 with same/similar cooler and it only cools the GPU well with fan @ 85% (only ~3.2k RPM, they aren't fast), VRAM modules and VRMs get pretty hot.
but thanks for the link, I did notice a difference of several degrees with different orientation, even though the card now gets a bit of warm PSU exhaust air and gets probably slightly warmer inhaust air because there are cables close to the fans. In a seemingly better position (-90deg) the temperatures were worse (5-6C).
amazingrando
Hero Member
*****
Offline Offline

Activity: 546



View Profile
March 21, 2012, 04:45:21 PM
 #4

Yellow (that 'third wire') is sense.
You can use the ASUS fan safely as long as you don't botch the cablology.

That cooler is not necessarily crap, be advised that heatpipe orientation can make one hell of a difference.

Thanks!  I didn't want to start cutting up wires without knowing what was what.

Interesting link about the orientation.  Mine are mounted vertically, but I'll fiddle with that.  Even if orientation does help other coolers seem to work well regardless of orientation, which in my book is crap.  Cheesy

Bitbond - 105% PPS mining bond - mining payouts without buying hardware
jake262144
Full Member
***
Offline Offline

Activity: 210


View Profile
March 21, 2012, 05:41:42 PM
 #5

Ummm... there are actually two links - you need to pass a perception check (6 perception required) to notice that the two words underline independently when hovered over  Wink

The order fan wires are connected in was designed for maximum compatibility: 4-pin fans can be connected to 3-pin fan headers (the blue PWM wire remains disconnected) and vice versa.
Black always means neutral and must be connected.
Cablez
Legendary
*
Offline Offline

Activity: 1400


I owe my soul to the Bitcoin code...


View Profile
March 21, 2012, 08:17:37 PM
 #6

Its weird but on my GB5870 the master and slave fans both had three wires.  I just used ebay sourced replacements to fix it.

I will need to test that heatpipe orientation though because that cooler is garbage.  Tongue

Tired of substandard power distribution in your ASIC setup???   Chris' Custom Cablez will get you sorted out right!  No job too hard so PM me for a quote
Check my products or ask a question here: https://bitcointalk.org/index.php?topic=74397.0
amazingrando
Hero Member
*****
Offline Offline

Activity: 546



View Profile
March 21, 2012, 09:57:19 PM
 #7

Ummm... there are actually two links - you need to pass a perception check (6 perception required) to notice that the two words underline independently when hovered over  Wink

Haha.  Without the underlining of a link it looked like it was one link.  I would have never known if you hadn't mentioned it Wink

The order fan wires are connected in was designed for maximum compatibility: 4-pin fans can be connected to 3-pin fan headers (the blue PWM wire remains disconnected) and vice versa.
Black always means neutral and must be connected.

That's what I figured.  I'll give it a try tonight and see what happens!

Bitbond - 105% PPS mining bond - mining payouts without buying hardware
amazingrando
Hero Member
*****
Offline Offline

Activity: 546



View Profile
March 22, 2012, 01:56:48 AM
 #8

Ok, I got it all put together and it works!   Grin  Here's the wiring:



And here it is all assembled - I like the Asus fans on the Gigabyte GPU.  haha


Bitbond - 105% PPS mining bond - mining payouts without buying hardware
Cablez
Legendary
*
Offline Offline

Activity: 1400


I owe my soul to the Bitcoin code...


View Profile
March 22, 2012, 02:05:45 AM
 #9

Looks good rando.  Have you tried it yet?  I noticed that the slave fan on mine does not spin up in idle mode but only kicks on when the gpu is stressed.  Have you seen this behavior, as I thought the fans should always be running?

Tired of substandard power distribution in your ASIC setup???   Chris' Custom Cablez will get you sorted out right!  No job too hard so PM me for a quote
Check my products or ask a question here: https://bitcointalk.org/index.php?topic=74397.0
amazingrando
Hero Member
*****
Offline Offline

Activity: 546



View Profile
March 22, 2012, 02:23:24 AM
 #10

Looks good rando.  Have you tried it yet?  I noticed that the slave fan on mine does not spin up in idle mode but only kicks on when the gpu is stressed.  Have you seen this behavior, as I thought the fans should always be running?

Yup, I tried it and it works.  Both fans spin up at idle.

I have seen what you are talking about in terms of only one fan on at idle - not on this car - but another card.  Not sure why one would do it and not another.  But I guess as long as they are running when mining then it's all good.

Bitbond - 105% PPS mining bond - mining payouts without buying hardware
Cablez
Legendary
*
Offline Offline

Activity: 1400


I owe my soul to the Bitcoin code...


View Profile
March 22, 2012, 02:52:08 AM
 #11

I hear you.  Thanks for the reply.  Smiley

Tired of substandard power distribution in your ASIC setup???   Chris' Custom Cablez will get you sorted out right!  No job too hard so PM me for a quote
Check my products or ask a question here: https://bitcointalk.org/index.php?topic=74397.0
dropt
Legendary
*
Offline Offline

Activity: 1442



View Profile
March 22, 2012, 07:18:58 AM
 #12

Ok, I got it all put together and it works!   Grin  Here's the wiring:



I'd keep a damn close eye on that electrical tape.  It doesn't play well around constant heat.  If you feel so enclined: 

http://www.ebay.com/itm/2m-White-2mm-Tube-Sleeving-Heat-Shrink-Tubing-/160767521814?pt=LH_DefaultDomain_0&hash=item256e7db416#ht_2142wt_952

No sense in burning out the fan controller from a short.
amazingrando
Hero Member
*****
Offline Offline

Activity: 546



View Profile
March 22, 2012, 07:44:28 AM
 #13

I'd keep a damn close eye on that electrical tape.  It doesn't play well around constant heat.  If you feel so enclined: 

http://www.ebay.com/itm/2m-White-2mm-Tube-Sleeving-Heat-Shrink-Tubing-/160767521814?pt=LH_DefaultDomain_0&hash=item256e7db416#ht_2142wt_952

No sense in burning out the fan controller from a short.

Thanks for the link.  It came from the factory with a form of flexible fabric electrical tape.  I'll keep an eye on it and see how it runs.

Bitbond - 105% PPS mining bond - mining payouts without buying hardware
dropt
Legendary
*
Offline Offline

Activity: 1442



View Profile
March 22, 2012, 09:09:01 AM
 #14

I'd keep a damn close eye on that electrical tape.  It doesn't play well around constant heat.  If you feel so enclined: 

http://www.ebay.com/itm/2m-White-2mm-Tube-Sleeving-Heat-Shrink-Tubing-/160767521814?pt=LH_DefaultDomain_0&hash=item256e7db416#ht_2142wt_952

No sense in burning out the fan controller from a short.

Thanks for the link.  It came from the factory with a form of flexible fabric electrical tape.  I'll keep an eye on it and see how it runs.

Run of the mill black electrical tape goes tacky instead of sticky when it's been heated sufficiently.  Add some vibration and tape wrapped around onto itself it will loosen up/unravel.  I hear what you're saying about the fabric backed tape.  They must use a different adhesive, or possibly the fibre backing prevents it from loosing its grip.  Either way, would hate to see you loose a card in the event it goes awry.  You may end up just fine though.
Cablez
Legendary
*
Offline Offline

Activity: 1400


I owe my soul to the Bitcoin code...


View Profile
March 24, 2012, 05:32:21 PM
 #15

I changed the orientation of my GB5870 from the heatpipes at the highest point to the fans facing up and I have seen a decrease in temps of about 3 degrees.  Not huge but I'll take it.   Grin

Tired of substandard power distribution in your ASIC setup???   Chris' Custom Cablez will get you sorted out right!  No job too hard so PM me for a quote
Check my products or ask a question here: https://bitcointalk.org/index.php?topic=74397.0
amazingrando
Hero Member
*****
Offline Offline

Activity: 546



View Profile
March 24, 2012, 08:59:21 PM
 #16

I changed the orientation of my GB5870 from the heatpipes at the highest point to the fans facing up and I have seen a decrease in temps of about 3 degrees.  Not huge but I'll take it.   Grin


Did you also try fans facing down - the way it would be if it was in a computer case?  Curious to know how that performs

Bitbond - 105% PPS mining bond - mining payouts without buying hardware
Cablez
Legendary
*
Offline Offline

Activity: 1400


I owe my soul to the Bitcoin code...


View Profile
March 24, 2012, 10:12:15 PM
 #17

Actually I didn't because I had put it into my inverted atx rig for the test. Door open and no extra or top fans so its real similar to my open frame rig.  With this setup I cannot do fans down though, sorry.

Tired of substandard power distribution in your ASIC setup???   Chris' Custom Cablez will get you sorted out right!  No job too hard so PM me for a quote
Check my products or ask a question here: https://bitcointalk.org/index.php?topic=74397.0
pirateat40
Avast Ye!
Sr. Member
****
Offline Offline

Activity: 378


"Yes I am a pirate, 200 years too late."


View Profile WWW
March 24, 2012, 10:13:31 PM
 #18

You're fine, looks good.

Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!