p870tm 2nd CPU fan port!

p870tm motherboard was actually designed with the 2nd CPU fan in mind, so was the CPU HS!

wandering if it's 12v or 5vm...

@Prema? @Papusan? @Mr. Fox?

 

12V
http://forum.notebookreview.com/threads/official-clevo-p870tm-owners-lounge.809623/page-34
"Pinout seems to be
1=positive = 5.2V
2=positive = 2.0V
3=positive = 5.2V
4=negative

This is what I got out of testing mine right now."

http://forum.notebookreview.com/threads/official-clevo-p870tm-owners-lounge.809623/page-35

Just skimming, tons of info in the owners thread about this. Plus different fans etc.

 

Seems like this kind of info should have a separate thread to be discussed at!

 

Can use this thread for discussion a possible second Cpu fan. @ole!!! @Johnksss

 

yea john posted the pin out info from b4. btw is that how 12v works? if so we'd need to find a 5mm 12v fan first and make sure the wiring is similar otherwise worst case would just be 5v. waiting for the fan to arrive.

 

Spoiler

They never actually shipped KBL-R dev-units with that FAN, so I don't know what exact FAN model they intend to use for CFL...but I am sure if you are searching taobao long enough you'll find it.

 

4-pin fan, with integrated power driver. Needs only low-power PWM signal on control pin to RPM controll, or, if left this pin floating, fan will be working on full speed.

First, we need to check if this output is enabled in EC. If yes, voltage on pin 2 should change toghether with speed change of main fan.

 

honestly though i wouldnt mind have a fan running on 5v at full speed, noise and temp reduction result will dedicate the final decision, though having more choices to do fan control is better.

 

something like this?

https://www.ebay.com/itm/Smart-Spee...242705?hash=item2136702fd1:g:F8kAAOSwkNtaUIkX

 

nice find. i'd have the fan at 45/60% of the time to see how it'll impact performance on cooling

 

Adding a smaller fan you are unlikely to see a noise reduction.

 

just have to put up with it. tbh right now the 2nd gpu fan is quite loud even though theres nothing its cooling other than internal hardware like ssd/mobo. cpu is very quiet, i wish i could up it a bit so my regular usage temp doesnt spike to 79/80c, basically doesnt seem to fan start to spin until like high 70c or at 80c, the software ccc simply wont work on server OS..which is literally just windows 8.1

 

hope the added fan will lower those by 3-4c.. fingers crossed. fan should arrive in a few days, 42*50*5mm type, only 3.3v and 0.35A. just purchased other fans 6mm/7mm types .5v and .5Amps and will compare difference.

below is 24/7 4.9ghz on default fan profile by clevo, auto fan profile.

 

3.3V fan will burn, conecctor is for 5V fans...

 

Yeah that's huge over drive on it.

 

Clevo fans I tested have voltage protection set to 6V. On this voltage level fan enters "hiccup" mode.
6V supply for 5V fan is 20% overdrive. For 3,3V fan this will be 3,95V max.

 

so you would need a 6v fan?

 

No, just 3,3V fan isn't good choice. Standard, 5V, 4-wire fan, like in Lonovo's, will work fine (of course, if this fan output is enabled in EC).

 

Has anyone got the 2nd fan going yet?

 

I purchased one from lenovo it works but how to get it to sit no go.

 

So it spins? Constantly or up and down with the main CPU fan?

DIY mods step 1... reach for the cable ties.

 

Like a turbine all the time i removed it

 

Maybe as a compromise use a variable resistor to find the right value and mod it to something reasonable.

 

donno if EC controls it or what not i'd treat that fan as disposable and have it run at all time. feels pretty weak tbh, could be because no lid so less air pressure. gonna make a lid for it which will also help mount to circled screw holes. double circle = screw grip can put a thin screw and mount it. single circle its used by the bottom cover so already has a screw, just need something that has a circle and held in place by it.

ps. after putting on bottom cover theres actually quite a bit more space, i dare say a 8mm fan would fit. will purchase 8mm fan and try next.

 

I'm ready for my next BGA-KILLER with 4 fans Maybe we will see GeForce GTX 2080 before the summer. But I want the full package.... 4 fans, 8 core i7 and 2080 Sli →→→ My BGA-Killer from 2015 will finally get a brother

 

A lid is needed for a blower fan certainly. In that config most of it is just spun in 360 degrees out.

 

Do you connected fourth (probably blue) wire to connector? This is speed control for this fan.

 

im more interested in single 2080 and z390 for possible PCH onboard wifi/bluetooth. if ipex connector is even built in along with PCH then i can use the wifi A+E slot for something else.

single 2080, 8 core, 4 fans, and lots of storage mods.

 

What about splicing in PWM from primary CPU fan connector?

FWIU, PWM is a pretty standard electrical signal that wouldn't be affected by splitting the wire into two?

 

i could try that, just have to figure out which color is the right one, blue/yellow for this HP fan. also even if i figured out the correct one how would i be able to test it to verify if i got the right one or not, FN+1?

currently with just GRND and 5v, in gaming its around 3-4 degree cooler, but the constant noise

 

Yellow pin is for speed measurement.
Leave yellow and blue wires unconnected and connect red wire with red wire of main fan.

In nearly all Clevos fan is drived by direct current, not PWM. Speed regulation is implemented by changing supply woltage via linear voltage regulator. This regulator is drived from little RC filer, that averages PWM signal from EC.
This four-wire fan can be also driving like three-wire fans, just leave fourth wire unconned.

 

so right now as you can see in the picture, red is to the right pin1 which is 5v, black is to most left pin4 ground. theres pin 2/3 not connected. do i connect the blue to either pin2/3, or do i splice the original CPU fan so both fan can be controled by primary cpu fan port.

also the primary cpu fan all black in color not sure which is which, pin 1-3 from top to bottom, which one is 12v/ground/control?

 

Connect blue wire to pin 2 - if EC have a module to control second CPU fan, fan should start to change speed along with main fan.

On main fan there is 12V/GND/CTRL, pins 1, 2, 3. You should buy cheapest multimeter like "830" model (there is a lot of different prefixes and suffixes in it's name, depending on manufacturer. In Poland we have this multimeter with names like M830BUZ, DT-830D, but all of them looks same).

 

Posted the PIN layout back here:

http://forum.notebookreview.com/threads/p870tm-2nd-cpu-fan-port.812706/#post-10662268

 

Yes, pictures say a thousand words, especially when it comes to wiring

 

prema do you know if EC would control 2nd CPU fan?

poprostujakub said "blue wire to pin 2 - if EC have a module to control second CPU fan, fan should start to change speed along with main fan."

 

I believe it just maxes out speed wise at the moment.

 

thats why asked if connecting pin2/3 will gain control over the fan.

 

left fan is the one without lid, right fan arrived today and it has a lid, just need to mount it on and already came with 2 screw holes, gonna look pretty gud!

 

Connecting the pins together? No that would just short two different lines.

 

no, meant connecting wires to pin 2/3

 

I believe there is no active control and it just sends a full speed signal all the time.

 

so whats the point of pin 2/3 then?

 

Should the fan be used in a future model the sense pin sends back the current RPM to the EC which will have the sensor switched on, it would likely panic and shut down without an expected value. Also a fan curve will be programmed into the EC to control the speed compared to CPU temperatures. Since the production model does not use it then this is not currently there.

 

so how you know 870TM model doesn't have control to this 2nd fan port?

if theres no control we maybe able to do a spliter from the main cpu pin

 

From other tests and comments from Prema.

 

@poprostujakub @Meaker@Sager

if primary cpu fan is controlled with just red/black, then we don't need the RPM signal for fan control by the mobo? any possible way to confirm this?

these fans may or may not fit was thinking of using the 12v ones to do splitter from primary CPU fan
12v, 0.18A https://www.ebay.com/itm/261875806386
12v, 0.10A https://www.ebay.com/itm/322310113321
5v, 0.4A https://www.ebay.com/itm/322133870001

also no idea which one would be most powerful, going by numbers its 5v 0.4A but could be totally wrong here.

 

Mobo doesn't control fan by measuring its speed, there are fixed voltage levels (fan speeds) that are included in fan table in EC. RPM information is only for indication if fan is present. You can drive fan with external supply in whole speed range (and slightly beyond) and EC will not do anything as long as fan sends any signal via yellow wire.
If you buy 12V fan, you'll be able to simple connect it parallel with main fan. But I'm worry about maximum current capability of driver IC. Theoretically, driver should be able to drive fans with current consumption up to 0,7A, but any device that contains electric motors, including fans, draws more current at startup and can trigger short circuit protection in IC. It's not dangerous, because driver IC will recover itself from short circuit protection mode to normal mode, but EC probably will start "fan-missing" shutdown procedure.

 

if we go by hard number, primary cpu fan is 0.5A and we get 2nd 12v fan say 0.1A and run it parallel to primary fan. would 2nd 12v fan speed be controlled by EC as well or would it constantly be at max, or would that be dependent on the 2nd fan specification what its capable of?

 

As I say earlier, speed of main fan is controlled by its supply voltage - 12V for max speed and probably 6V for minimum speed. So second fan, connected identical as main fan, will change its speed identical as main fan. Except, if second fan have higher start voltage (typically 12V fans have start voltage around 7-8V, but I don't know if this is also true for small fans), because on lowest RPM levels this fan can sometimes squeaks. I faced this situation once, when I tried to lower minimum GPU fan speed in my P375SM - with default voltage of 2,5V, I set 2,2V and fan started squeaks like coils, but louder. On 2,35V this fan worked good without any collateral effects.