Bitcoin Forum

Hello,

Just wondering why might there be a large difference between the two boards in the S5?

One board shows 53C, the other 59C.

There is a box fan sitting in front of the machine pushing from front to back. And there are two 120mm fans underneath the unit pushing air upward.

Cheers!

https://i.imgur.com/dRyS74y.png

Its normal. The blades are not mirror, so i'm guessing the sensor is a bit further back for one board considering the flow of the air. What really helped for me for noise and cooling was using 2 fans. I also used a box fan blowing air through at some point.

My 40 antminer s5 are running the same with 4-5 C diference ... there is no problem

Nice. Thanks for your replies  :D

It's the crappy sensors that bitmain is using. Placed like crap on  the middle of the blades! and the crappy open design for the air cooling ;D

I’ve seen even 10 degrees difference! but it was because one of the psu was feeding poorly it's blade, 1psu/1blade

also try re pasting the boards and clean out the heat sink give it a good cleaning if you haven't, i had that happen once i took it a part and cleaned it up real good and reapplied the themo paste ,  that S5 had a 2 or 3 degree difference after i cleaned it up etc. .

and here is a S5 i kept and fixed this is not the same one i talked about above.. This one had a 4 to 5 degree difference after i fixed it .  so i took it part once more did a really good cleaning re pasted etc..

https://i.imgur.com/A1N9SJS.png

now it runs better then it did when i bought it with one blade and replaced a blade etc .I'M also using S1 heat sinks they seem to work better then S5 heat sinks. and it also seems to run better over clocked then at defaults.

Most of my S5s had a 2-3 degree difference, but one (the one that runs the BEST oddly enough) shows 8-9 degrees all the time.

 I suspect part of it is just "how the sensor got positioned", some of it is "how well the heat sinks are conducting heat from the chips", and the rest is just normal manufacuting tolerances in the parts.

i have one S7 that has up to ~13-15C difference between boards.
Don't know why and how, just reporting what sensors say.

11c difference on s5!

made in china!!! ;D

As long as higher one is accurate enough to shut off when it goes over 80c it should be fine.  I think that is the main thing is the system being able to shutdown if to hot.

I know I had a S3 I think it was where 1 had temp other did not even have it.  I checked with support they where happy with just 1 as it should shut down the system if to hot. 

So perfect sensors... probley not.  But accurate enough to shutdown if it's going to hot yes it should be.