Antminer S9 back fan cable melting

[tim-bc]

Why would the S9's back fan cable be so much more prone to melting than the front cable? Is it because it comes in contact with the frame which can get very hot? It has only become more of an issue lately.

https://i.stack.imgur.com/MLGOg.jpg

[1713266154]

1713266154

[Raymond_B]

Why would the S9's back fan cable be so much more prone to melting than the front cable? Is it because it comes in contact with the frame which can get very hot? It has only become more of an issue lately.

https://i.stack.imgur.com/MLGOg.jpg

Wow, how hot is that miner getting? Mine are running in 90F ambient air and I do not see anything like that.

[tim-bc]

Wow, how hot is that miner getting? Mine are running in 90F ambient air and I do not see anything like that.

I don't know about that one specifically but during the day the cold aisles (ambient air) are around 40c and the hot aisles (exhaust air) are around 60c. So, cold = 104F and hot = 140F approximately.

Also the miners are prevented from hashing with any local temp above 100c and any chip temp above 147c.

[fanatic26]

104f ambient intake temps? How do your machines even run?

[tim-bc]

104f ambient intake temps? How do your machines even run?

They run away... usually like 20-30% are in thermal protection at the hottest point of the day. It's a big dent in the hashrate, although I think the massive airflow helps.

If only they would all just grow legs and walk to northern canada

[vm1990]

you really really do need to figure a way to keep them cooler, it may sound stupid but there are a few extra options if the miners are getting that hot, stick them on a metal sheet (thicker the better to act as an extra heatsink. point a couple spare fans at the sides to turn the case itself into a extra heatsink, and last try to get the room temp down, open windows and doors and stand there wafting cool air through the room if you have to.

[tim-bc]

you really really do need to figure a way to keep them cooler, it may sound stupid but there are a few extra options if the miners are getting that hot, stick them on a metal sheet (thicker the better to act as an extra heatsink. point a couple spare fans at the sides to turn the case itself into a extra heatsink, and last try to get the room temp down, open windows and doors and stand there wafting cool air through the room if you have to.

Thanks for those suggestions. All of the miners are already on metal shelving with extra fans to ensure maximum airflow. All of the walls are louvered and the doors are open as well.