Topic: Bitmain S5 Replacement Fan (Read 4667 times)

Try to update a firmware. Here at my work an S5 was running with no fans connected to the I/O board at all (2 fans were connected over MOLEX to 3pin adapters directly to PSU).

But as soon as I disconnect the stock fan it starts beeping. What can I do?

Did you read about a page back when we talking about Static Pressure?

Open case? closed case? Push/Push? Pull/Pull??? Push/Pull?

New fans came - did various testing. In all scenario's, with a good push fan (160cfm min), adding a pull fan only lowers temps 1-2C.

In my opinion the key to have a cooler s5 with other fans is how thick they are. If you have notice the stock fan is very thick. This has the result to pull out more hot air and very fast. I dont think anyone will see low temp with any other thin fan.

My 3rd number there is just two fans in push/pull - the spacers are just small fan cutouts that make it so there is some sealed space between the fan and the case, for better airflow.  I tried the push/pull with the case, but the results were marginal so I didn't even bother recording it.

I also tried pull only without a case, but that under performed push only - both don't cool the opposite side nearly as well, but push was less bad.  

As far as partial enclosure, I first tried a sealing up the top and bottom of the heat sink - not quite as fancy as the 3D printed on that someone else did (which looks awesome).  The affect on temps was like 1c lower, whereas when you enclose the sides it makes a much larger difference.  The way I made my top, it rests on the top of the PCB's, so it effectively seals off the heat sink channel as well.

You're using 2 Ultra Kaze's per S5? What are your temps like?

Have you tested pull-only with the open case? That was one thing I wanted to test but didn't get a chance to. I wonder if it would cool better than push.

55 degrees Celsius in the room where it is 22 degrees or less.
but even if they increased the room temperature at 30 is really not more than 65 on S5.

On the type of screws, the fans are these (pick whatever length you want, this is what I use with a spacer):

http://[Suspicious link removed]/1FLWefa

and FWIW, these are what the rest of the case are:

http://[Suspicious link removed]/1AYeera

As far as temps - the first and easiest thing to do is add a spacer between both the push and pull fans and the case - doing this dropped my temps by about 2c.

As far as enclosure, I made one this weekend that is very nice on my laser cutter, and did a bunch of testing with my thermal camera to see how it changed temperatures, etc - and I will tell you that it won't drop your temperatures anything really in the standard configuration.  What you do gain are some alternative configs - so for instance, when you look at the thermal characteristics of the board when running, the front (where the fan is) is substantially cooler than the back - which makes sense, the front is getting fresh cool air, while the back just gets what it gets.  When you tweak it to push/pull, then it gets better overall, since the case is so open the rear fan sucks in fresh air from all the gaps in the case.  If you put it in a full enclosure though, now you might see better indicated temperature from their onboard sensor due to better airflow - but the overall board temps go up slightly.  I also found that push/pull becomes far less effective in this case, and actually found pull-only to be better than push-only... This has the added bonus of making the intake exposed, so easier to clean the grill and stop debris from building up (that I've seen on several used S5's I've purchased).  I'll be posting a thread at some point in the next few days with a bunch of pictures for anyone else who is interested. 

I should also say I'm doing all my testing using the Ultra Kaze:

http://[Suspicious link removed]/1cH0rta

My fan of choice for the S5 - I think it's a good balance between noise and airflow, and I prefer an always on fan than a PWM-controlled fan.  That's not to say this fan is even remotely close to the performance of the stock fan - they're hard to beat, or more accurately, I haven't been able to beat them yet.