So if there is no link for batch 4 firmware where did you find the info?

Frankly if the batch 4 does this but also  does the volts a bit lower and efficiency goes from 0.100 watts  to .085 watts I would not mind it at all.

BTW  this matches my guess that the antminer psu is a tiny bit short for the s-9.

yeah and based on some reports about early batches and under clocks working I think the gear was a ting bit too hard on the

[antimatter < fuck you spell check]


antminer  psu's .   I had the feeling they would need to slow the clocks up based on heat from summer mining and the psu being rated a bit higher then it really is.

I think they work if it is not too hot and all my guesses on this are antecdotial  not backed up by any good tests at all.

The best I have is antminer reduced the draw on the miners from batch 1 to batch 2 and batch 3.  
 I never owned an antminer psu but they spec to  the charts below






now look at the scale they put it is very deceptive the oval covers 30c the rectangle covers 10 c

the psu drops a ton of amps  in that 10c range the angle is shown far less steep due to the scaling they put.  that drop off is a lot and very steep not my graphs these are bitmaintech's graphs.  Please remember how the psu would fail in the s-2  as it was a 1000 watt psu and should have been a 1200 watt psu.

don't worry we are friends not an issue.  I put in my biggest two reasons after you posted.

 the graphs on bitmaintech are right above  that drop in amps is hidden by the scale  the 10 c it takes to drop is  2 spaces   and should be   ⅓ of 1 space .  so my guess is mostly based on those graphs and the fact that the s-2 had a 1000 watt psu and it needs a 1200 watt psu.

I have never owned or tested the antminer psu.---Fact
You own and tested it  and it works ------------------------Fact
No long term tests have been done on a batch 1 s-9 at 650 freq --------- Fact


Long term is 30 days - not a fact but what I use to define long term as  I have had psu's start to fail at the 30 day marked when pushed hard 24/7


The graphs show if it gets hot it drops. ------------------------------------------------------ Fact
The graphs are scaled to make you think the drop off is 6x less steep then it is. --------- Fact
The s-2 had a 1000 watt psu that failed often  ---------------------------------------------- Fact

These are what we have as facts.

What it means is ?

What I would do is keep my eyes open if I had antminer psus. powering batch 1 ,2,3

if indeed the batch 4 scales back to freq 550 the issue may be a mute point.

Obviously when somebody actually receives a Batch 4 S9, they could post what the default operating frequency is, and possibly the firmware identifying info (if it can be inspected).