Batch 6 WILL be worse efficiency, as they're running it at a higher voltage. My best guess is more like 0.3W/GH vs the 0.25 spec on the earlier batches.
not true but could be true.
my batch 2 is a stud and the boards read 575 freq.
my batch 1 sucks
I will post photos.
the batch 1 does 4760 at freq 593---errors are 0.0141%
the batch 2 does 4909 at freq 606---errors are 0.0009%
I can get better numbers if I feed hot volts :
12.1 is going into the batch two
11.94 is going into the batch one
the batch 6 may have the widest volt range of all the batches-------------- if true it has an interesting value.
a psu like this one
https://www.trcelectronics.com/ecomm/pdf/rsp1500.pdfcould allow for under volt & down clock or over volt & over clock
so buying used you won't have any idea of what you get. unless you see the gear running.
you need to see the gear and read the input volts to all 9 blade jacks to know what you are buying.
and I have done extensive testing you can not cheat on the 9 blade jacks 9 separate cables. on some psu's the dc drops a lot when you split the pcie cables. you go to 11.8 and the s-7 starts to do poorly.
So a guy can say his batch 1 sucks and gives him 4500
and the truth is his power sucks and he could do more like 4700 with better psu's
I will not buy any s-7's via resale unless I test the s-7 first.