My "brand new" S5 v1.91 is here, including a nice 80+ Gold PSU for my 1.3 to bring those consumption numbers down. I'll poke around with this and get some numbers on my 1.91.
Its very interesting to "poke around" i have 1.1, 1.3, 1.5 and 1.9 and 1.91 mixed in 4 S5 and oddly enough, i have no idea why, but they all cap at 393.75hz on high quality PSU, 375hz on lesser psu (Like gold raidmax)...
Except the 1.9, that one do 400hz with no HW, getting 1.32TH/s while all the other cap at 1.29~TH/s. I don't get it. And i suspect i could push it a bit further but i'll wait a little for the motivation to do further voltage testings. I dont get it because its not the PSU having higher voltage itself. When i swap PSU used by 2 S5, they still get the same hashrate/HWE%.
At least i know that EVGA G2 and GS have consistent top notch clean power, same with the server PSU's i got from Quakefiend.
I'd just like to understand why the 1.9, i assume, have higher core voltage than all the others. It is my only guess as to why it is stable at higher OC.