I bought 25..and Love these!
I have 24 humming at 4-5 mh/s and have been hashing at 105 Mh/s...I love these beauties.
But almost since I've gotten the latest 12..I have one that won't hash at all and one that consistently runs at 17% hardware errors.
I haven't tried to dial up the voltage on the one with the high errors...but any thoughts on the one that won't hash at all?? I've tried switching hubs and changing the Hz...but to no avail.
I'm running the whole pool at 796hz out of the box..no adjustments.
Awesome.
My experience is slow but painfull deteroriation over the last 3 months. I have 11 units, and initially all worked well on my hub.
Now I have one that refuses to be recognised by the USB driver on the hub but works well on the PC
And I have one that generate some kind of memory write error (on the hub, I have not tested it on the PC)
Initially all remaining 9 worked well on the hub, but slowly but certainly more and more start hashing at reduced speed, like 2Mh/s. It was stable for weeks no problem, and then it starts and doesn't want to go away.
I use an eyeboot 19 port hub, I even dialed up the open port voltage to 5.2V, it drops down to 4.9V under load (earlier it went from 5.05 to 4.75V). It certainly did not make it better. I know I have one bad USB slot on the hub. JStephanop wrote earlier that "eyeboot hubs are known for bad usb contacts and performance issues".
I have no idea what the problem is with my setup. I have been all clockspeeds up from 600Mhz, adjusted pots up and down, so I feel I have reasonable control. Maybe the core voltage is drifting that is possible of course. No idea.
No I have switched all off, and will take a break to figure out how to proceed. Buying a new hub is not an option, the eyeboot already cost me too much. I give it a pause before I might just start the whole lot again from scratch.