ordered 1 S1s on 1/15/2014, second on 1/18/2014.
both arrived today.
one has 1 Xed chip. second has 2 Xed chips.
neither is reaching 180. emailed bitmain. waiting for a response.
Most of he time you get xs is when they are not getting enough power
So make sure your power supplies are good
Just to test try powering the main blade only, that's the one with the small circuit board where the network cable goes in
Of you full os, then it's probably a power issue
An x doesn't mean the chip is bad
I've gotten a lot of xs on various different chips
Most times the hashing is steady around 180
Even though a few chips have xs
reboots don't fix it, Unplug it from power for 30 seconds and power it up again
Also if you cool them too much you get xs
Ideally 47-48c is perfect
What this guy says. Of my 100+, I have yet to have one with even one bad chip, so 2 in a row with problems makes me think PSU