I have receveid my rockminer in one week but
- led blue statut  never work or work 5 sec sometme and stop for a few time
- mining a 50/60 ghs max (i have tested all frequence to 270 at 350 but it fixed at 55 - 60 ghs)

i have tested on w7 with cgminer all version and zdig ok

and now on linux distro ubuntu with cgminer and the problem is same
the temps is 37 to 40 c°

is the material is hs ?

the power supply is a corsair 500 w 6 pin

 have yous a idea ?

it seems that the internal weld is not top, the mini USB connector is very fragile and can be easily desoldering . I think that there is a big worry manufacturing with full manufacturing defects