low hashing s5

[nevillebartos]

Got at least 1 s5 and possibly 2 giving me a headache.  These 2 units dropped in speed before eventually just going offline.  I brought them home for testing, one seems to run fine but the other I can't get above 600GH/s.  To get the speed up I had to downclock.  They both appear to be operating but I suspect I'll be able to narrow it down to one board.  PSU is confirmed to operate normally.  Am I just going to have to ditch malfunctioning boards?  Anything else I can do besides checking cables and PSU?

[notlist3d]

I would try the following guides from zendesk:

https://bitmain.zendesk.com/hc/en-us/articles/204875015-How-to-diagnose-S5-hashing-PCB

Then

https://bitmain.zendesk.com/hc/en-us/articles/203559969-My-S5-hashes-at-about-600GH-S

Can you post a status picture is it seeing both hashing modules on S5?  And what PSU are you using (model and watts)?

[nevillebartos]

I would try the following guides from zendesk:

https://bitmain.zendesk.com/hc/en-us/articles/204875015-How-to-diagnose-S5-hashing-PCB

Then

https://bitmain.zendesk.com/hc/en-us/articles/203559969-My-S5-hashes-at-about-600GH-S

Can you post a status picture is it seeing both hashing modules on S5?  And what PSU are you using (model and watts)?

Thanks for those, I'll rig em up again in the morning and post a picture, but it was seeing both boards and giving temp data etc..  I'm using the bitmain PSU.  Firmware is good, but if I run any higher than 200 I see a decrease in hashing, temps don't suggest this is a heatsink / thermal compound issue, seeing about 40c and it's bloody hot ambient today