Looking at the manual for the Maxrevo 1500 the OCP is stated as 40-50A per 12V rail. It is possible to trip the OCP with the available PCIe/EPS modular section alone as it uses only 4 of the 6 available 12V rails.
I would say that at most you could attach 4 boxes from the Neptune to this section of the PSU. Anymore and it could trip on rails 3 or 5. Sourcing more power would mean a custom adapter getting the power from rail 1 and or 2 on the MB section.
Finaly managed to get 3 boxes working out of the batch I had and now seem to find the following issues:
Lots of errors like
[2014-06-25 06:49:08] KnC: 3.0.310 Failed to setwork (19)
[2014-06-25 06:49:08] KnC: 3.0.311 Failed to setwork (19)
[2014-06-25 06:49:08] KnC: 3.0.312 Failed to setwork (19)
[2014-06-25 06:49:08] KnC: 3.0.313 Failed to setwork (19)
[2014-06-25 06:49:08] KnC: 3.0.314 Failed to setwork (19)
[2014-06-25 06:49:08] KnC: 3.0.315 Failed to setwork (19)
[2014-06-25 06:49:08] KnC: 3.0.316 Failed to setwork (19)
And hashrate drops to almost 400Ghash when running into a lot of hardware errors.
[2014-06-25 06:50:01] KnC: 1.0.344 disabled for 300 seconds due to repeated hardware errors
[2014-06-25 06:50:01] KnC: 1.0.349 Failed to setwork (99)
[2014-06-25 06:50:01] KnC: 1.0.349 disabled for 300 seconds due to repeated hardware errors
http://i.imgur.com/kaM0Kj9.png[/img]
http://i.imgur.com/tMAoPjE.png[/img]
Another thing I noticed is that these boxes seriously overload a multirail power supply on startup and causes the power supply to shut down even with enermax 1500W power supplies.
Already send in a report with KNC awaiting their response.
Very unhappy at this point