3 more arrived today and all work perfectly thanks much. one question, is it OK to power some of the risers with power from the 2nd PSU? i've heard this can burn things out but can you confirm before I try this? thanks
Why would that "burn things out" I've got a customer who has a stack of power supplies running the same rig. I like to make sure that the risers are powered by the same psu as the motherboard, because they need to reset when the computer resets. You can always use one of my new dual psu adapters now to turn them both off at the same time.
On my big racks, I leave the pcie power lines always on, and just reset the little power supplies in each computer which also feed the 5v to the riser cards.