I'm using the GPU/CPU/RAM rails on the LEPA to power the unit. I have four PCI-e connections on rail 12V5 (three connectors powering hashing boards and one powering the controller) and two connections on each of 12V3,12V4 and 12V6. So in total there are 10 PCI-e connectors on the miner and that's how I split them up.

Haven't looked into frequency or voltage control on the miner yet. I mentioned before that I  don't plan on overclocking this unit for awhile, so I don't have any numbers on that yet. However I suspect it has at minimum frequency controls.

After mining for a few hours the outside case is as cool as when the unit is unplugged. Obviously quite a bit of warm air is blown out by the fans during operation, but case is nice and cool and hashing board temps are from 44C-49C for me with an ambient temperature of ~ 20C.