HDplex 250w do not have load balancing, so their outputs should never be paralleled into a gpu's pci cables. The sync function is simply a relay of ps_on signal to boot up the second one at the same time. They do not communicate voltage or load with each other in any way. What you could do though is use a molex pin remover and remove one of the adapter's 8-pin inputs and replace it with an 8-pin EPS housing (which has 1 less GND so have to daisy chain one of the Sense wires). Then a single 250w gan could just power the 12vhpwr
Thanks, this is helpful. I figured it would make sense to dedicate one 250W to the GPU.
In the case of a single 500W unit, I'm thinking if the CPU has only moderate power requirements (e.g. 100W), it would be possible to use two of the CPU connector pins and the SATA 12v pin for the 12VHPWR like this diagram:
My understanding is there could be a few different scenarios, but I think they should all work:
- The motherboard has only a 4-pin CPU EPS input. Easy: just use a 4-pin CPU power cable.
- The motherboard has an 8-pin CPU EPS input, but will allow just a 4-pin connector to be plugged in. Also easy.
- The motherboard has an 8-pin CPU EPS input, but requires an 8-pin connection. I see some 4-pin to 8-pin CPU adapter cables online which might be questionable, but I think this should probably be okay as long as the CPU doesn't require much power.
I think in this scenario, I'd be using a <37mm low profile CPU cooler so there's no way the CPU would be drawing much load.