so this is an open question and i would really appreciate some feedback. at the moment i am having some power issues with my psu and my vega 64, basically running at peak use. i was wondering if i could fit an hdplex 160w in along side the sfx psu and only have the sfx power the gpu. is that possible and will it fit? i was also looking at the nano psus but they don't have an 8 pin cpu.
so your under powered psu is causing problems with your gpu? and now you want to attempt to power a card that calls for a 750w with a stand alone 160w?! just stop before you kill anything and get a proper sized psu.
PS this is exactly what I've been saying USE THE RECOMMENDED PSU! YOU DO NOT KNOW BETTER THAN THE PEOPLE THAT MADE IT!!!!
His idea was actually to use the hd-plex to power the motherboard and CPU from those 160W and dedicate SFX to GPU.
This might work, but it means buying hd-plex, an external power brick and a new riser on top of that, the one that gets power from a molex or something like that because you should power the slot with the PSU that is powering the card. Getting such riser might be tricky because such problem exists generally in mining riggs where you connect the GPUs through pci-e x1 risers.
I think that this is doable, but it'll be more expensive than getting a proper SFX PSU in the first place.
Btw for others thinking about vega 64 - not recommended because of power draw and thermals