Custom sleeving and cables

LEGEND · July 4, 2013

So I'm planning a new build soon with a seasonic 860w and 2 780s. And going to sleeve and make custom cables. Just wondering if I can y-split my pcie cables to reduce cable clutter. ie so I have 1 pcie 8pin and 1 6pin coming out from my PSU then both spliting into 2 to each of my 780s.

Morfy · July 4, 2013

NO! you will fry your card/PSU/ it won't work. Each cable provides an amount of current, needed by the card, that's why it uses 4 sets of cables/connectors for 2 cards, that's their power draw. If they needed 300w, and you gave them half? The psu is single rail, but i don't know, this seems fishy...

RicebowlDavid · July 5, 2013

Don't do it you will overload you cables and they will burst on fire, each set cable can only take a certain amount of current and combining two cables worth of power into one is likely to overload the cables.

Inside the psu is a central solder point for a +12v, +5, etc. if you had thicker cable soldered to this point i don't see why you couldn't do it.

The 780 TDP is 250 w, since a 8 pin pcie can supply 150w and a 6 pin can supply 75w, plus the pci slot can supply 75w, its a total of 300w the card can use so if you split the 6 and 8 pin you supply a total 187w to the card and thats not enough.