I am building a dedicated rig just for UFO mining. Thinking of getting 5 x R9 280x cards and using 2 750W PSU bridged with the Add2PSU. The motherboard will have space for 7 PCIE cards, 4GB of ram and a intel celeron processor. What do you think?
TWO 750 PSU's are not gonna be enough power for 5 280x's and the rig, 5x280X along is 1500watts especially if you push them to the max, then you have to factor in 100-200 watts for your system
I have read many threads that they are using 5 x 280x with 2 Rosewill 750 80 Gold PSUs, with undervolted cards of course, I don't want them running at max because of temps. But I understand what you are saying I don't want them running on the limit of W there.
But as a precaution can I put together 3 x 750 W PSU with the add2PSU? So maybe I can add a 6th card to the rig? Thanks for the help.
your need little fix to this setup
you will have problems to connect 2 psu to 5 cards and motherboard, you run out of molexies
3x550w psu will work but 3x600w to be sure
my rig2 has now 1x550w 80 gold psu, 2x280x + motherboard supply
rig1 has 3X280w psu, 1 for morhearboard, 1 for each gpu
all gpus undervolted, else you will damage wires
if you wish you can make it cheap, use 6x300w psus, 1 for motherboard, 1 for each gpu
if it is build correctly you have no problems.
there is some tricks to be done when multi psu setup. else you will kill your cards
Another thing to watch out for is using Molex to PCIE power adapters, the molex rail is intended for a different type of power draw then the PCIE power connector and could potentially cause problems, read into this alittle more, 3x750 would work, be somewhat overkill but that is better then killing off some of your gear, also with 3x750 you would be fine adding a 6th
lol
