Hello everybody,
Greetings!
I am writing the reply of some one's post about the question "If I connect a gpu to a cable pcie of a psu and the riser with a cable of a different psu, can it be a problem?" which is not so much clear question eventhough I would like to try in simple and short as possible as I can.
In my guess, he would like to make a large GPU mining Rig(eg: 9 GPUs) in a single motherboard at that time he should use two Power supply Unit (PSU) for a single motherboard but safety considerations and procedures should follow for the best result like better to use good quality PSU and should use T2PSU adapter of high quality which connects the two PSU in series with the motherboard simultaneously.It does not matter you can use PSU of two different power capacities.At this situation no problem you can do it.I hope you understand.Thank you.
Depending on the GPUs and their power consumption you have several options.
The Asus board mentioned above works, so does the Colorful b250 pro mining board with dual 24 pin PSU connections on the board.
Add2PSU is also an option.
Best would be to get a cheap small PSU for the motherboard and a server PSU like is used for ASICs. Get the PSU and a breakout board for your 6/8 pin PCIe cables. Depending on your GPUs you will need to use 2-3 per card. Breakout boards have varying numbers of PCIe outputs, common to have 22. This allows you to do 7 cards if it is 3/card. If you need to get to 9 cards just use a main PSU that gives you enough to run two more cards and the motherboard. If you are using lower power cards with a single 6 or 8 pin PCIe then run 11 from the server PSU and 1 from the main PSU.