PSU question

[spartan11]

Sorry this is very complicated to me, I greatly appreciate any guidance here. I have a couple questions regarding a mining rig I am in the process of putting together.

First off, I have:

-EVGA 850 G2 (has 4 "VGA" outputs")

-Also bought Corsair rm850i (but I dont think this will work, I will explain later, I can return this if needed)

-MSI z170A krait gaming 3x motherboard (7 PCI slots, combination of PCI 3.0 slots: x16, x1, x1, x1, x8, x1, x4)

-GTX 1080 EVGA FTW (requires two 8 pins) -GTX 1070 8 gb EVGA FTW (requires two 8 pins)

-GTX 1070 8 gb EVGA FTW (requires two 8 pins) -Rx 580 8 gb Sapphire nitro (requires one 8 pin and one 6 pin)

-Rx 470 4 gb sapphire (requires one 6 pin) -Rx 580 8 gb Powercolor (requires one 8 pin) -I have several PCI 1x to 16x powered risers (right now I have 3 but I can order more)

First question: 1) I bought this dual PSU adapter, Raidmax 24 Pin 2 Way Dual PSU Adapter Cable - Control two PSUs with one button ATX Y Splitter (http://www.frys.com/product/8393337?source=google&gclid=Cj0KEQjw7dfKBRCdkKrvmfKtyeoBEiQAch0egThDFUS28vajucOei7enVnSfJR23hYwrSIXmaiXdfewaAiHQ8P8HAQ). This thing does not fit into my EVGA PSU? My motherboard PSU slot currently has a an 18 pin and a 10 pin coming out of the PSU. The corsair PSU I also bought is set up the same way. Is there any sort of adapter I can use to use both PSU? Alternatively, I can return the Corsair PSU and suck it up and just buy a 1200W PSU instead but this leads to my second question...

 

2) Any PSU I look up does not have nearly enough "VGA" ports ie the 8 pin PSU ports. Most of my cards require two 8 pin connections. Thats why I bought a second PSU in the first place. This does not even take into account the powered risers and what PSU ports I would use to power those.

 

3) Regarding powered risers, do I also need to provide power to the GPU via the VGA PSU ports? Ie if I have a powered riser hooked up via the molex cable, do I ALSO need to plug in the two 8 pin connectors if I put the 1080 or 1070 on the powered riser?

 

Thanks again if you read this far, I am new to this and really appreciate the help.

[Max_Settings]

Dude, I am honestly confused what you are doing. You have so many things wrong with this. Can you please post a solid build list please? Any 750W+ power supply will have 4 8 pin connectors for GPUs, There is no "VGA" ports on a power supply. And there is no such thing as a 18pin. Why do you have 3 different GPUs?

[Max_Settings]

Give me your budget and I will make you a build

[Max_Settings]

Also no one uses 2 PSUs, and why are you using riser cables?

[Changis]

why not buy the parts you need for a second or even third system instead?
macguyvering together two psu's is not adviced unless you are doing scrapyard wars and are out of time/money for a better psu
you'll get the added benefit of the cpu's as well and you don't have to rely on some unsafe macguyvered together solution

[0x1e]

Looks like you have old GPUs that you want to use for mining?

And you're asking about the power demands of these GPUs regarding these PSUs?

 

I would personally return the RM PSU and buy a 1200watt+ PSU. Not because of the power needs, but because it gives almost double the VGA ports.

You'll then have the 1200+ running 75% of the build.

 

The powered riser cards will only power what the motherboard was originally supposed to power. It will not replace the 6 or 8 pin power. You must use all of them.

The reason for a powered riser card is to remove the motherboard from powering the GPU, as you'll have 6 GPUs which will pull around 450 watts from just the motherboard. The riser cards will remove that power need, but it will not add more than what was already supposed to be there. Stops you from melting your atx power.

 

The Y connector should be universal. What do you mean it doesn't fit?