Need HELP for setting up Mining Rig with asrock h81 R 2.0 mobo

[pyoc70]

Hi Friends
I need help to build my new Mining Rig on Asrock h81 R2.0 with windows 10

Hardwear I have:
Asrock h81 R2.0 Mobo needs 4th generation i3 , i5, i7 processor which is best for 6 gpu ?
Rx 570 4 gb
Rx 470 8 GB 2 cards
Rx 470 4 gb Mining edition 3 cards
Rx 480 8 GB ( but it doesn't have bios switch nor the led light )
8 GB ram DDR3 x 2
Psu cooler master 850w and corseior 550 w
SSD 120 GB
Risers
1x to 4 x pcie expander card


I want to know
Which cpu will be better for my rig ?
Best Psu for 6 Rx 470 cards ?
Type of best power Riser molex or sata connectors ? I have sata and 6 pin connector Risers
How to setup  1x to 4x expander card? On 1x slot or on 16 x slot ? Any more I have to modify motherboard bios ?can I mount more than 6 gpu on asrock h81 r2.0 using 1x to 4x pcie expander card ?
Do I will face any problem using Pentium for 6 or more GPUs ?

Also need more advice to setup motherboard bios and any more settings related to asrock h 81 r2.0 motherboard

[ruthbabe]

For a start-up, building a mining rig to mine crypto-coins could be a daunting task, especially if you don't know yet what mining type you're up to. If you're building an Ethereum mining rig I think this guide, How to build an Ethereum mining rig surely would help you.

Or, you may want to try this AMD 6GPU Rig Build Wizard, https://www.buriedone.com/amd-6-rx-470-570-build.html

Wish you luck.

[jillscarbrough]

Based on my experience with those motherboards. 

Processor
If you plan to use 4th Gen i3,i5,i7 it would be better, but G series (I'm using G3260) it's more than enough for me.

RAM
4GB it's enough, 8GB would be better, 2 x 8Gb Excellent, but overkill.

PSUs
Single 1200 Watt PSU seems safer, cause we need power spare to keep our devices in a good condition. Remember, mining for long terms. But you have prepared your PSU, double PSU 850+550, and it would be more than enough, pay more attention to powering scheme.

Riser Power Connectors
Molex and 6Pins safer that SATA (from how much power that can be handling), but isn't mean that SATA un-useless. If you are using SATA, make sure limit it to max two2 Riser powered by one rail SATA connector, would be better one Riser on every one SATA rail connector.

1x to 4x expander card
Personally, I didn't recommend for using 1x to 4x expander card. Would be giving you more trouble.

Do I will face any problem using Pentium for 6 or more GPUs ?
As long as you following all of the essential rules (Giving enough power, a right powering scheme, picking a right driver..etc), You'll go smoothly.

[bicepsmctouchdown]

I have that setup.  I thought about adding more than 6 gpus to it and the one posts I found of people that did it used a expander for one extra.

I am running a 1200 Platinum and have never pulled more than 860W on it (that I see in on my kilowatt). 

 I did a linux build and am doing a windows 10 one now.  I started by connecting one to the mother board at the 1X16 slot loading the drivers powering down and then pulling the GPU out and attaching to a riser then boot.  Monkey with the bios settings PCIE speeds until it is recognized then keep adding them one by one til you are done.

I had a bad experience connecting molex to the motherboard (like the bios tells you when it flashes that screen written in english and chinese).   If you are using powered risers you do not have to use them especially you turn off all the components you won't be using in the bios that would require extra power. 

As for risrers,  buy 2x as many as you think you need.  Some are crap, others fail, and it is good to have extras on hand.
I liked the risers that had a molex connector on them which I used 2 per cable and then for the last two I used the extra CPU2 slot on my PSU to connect to a dual 6 pin splitter which fed my last 2 risers.  Just follow the best practices about not overloading your cables that feed the risers and you should be ok.

When I booted into windows I had sluggish performance and could not figure out why.  For some reason the chipset drivers for that board were not on the website (that I could see) and I had to go to the device manager and have windows fetch them.  So remember to do that once you get it running.

[jillscarbrough]

I am running a 1200 Platinum and have never pulled more than 860W on it (that I see in on my kilowatt). 

Seems like overkill, but you are in a safe zone. Especially if you need to add another part that requires power from motherboard sockets such as a fan or whatever.

I had a bad experience connecting molex to the motherboard (like the bios tells you when it flashes that screen written in english and chinese).   If you are using powered risers you do not have to use them especially you turn off all the components you won't be using in the bios that would require extra power. 

What kind of bad experience that you got with those two Molex connectors? Melted? Or may can't boot to the system? That motherboard requires that additional power from two Molex connectors if we plug more than three cards on it. I have done that before, plugging six cards without that two extra Molex power, seems no problems, I think it because those all card is RX series. But, I want to keep on rules, PCIe 1X would delivering max 25 W in a normal condition. That's why that motherboard was adding two extra Molex power.

And the other thing, I agree with you.