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Eight (8) GPU Mining Rig using ASROCK Z270 Killer SLI


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I've been posting about this motherboard for a while now.  My research project with this board is now complete!  I have 8 GPU's running on it; Two via M.2 adapters and 6 via PCI Extenders.  Video out to monitor is also routed via the onboard GPU.  Here is the original post.



I was able to get 7 NVIDIA cards running via this original rig.  I can happily say that I'm running 8 AMD Radeon cards on my second attempt.  My guess is that I would have been able to get the 8th card up and running on this original build had I given it more effort.  I tried once and a lot of the cards dropped off so I backed out and got it back up and running.  I think in my install I nudged a few PCIE extenders and should have just reseat them all and tried again.  The M.2 adapters can also be touchy and it sometimes takes several attempts to get them to see the GPU.  I sold that rig so cannot try it again.


I liked the motherboard so much and it is at such a good price point I bought another one.  I also loaded up on RX550 cards in order to do a "CryptoNight Mining Rig" build.

Parts List

Motherboard - The ASROck Z270 LGA 1151 - https://www.newegg.com/Product/Product.aspx?Item=N82E16813157746&Tpk=N82E16813157746  Here is why.  Six PCIE slots.  Two M.2 Slots.  This allows a total of 8 GPU's.  It also will do onboard video so the GPU does nothing but mine.

Screen Shot 2018-01-18 at 1.20.37 PM.png


Stick O' Ram * 2 https://www.newegg.com/Product/Product.aspx?Item=N82E16820313741&Tpk=N82E16820313741

Cheapest CPU you can find - https://www.newegg.com/Product/Product.aspx?Item=9SIA1K66RA3156&ignorebbr=1  The box is going to be a GPU miner, not a CPU beast.


UBIT Risers


PCIE Risers - https://amzn.to/2GcDvBG

Screen Shot 2018-03-25 at 12.22.24 PM.png


M.2 Riser


Screen Shot 2018-01-18 at 1.27.36 PM.png


Now, the secret sauce. http://amzn.to/2EVMx5j  This little jewel will convert your M.2 slot into a PCIE slot.  You still need the riser board though.  When you populate the M.2 slot it will also consume a SATA connector.  Not physically so check your motherboard manual.


Other Small Parts

Power Switch / Reset Switch - http://amzn.to/2riG0zJ

I already have this for the power supply - CRJ 24-Pin ATX Red LED Power On/Off Switch Jumper Bridge Cable, Black Sleeved 22" - http://amzn.to/2Dh9XBA

You can also use this - http://amzn.to/2DglvFd - to link your two power supplies together and they will turn on at the same time.




IMG_20180318_145424.jpgI enjoy building the frames and did another custom build.  I took a lot of time with a tape measure and the gear plus the cable lengths.  I wanted to center a motherboard between two power supplies and have two racks of cards.  I also wanted it wide enough in case I switched to a B250 board that would run more than 8 GPU's.IMG_20180318_143452.jpg


I gave it a coat of flat black paint.  I took a little extra time with it and covered nail gun holes and wood flaws, sanded, then painted.  Some screws are still visible because I couldn't find my counter-sink bit!  I also thought I was being cool by using some hickory we had left over from a flooring install.  It's so freaking hard of a wood that it was tough to work with! I won't do that again but this rig has some very sturdy cross members!  My only oops is I have twice neglected the SSD mount.  I don't have a real custom way to mount it. Lastly, I put in a swivel board on each end to hold in the power supply.  You will see that in another photo.


I still follow my own advice on Windows 10 Prep.


Read this post, do the steps.  I have also learned to install TeamViewer right after Windows Loads. Don't wait!




The lowly AMD Radeon RX 550 with 2Gb of onboard VRAM. Who in their right mind with mine with one of these cards?


I like the RX 550 2Gb card.  I personally like the Gigabyte version. They don't require external power and I've found them to have decent VRAM in which to mod the bios and overclock.  I've purchased them new anywhere from $95 to $130.  The produce around 420 H/s on XMR-Stak and more with aggressive overcloccking.IMG_20180322_231827.jpg


They also sip the power.  Here i have the rig of 8 on a single 750 watt power supply even though I have two power supplies loaded up on the rig.  One thing I have also learned is that you don't have to apply power to the 4 pin plug on the M.2 adapter.  Powering the riser is enough.

That's the rig.IMG_20180322_231838.jpg


You can see the while M.2 adapters in there somewhere!



Here is a beautiful picture.  8 GPU's in Device Manager. IMG_20180322_232002.jpg


Photos or it didn't happen.  Above is XMR-Stak detecting the GPU's.




Here are the threads, two each per card.



Another pretty sight.




Claymore Miner

Screen Shot 2018-03-25 at 1.11.21 PM.png


They are not Vega's.  They don't hash like a Vega but they don't cost like a Vega.  Not a bad rig.  Cost per hash is much lower than many other AMD cards on the market.  Do the math for yourself if you are curious.  Hit me with questions.


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  • 2 weeks later...

I see you taking mining very seriously. Very nice project. If you don't mind to ask what was your total cost? Have you actually cashed out from mining.

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  • 1 month later...

Hey @alex1002, apologies for the late reply.  This rig goes anywhere from $1300 to $1500 in parts depending on when you buy.  I have not checked the prices in a few weeks so do your own work there.

I have sold all my rigs and have stopped mining for the time being.  I got out at a good time with profit from the rigs and profit from mining.  I still own a single RX550 and a 1060.  I'll use the 1060 to game with in the future so keeping that one.  I need to put the RX550 on eBay as I don't have much use for it any more.  I was using it and the 1060 to mine MSR after the fork in order to get my pool balance over the limit so it would transfer to my wallet.  


Someone was asking about the PCIE spacing on this motherboard and I have had zero issues with it.  If you get one of the mobo's that have many x1 slots side by side, then yes, there are issues.  You will need to use electricians tape to wrap your x1 riser board so they don't come into contact with the adjacent riser.

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