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This review is for the All in One motherboard, cpu, ram combo with a dual slot PCIE card footprint.
Introducing REBTECH 8GPU-MB powered by an AMD A6-8500
https://i.imgur.com/4z057eh.jpg

Full Specs:
CPU/APU               : AMD A6-8500P FP4 SOC , Radeon R5 Embedded Graphics 15W TDP , 1.6Ghz , 1MB L2 Cache , 4 Cores
Memory                : 4GB SO-DIMM DDR3
Storage support     : mSATA SSD, USB Flash Memory stick can be used
Expansion slots      : 8 x PCIex via USB3.0 Connectors
Networking            : LAN RJ45 10/100/1000 Controller
Video cards            : AMD & Nvidia**
Video out               : HDMI 1.4
External I/O           : 1 x USB 2.0, 2 x USB 3.0
Power                    : 12V 6-PIN pcie

Dimensions       L: 250mm, W: 40mm, H: 100mm
OS Support       Windows® 7 32/64 bit , Windows® 8.1 64 bit, Windows® 10 64 bit , Linux, SimpleMining, HiveOS, ethOS, mmpOS
Warranty               30 days

**nVidia video cards will only work without video output from the MB.
Mining RIG output can be seen only via SSH or from simplemining/hiveOS app.

I got this board primarily due to the form factor and low TDP value (~15W or lower)

Additionally, there is no need for pcie 1x to USB adapters.
It eliminates the need for ATX psus if all your GPUs are powered through server PSU.
Could provide better airflow and cable management especially if you've put the GPUs on a wire-shelf.
Costs the same as traditional motherboard, ram, cpu combo these days.

https://i.imgur.com/8SXODIf.jpg

My testing was done on MMPOS (flashed on to a USB drive) which booted just fine out of box.
I did my Nvidia cards with display output both from video card and onboard HDMI slot. Neither method worked.

So the trick is to setup whatever BIOS parameters you'd need to utilize prior to installing any Nvidia cards
In my case there was nothing that I had to change in BIOS. I just plugged 7 AMD gpus. Verified display out from onboard HDMI port.
Turned off the system. Plugged in the Nvidia card and MMPOS just booted up fine. I SSH'd into the machine and was able to mine/configure just fine.

Conclusion
In these times when the prices of PC components are exorbitant, this board is definitely worth it. The only con I see is
the warranty of 30 days in comparison to mainstream desktop parts.

well this is was nice m.2 ssd with sodim ram + integrated cpu and small form factor same size as gpu, nice usb port riser, pretty convinience, saving lot of space

where do you buy this thing? how much?

Just google Rebtech.  They have been around long time and have always interesting stuff.  Ive got a couple of these and work great. 

https://shop.rebtech.ai/product/mother_board/
It costs $145+$30 DHL shipping.

Also, when I did a search they had these kind of boards since 2015. Maybe the mining boom didn't pick it up in 2017.  The APU is old.

anyone know if there will be a bios update, so we can use nvidia?

we can use Nvidia in headless configuration. System will boot unless you've connected a display cable to the board.
I used it on a mix of AMD and Nvidia card. RTX 3000 series.

Yea, but i would like to have a monitor connected, so there is no words from rebtech about a new bios?

189+50$ now

Just SSH into it...no reason for a monitor.  None of my rigs have monitors.

I didn't know that such equipment existed.
But the habit of assembling farms on ordinary motherboards is very difficult to overcome.
In the event of a breakdown, the motherboard is usually damaged. The processor and memory remain working. And the motherboard has a 36 month warranty and it is possible to extend the warranty to 60 months.

But I would like to read the instructions for setting up this equipment with Hive OS.

Hive can be flashed onto usb using a flash tool like etcher. Right? It would be plug a USB drive and boot.

Just and update on Nvidia GPU's and RebTech 8 gpu miner.  I recently got in my second one, so I decide I would try to get the miner to work with my Nvidia 1080's and Titan XP.  Initially if a GPU was attached, it would not boot or display any video. I was frustrated to say the least.  So I started poking around in the BIOS and saw a parameter that I remember from way back could be problematical with Nvidia GPU's and how it maps Base Address Register (BAR).  Normally its not an issue with enabling 64bit BAR as most PC's have more than 4GB of RAM.  But since these boards mostly ship with 4GB that can be problematical as the board tries to map the memory above the 4GB memory boundary, just something it does.  So I disabled it and suddenly when I plugged in my Nvidia GPU I had video output from the GPU. 

So next thing was to fire up Hive OS and see if it saw my GPU and if it would mine.

https://i.imgur.com/y1QeVKq.png

On to adding more Nvidia GPU's and see if it would still boot and mine.

https://i.imgur.com/tmDFYSi.png

So here are the steps I did to get it running.

 1. Boot the Rebtech without any gpu connect via pci po
 2. When it boots to the device list, hit <ESC> key to enter the BIOS
 3. In BIOS down arrow to Setup Utility (last line in the list) and hit enter key
 4. The move to the Advanced Tab (right arrow one time)
 5. Then down one line to PCI Express Configuration and hit enter
 6. You will see 3 configurations on this screen. You want to disable 64bit Bar Support.
 7. Press F10 to save hit enter and exit.
 8.  Power off your Rebtech, and connect your Nvidia GPU to pci port 1
 9. Plug in your monitor to the Nvidia GPU, as you will no longer have video out from the miner board when a GPU is connected.
 10. Power on, boot HiveOS and configure your rig.[/li][/list]

Thanks for the info.  I have 3 of these boards but only using 2 of them so far with all 5700's.  But may put my Nvidia cards into the 3rd one soon.

WTF  ??? This kind of motherboard existed? I bet the power draw will be very limited compare to a full desktop for mining, can some drop the actual power draw (watts) of this awesome looking gadget? And also a link to where I can buy? This is impressive IMO

around 50watt, with 8gpus

Can you drop a link where I can order for one of this motherboard? Is it available on Amazon or newegg? My current motherboard draws more than 50watts when mining with just 4 graphic cards

www.rebtech.ai


Update on my working with getting Nvidia GPU's to work. 

The board ships with 4GB SO-DIMM.  Surprisingly I don't have any larger size ones, so I ordered an 8GB SO-DIMM.  I will pop it in when it gets here.  If it boots, I will re-enable the 64bit BAR Support and see if it was just the lack of RAM that is the hinderance to just being plug and play solution.

It's around 10-12w for just the board.
https://youtu.be/0l25B9cnMsg?t=543

Just want to thank you for sharing this. I'm using the board with AMD cards rn, but will save this for later.

189+50$ now
[/quote]

Out of stock. And it was RMA repaired...

It would seem they blew thru their stock and rebuild (RMA) units once people start talking about this board.  My 2nd unit I got was an RMA unit as well.  I think a lot of the RMA's were people having issues getting Nvidia cards working and just sent them back.  So technically nothing wrong, just people who were frustrated. 

Now the question is are they getting more stock?   And when.

JimS2321

I have a problem with one of mine where the 4 bottom USB PCIe ports do not get recognized.  I have to ship it back to them for repairs.  Hopefully it is something simple they can repair since they have no more stock.  If they had more stock I would get more of these boards.  I asked them about the stock and they said probably in about 2-3 months.

Well, that sucks.  But I will wait and grab one more of them, for my 4GB/6GB rig. 

Got my Rebtech 8gpu to work with windows, and nvidia, and the monitor

https://www.youtube.com/watch?v=6xvckAzkmb8 (https://www.youtube.com/watch?v=6xvckAzkmb8)

If you are a beginner, I would advise you to study a simpler and more inexpensive solution and you will not break this motherboard by incorrectly connecting the riser in the pci-e x1 connector
https://aliexpress.ru/popular/b75-motherboard-mining.html  
at $80 this is the perfect beginner kit for 12 GPU,and this motherboard has no problems with bios settings.

The REBTECH is simpler, it doesn't have PCIe_x1 slots, it uses USB connectors instead. There's no need for those flimsy PCIe adapter tabs.
I'd recommend a board that uses USB connectors for PCIe for a dedicated GPU mining rig, but one that can also accomodate a decent CPU for a hybrid rig.

On the other hand I wouldn't recommend a mining board for a newbie, I'd recommend a regular board with lots (up to 6) of PCIe slots. The newer boards
have fewer PCIe and more m.2 so I'd look for an m.2 to 4x PCIe adapter to support more GPUs if necessary.

If you lose interest in mining you can repurpose a regular motherboard. You can't do that with a dedicated mining board.

To expensive in my opinion. I pay mostly around 30 - 40€ for my mining boards. Mostly i buy normal consumer boards with enough pcie, but i also bought some Asus mining experts for 30€ or the asrock btc+ for 20€.
You have so many options - a good option is also to buy a normal board and expend the pcie slots with an pcie splitter - this works very well.

Chinese also produce nice and cheap products like this one:

Mainboard for 12 Cards connected over USB direct to the board, with an G3900 and 1 Riser for under 60€.

https://www.ebay.de/itm/225030958221?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1oJ6Z3B3bSVOT8S3bDU7nHw30&norover=1&mkevt=1&mkrid=707-134425-41852-0&mkcid=2&mkscid=101&itemid=225030958221&targetid=1716911582119&device=c&mktype=pla&googleloc=9115850&poi=&campaignid=17943303986&mkgroupid=140642150118&rlsatarget=pla-1716911582119&abcId=9301060&merchantid=115466014&gclid=CjwKCAiAu5agBhBzEiwAdiR5tKt1Jc2Tcxz3Y377IOEjHsXcz5Nt5dTVWGKmjqR_1WPTeL-n-Tpv4BoCyrkQAvD_BwE (https://www.ebay.de/itm/225030958221?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1oJ6Z3B3bSVOT8S3bDU7nHw30&norover=1&mkevt=1&mkrid=707-134425-41852-0&mkcid=2&mkscid=101&itemid=225030958221&targetid=1716911582119&device=c&mktype=pla&googleloc=9115850&poi=&campaignid=17943303986&mkgroupid=140642150118&rlsatarget=pla-1716911582119&abcId=9301060&merchantid=115466014&gclid=CjwKCAiAu5agBhBzEiwAdiR5tKt1Jc2Tcxz3Y377IOEjHsXcz5Nt5dTVWGKmjqR_1WPTeL-n-Tpv4BoCyrkQAvD_BwE)

In my opinion every Octominer or how they all called is so absolutely overpriced - for what should i pay over 1300€ for a case with a cheap motherboard? If i build an "Octominer" by myself, i only pay 30% from what octominer want.
Octominer only as example and not to spread FUD.

Do the math mates and don't spend your cashback time for your parts with senseless expensive things.

Depends on how many cards and builds you are doing. I have 13 octominers I got a discount on them. been running them for 18 months no big issues.

but I have so many mobos and cases and gpus I lose track.

Selling some gpus on ebay I have 3 1080ti's left to sell.

The b75 motherboard does not have PCIe x1 slots, they use 12 USB ports. On new motherboards, there are problems with the settings for running 6 GPUs at the same time, and newcomers have a lot of problems with this. Regular PC MOBOs with lots (up to 6) of PCIe slots are expensive. So I wrote a proven and inexpensive solution.