The PSU may only have 5 sata ports but the cable you connect to that port will have 3 sata connections.  So you can connect more than one riser per sata connection.  Only connect two cards per sata port.

I am under the impression there may be more than one bios setting that works so I can only tell you what I have.  I just copied it from my previous post since I am feeling lazy lol. 


"First thing I did was the bios update to 810 then enable '4G decoding'.  I started the bios setting at gen2 for all without success and then gen1 for all without any success.  I then tried leaving everything on auto and just setting the pcie configuration on gen1 and all seven cards were recognized.  After all the video cards were seen, I didn't try adjusting the setting at all.  It took a weekend to get my rig up and running I didn't want to test to see if there were gains to be made from setting anything on gen1 or gen2. 

I am also using the blue 006C version.  Odd thing is the first eight I ordered from Amazon came with the little tabs that lock the riser on the card but the second time I ordered it, it came without the tabs but seems to fit much tighter on the card.  They are both working fine though.  I ordered the second set thinking it was the risers that was causing the original problem but that wasn't it.

On a side note my two MSI Armor Geforce GTX 1070 OC Edition 8GB seems to run the hottest at 60-64 degrees.  Others are in the 50-55 range." 


I currently have two rigs.  Both using same hardware with the only difference being 8 cards on one rig and the 6 cards on the other.  All 14 cards are GTX 1070.  Same bios settings and not powering the m.2 adapter on the rig with 8 cards.  I didn't see a need for it as power is being provided to the riser and the gpu. 

I don't mine decred but your script is wrong.  The correct syntax is on the dcr.suprnova.cc home page.  

Others are just drivers for the motherboard not a must, but a good idea to do as they are driver updates put out by Asus. 

Are you using the same cards as the other two rigs?

It sounds like you don't have above 4G decoding enabled.  Verify it's on advanced - system agent (sa) configuration - above 4G decoding in bios.  Updating the drivers is probably a good idea as well for LAN, Chipset, SATA, and VGA.

https://www.asus.com/us/Motherboards/PRIME-Z270-P/HelpDesk_Download/

It would help to isolate driver issues.  The OP mentioned this is his third Z270-AR board.  Is it running the same vid cards and OS? 

If you plug the vid card directly in and it works, then it's not the mobo, power supply, OS or driver.  You are only left with how everything is connected with the riser (everything seated correctly).  Have you tried  just one video card with the riser?  Try resetting the mobo to factory and plug in just one video card with the riser.  It won't matter if 4g encoding is on or not with one card.  The point is to get one working to rule out what you can before complicating it with multiple cards.

Plug in one card to one of the 16x slots to see if the computer sees it.  Now test the other 16x slot with the same card.  If both slots work with one video card then most likely it's not a faulty slot on the mobo.

I received my 8th card yesterday and popped it in, turned on the computer and everything is all good.  Bios version 0810, 006c risers, generic M.2 pcie converters and ssd running Windows 10 Pro.  I did install the latest drivers from Asus for LAN, VGA, and I think chipset.  I left audio alone as it's disabled.  I am not sure if the driver updates are a must or not but I figured it couldn't hurt.

First thing I did was the bios update to 810 then enable '4G decoding'.  I started the bios setting at gen2 for all without success and then gen1 for all without any success.  I then tried leaving everything on auto and just setting the pcie configuration on gen1 and all seven cards were recognized.  After all the video cards were seen, I didn't try adjusting the setting at all.  It took a weekend to get my rig up and running I didn't want to test to see if there were gains to be made from setting anything on gen1 or gen2.  

I am also using the blue 006C version.  Odd thing is the first eight I ordered from Amazon came with the little tabs that lock the riser on the card but the second time I ordered it, it came without the tabs but seems to fit much tighter on the card.  They are both working fine though.  I ordered the second set thinking it was the risers that was causing the original problem but that wasn't it.

On a side note my two MSI Armor Geforce GTX 1070 OC Edition 8GB seems to run the hottest at 60-64 degrees.  Others are in the 50-55 range.  

I currently have 7 gtx 1070 running and am just waiting on the 8th card to arrive.  Thanks to those who posted on this thread as I read all of it before getting my rig to run last weekend!

It's currently using two evga cards, two msi cards, two zotac cards and one asus card (with another asus card coming).  It just sort of worked out in pairs as I purchase four cards used and four cards new from Amazon.

915 Watts.  Less than I expected.




Just need to make sure everything is stable before doing some cable managing.