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I'm setting up a Asus B250 and I have 12 cards to add to but i got stuck at 8 (RX580's XFX).  When I add the 9th HWiNFO64 see's it and monitors it, the B250 BIOS recognises  it but Windows 10 device manager does not and nor does Afterburner (they both stop at 8  ).  I have the current version of Win 10 so the 1709 fix for this issue isn't or shouldn't be the problem.  I switched to SMOS to give that a try but it get's stuck at 4 GPU's and I can't add any more.  I have an excessive amount of power available (1 x corsair 850W and 1 x Delta 2400W) so this should not be a problem.  The rig runs well with the 8 cards at about 240 mhs with very little tweaking done but I obviously need to get these other cards up and running.  They are RX570's by the way.  Thanx in advance for any input.

Afterburner only allows 8. I believe that motherboard only allows 8 AMD as well.

yup, as far as I know you can have 8 amd + 8 nvidia cards at the same time in Win 10. Try linux.

I tried SMOS which is a Ubuntu derivative and it was worse.... only 4 GPU''s worked?  Is Claymore with Ubuntu on it's own any better? 

I think latest AMD Adrenalin drivers support more than 8 GPUs. Are you on blockchain drivers?

no I'm not familiar with that one.

From what I remember limit is 8 GPU per brand. I think it's limitation within Windows , not only within drivers. Thats why 13 card setup was so popular (8 NVIDIA +5 AMD). Maybe with new drivers you can have 8+8 but if you are looking to populate all slots you need to look for mining specific OS. Sadly can't recommmend you one, myself I never had to use one.

This is why you shouldnt run Windows as a mining OS. Its a piece of crap. Dont be lazy, run linux and profit.

Well then try the latest AMD Adrenalin drivers , they support upto 12 cards. (As long as you are not using Vega GPUs).

It's more like system limitation. Using Linux must be solving your problem (like the other said), but am not sure why you aren't able to do it with Linux. Splitting your rig will be better. With less cards, your rig will be more stable.

Does'nt need Linux. See here:

https://mining.help/2017/12/10/windows-10-mining-guide-for-amd-gpus-12-gpu-supported/

Both Windows 10 and AMD Drivers support 12 AMD cards.

Gave this a try and I was able to add a ninth card BUT when i added the 10th Claymore started throwing GPU "errors" and having to restart.  I also found the Adrenalin software PAINFULLY slow.  Did you find same?  may just be the rig set up or some thing.  Regardless, the system recognises the 10th card  but it wont mine properly.

Did you put each card in compute mode, as described in guide I linked (section Mining(Compute) Driver Mode
)?

I don’t use Adrenalin drivers as my cards are Vega56/64s and they don’t play nice with these drivers.

yes i did.  It made a difference in the hash rate but didn't change the number of cards accepted by claymore.

I see. Claymore should work. Can you try running two instances of Claymore, with one instance with first 6 cards and second with last six?

no idea if this is possible.  or how it would know which cards work with which instance?  right now with more than 9 it just crashes.

Run first instance with -G 0,1,2,3,4,5 and start another with -G 6,7,8,9 etc.

And make sure you have allocated enough Virtual Memory in Windows.

Just saw that claymore uses -di to select GPUs:

-di    GPU indexes, default is all available GPUs. For example, if you have four GPUs "-di 02" will enable only first and third GPUs (#0 and #2).
   You can also turn on/off cards in runtime with "0"..."9" keys and check current statistics with "s" key.
   For systems with more than 10 GPUs: use letters to specify indexes more than 9, for example, "a" means index 10, "b" means index 11, etc; also "a", "b", and "c" keys allow you to turn on/off GPU #10, #11 and #12 in Runtime

hu... very cool.  so I would add the -di 0 etc to the .bat file I assume?

I have the recommended amount allocated on set up (16 I believe).  Do I need to double that to run two instances or.....?  Cheers

Are you on ETH or Cryptonight?

I usually max out my VM based upon my disk size. So on one I have VM as 64GB min and 96GB max. Just max it out.

With VM maxed, try only with one instance first.

ETH.

I ran the modded .bat file and it did indeed run with the GPU's specified which was awesome but short lived.  I ran a second instance with different GPU's specified and it came up initialised and selected the right GPU's BUT when it began hashing it threw GPU errors and then stopped with the error report stating the M port was in use (I assume by the first instance).  So I guess I need to select a different M port?  and maybe the GPU error is related to VM?  I'll increase that and see if it helps.

Same problem here with my B250 Mining Expert -> 8x RX 570 it's ok, as soon i put another one, i got instability on the rig, every mining program stop in a minute or two.

I don't know why, but now on this machine Rig, even add NVIDIA don't work anymore

With Win10 Creator Fall edition, and 2x1600W PSU

My issue above started out that way but it was suggested that I update to the AMD Adrenaline drivers and that allowed me to add more cards but mining still stops when I go from 9 to 10.  I'm going to try the above later today and will let you know how it goes!  Maybe try Adrenaline and see if that works for you?
 

Just saw in Claymore ETH thread that it supports upto 32 cards. So you should need only one instance.

https://bitcointalk.org/index.php?topic=1433925.0

So I think its down to VM size now...

managed to get 10 GPU's mining and the 11 and 12th show up in BIOS as well as Dev Man and Adrenaline but when i run Claymore  i get GPU errors for two of them.  I changed VM to 19 and 24 by the way.

Don't skimp on VM lol! Make it 48 or even 96, no one else needs it.

ya I maxed it out at 24000 min and max lol.  I have 8MB of RAM so I believe 24 is the best you can do correct?  Still throwing errors and closing / restarting every few mins.  Not stable at all with the 12 cards running?

No No! Max is you free hard disk space.

k..... Maxed it RTFO and that seems to have done the trick.  All 12 working and well.  No errors no crashing yet lol.  So I guess the answer is Adrenaline and max out the VM forget  the recommended crap lol.  I think I will need a bigger SSD to add any more cards from though by the look of it.  Thanx for the help!  Greatly appreciated.

Yay!

AMD based setup is just PITA to get working.

This is an old quote but worth bringing this note to attention:

The main computer userbase is windows.  There is no denying this....   Thus solutions that fit the most widely accepted and used OS;  tend to be the most sought after by "the masses".

Not saying windows is better;  or anything close.  Most people straight up throw their hands in the air when it comes to linux.

The need for my batch files to launch ccminer are a prime example of people's lack of ability to decipher and assemble a command line argument by running the "xxx.exe --help" command.....  and this is just in windows where its widely accepted for apps to have minimal or no command-line arguments.


Facts of life drive the meta.


But its good you guys have been getting good results.

I'm waiting on acquiring more GPU's for hooking into my D8P board and testing the limits of card count in windows myself on the B250 chipset.

I use Ubuntu every day but I don't profess to be any good at it TBH.  I started down the Linux path with this project when I ran into some literature saying that W10 was actually faster for mining etc.  This was a surprise and TBH I have yet to test it out.  My "mentor" in this area suggested that I would want to mod and flash cards in Win10 due to ease but would likely want to run on a Linux based system at some point so we shall see.

Correct me if I'm wrong but don't you need 1 PCI express line per  GPU (hence only PCI-e X1 being used for mining) so you also have to look for CPU with correct amount of lines?  So for example Intel Celeron G3930 would  be a no go.

I believe the these B250 based mining motherboards provide lanes from chipset rather than CPU.

@yrk1957 I think its not that case.

that's 16 lanes from the CPU.... where's the issue?   the mining boards just have custom bios's, and less extra hardware like audio, extra SATA/IDE controllers, etc.  Nothing super fancy past that for PCIE;  its all the CPU.

G3930 has 16 lanes, just like my I3-6100 and I3-7100....   

I think your problem is windows 10 and afterburner. As much i know windows 10 just can handle 8 GPU at  same type, if you want more GPU at same type you can try windows 7 or try linux and for OC software you can use OverdriveNtool. They can handle more than 8 GPU at same type.

Also I suggest getting used to using NVSMI commands for setting clocks/etc....  it is a very powerful took, and can easily be scripted for each miner to tailor the settings for each gpu per-rig.