Bitcoin Forum

Hi there:

Sorry for disturbing. I'm new into mining but I bought 5 Gigabyte 1080Ti, an i3, 4GB DDR4, 2 PSU 1kW each and an MSI H270 PC MATE.

I've got 2 GPUs connected to the same PSU which is feeding motherboard and so on. The other 3 GPUs are being feeded by the other PSU.


1.- I have already tried each card separately and works fine, with except of the 5th one using the 5th riser. I was discarding problems related with riser cards and looks like I may have 1 (the 5th one) risercard not working properly (displays nothing on screen).

2.- I tried to increase the connected GPUs one by one and I got up to 3 working on different PCI-E slots. The 4G option is enabled. Gen is set to Auto, and tried to Gen 1 as well.


Looks like the 2nd PCI-E slot is undetected if I connect 4 GPUs, detecting just3 of them: the first, the third and the fourth. I changed combinations to discard anything related with risercards and so on and the conclusion is: if more than 2 are connected, 2nd PCI-E is not detected. Sometimes I even get a BSOD (Win 10 x64 up to date installed). BIOS up to date as well.

I read about disabling some SATA ports because "they use bandwich" and haven't tried this last thing yet, but sounds weird thinking that a recent motherboard wouldn't support having all SATA ports and PCI-E ports being used at same time.

Am I missing something? I'm getting crazy with this. I knew it wasn't going to be "plug and play" but this is getting way too much crazy.


Thanks in advance.

Hi Gonzo345,

I have a similar problem with PC MATE 270.

I have 5 RX580 and only 4 of them are recognized by the motherboard. I've tried everything including BIOS update with no luck. Did you able to find a solution?

Hello,
I have similar problem and  could not install more than 4 GPUS (using slots 1,3,4 and 5)
After messing up with drivers, bios, risers and everything I re-read the manual
"The PCI_E2/ PCI_E5 slot will be unavailable when an expansion card has been
installed in the PCI_E3/ PCI1 slot."

So, as far as I understand SLOT 2 AND 3 CANNOT WORK TOGETHER!
It seems unbelievable to me (why put 5 pci-e slots on a mobo when I cannot use them all!)
I'm not quite an expert of PCI-E lanes etc., so just to make a a trial,  I've ordered this expansion card:

https://www.aliexpress.com/item/NEW-Add-in-Card-PCIe-1-to-4-PCI-Express-16X-Slots-Riser-Card-PCI-E/32832542698.html?spm=a2g0s.9042311.0.0.Arny56  (https://www.aliexpress.com/item/NEW-Add-in-Card-PCIe-1-to-4-PCI-Express-16X-Slots-Riser-Card-PCI-E/32832542698.html?spm=a2g0s.9042311.0.0.Arny56)

Let's see if I will be able to expand up to 6 working GPU's.

I can still only get slots 1, 4 and 5 working mining. If I also use slot 3 the 4th gpu in slot 3 shows up but does nothing. If I put 4th gpu in slot 2 it doesn't show it. Just original 3 gpus. Anyone get a solution?

The solution is to replace the motherboard. MSI motherboards are far and away the most troublesome for crypto mining. I say this having worked directly with MSI to try and certify some of their boards for crypto mining.

Do you try enabling 4g decode and using pci-e splitter.  I did and worked for me.

This, Get an ASUS 270A-PRO or something similar. ASUS motherboards are crypto-friendly additionally there are plently of cheap "Mining" motherboards for around $50 USD