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Title: Ubuntu dual geforce 1080
Post by: aurigae on November 10, 2016, 02:27:06 PM

Got a second geforce 1080, first card isa gigabyte, second msi - running on ubuntu 16.04 with nvda pro driver 367.57.

Heres the issue:

My net adaper only has 2*8 pcie

The first card, has 8 pin connectors (gigabyte 1080)
The second has 8 & 6 (msi 1080 gamingx)

ive put in the second msi card, botted up - fired up the ccminer and eth miner, both failed to detect the second card and refused to mine.

Do i need to make additional software changes or is just the power connector missing - as i was told the card should run without the second 6 pin pcie.

PS: i cant put on a cuda bridge right now as the cards have very different dimensions.

thx4 any help!

Title: Re: Ubuntu dual geforce 1080
Post by: fanatic26 on November 10, 2016, 06:41:08 PM

Try this command

lspci |grep VGA

If the system is physically detecting the second card it should show up there.

https://i.imgur.com/ZawHatP.jpg

Title: Re: Ubuntu dual geforce 1080
Post by: QuintLeo on November 10, 2016, 11:50:42 PM

1) Get the power second connector set up. There is a significant chance you can damage your motherboard if you don't do so and you push teh card hard enough, IF it will fire up at all with a power connector missing.

2) You need to update your xorg.conf for the second card.

3) Do NOT try to SLI the cards, it does not help with mining and in some cases can HURT hashrate.

the lspci trick is vender-neutral, works on amd nvidia intel and older stuff.

Title: Re: Ubuntu dual geforce 1080
Post by: aurigae on November 11, 2016, 01:07:24 AM

Thanks!

Code:

$ lspci |grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation Device 1b80 (rev a1)
02:00.0 VGA compatible controller: NVIDIA Corporation Device 1b80 (rev a1)

Added the card to Xorg.conf like this:

Code:

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BusID          "PCI:2:0:0"
EndSection

Code:

~$ ls -l /dev/nvidia*
crw-rw-rw- 1 root root 195,   0 Nov 11 01:51 /dev/nvidia0
crw-rw-rw- 1 root root 195,   1 Nov 11 01:51 /dev/nvidia1
crw-rw-rw- 1 root root 195, 255 Nov 11 01:51 /dev/nvidiactl
crw-rw-rw- 1 root root 195, 254 Nov 11 01:51 /dev/nvidia-modeset
crw-rw-rw- 1 root root 243,   0 Nov 11 01:51 /dev/nvidia-uvm
crw-rw-rw- 1 root root 243,   1 Nov 11 01:51 /dev/nvidia-uvm-tools

Finally, the magic command

Code:

$ nvidia-smi -a
Unable to determine the device handle for GPU 0000:02:00.0: Unable to communicate with GPU because it is insufficiently powered.
This may be because not all required external power cables are
attached, or the attached cables are not seated properly.

So, Confirmed, the MSI card is a powerhungry beast - so excited to see how it performs vs the gigabyte one once i get the power plug.

Title: Re: Ubuntu dual geforce 1080
Post by: aurigae on November 11, 2016, 02:05:55 PM

The MSI vs Gigabyte has 2,5MHS more on ETH :) - both cards together make 42,5MHS on ETH
To add the card you only need to add it to Xorg.conf as quoted above and reboot.

Bitcoin Forum

Alternate cryptocurrencies => Mining (Altcoins) => Topic started by: aurigae on November 10, 2016, 02:27:06 PM