Twin GPU's

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ChrisS
Posts: 42
Joined: Tue Apr 10, 2018 5:46 pm

Twin GPU's

Post by ChrisS »

My HP Z800 workstation was quite happily using my single GTX960 card, but when I installed another GTX970 card, only the GTX970 is being used. The GTX960 is idle. How do I get both cards to be used?

I have a Dell Precision with twin cards that happily uses both.
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foldy
Posts: 2040
Joined: Sat Dec 01, 2012 3:43 pm
Hardware configuration: Folding@Home Client 7.6.13 (1 GPU slots)
Windows 7 64bit
Intel Core i5 2500k@4Ghz
Nvidia gtx 1080ti driver 441

Re: Twin GPU's

Post by foldy »

If Windows or Linux sees both GPUs then also FAH can be set to use it. Reinstall FAH to get second GPU recognized or manually add a second GPU slot in FAHControl.
ChrisS
Posts: 42
Joined: Tue Apr 10, 2018 5:46 pm

Re: Twin GPU's

Post by ChrisS »

Ok thanks. I'll reinstall FAH first, then if that doesn't work I might need some help to manually ad a second GPU slot.
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ChrisS
Posts: 42
Joined: Tue Apr 10, 2018 5:46 pm

Re: Twin GPU's

Post by ChrisS »

OK. Reinstalling FAH didn't work. How do I manually install a second GPU slot please.
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kiore
Posts: 921
Joined: Fri Jan 16, 2009 5:45 pm
Location: USA

Re: Twin GPU's

Post by kiore »

ChrisS wrote:OK. Reinstalling FAH didn't work. How do I manually install a second GPU slot please.
Go to configure and add GPU slot.
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Joe_H
Site Admin
Posts: 7926
Joined: Tue Apr 21, 2009 4:41 pm
Hardware configuration: Mac Pro 2.8 quad 12 GB smp4
MacBook Pro 2.9 i7 8 GB smp2
Location: W. MA

Re: Twin GPU's

Post by Joe_H »

The sequence should be uninstall the F@h client including data, then reinstall. Just reinstalling without removing the data leaves behind the configuration files that will be read by the client. You should also install the drivers after installing the second card so your system properly recognizes it.
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iMac 2.8 i7 12 GB smp8, Mac Pro 2.8 quad 12 GB smp6
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ChrisS
Posts: 42
Joined: Tue Apr 10, 2018 5:46 pm

Re: Twin GPU's

Post by ChrisS »

Tried that, all I get is -cpu??? What specifically do I change to what?
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SteveWillis
Posts: 389
Joined: Fri Apr 15, 2016 12:42 am
Hardware configuration: PC 1:
Linux Mint 17.3
three gtx 1080 GPUs One on a powered header
Motherboard = [MB-AM3-AS-SB-990FXR2] qty 1 Asus Sabertooth 990FX(+59.99)
CPU = [CPU-AM3-FX-8320BR] qty 1 AMD FX 8320 Eight Core 3.5GHz(+41.99)

PC2:
Linux Mint 18
Open air case
Motherboard: ASUS Crosshair V Formula-Z AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD
AMD FD6300WMHKBOX FX-6300 6-Core Processor Black Edition with Cooler Master Hyper 212 EVO - CPU Cooler with 120mm PWM Fan
three gtx 1080,
one gtx 1080 TI on a powered header

Re: Twin GPU's

Post by SteveWillis »

Seems like a lot of extra work. I never reinstall to change my GPU lineup. I just change/add slots in configure/slots. I do have to manually set gpu indexes and opencl indexes. Starting with 0 for the first gpu ind incrementing 1 for each additional gpu. Leaving it as the default -1 never works for me.

You need to check the gpu circle. If you don't it defaults to cpu.
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1080 and 1080TI GPUs on Linux Mint
ChrisS
Posts: 42
Joined: Tue Apr 10, 2018 5:46 pm

Re: Twin GPU's

Post by ChrisS »

FAH will not let me add a second GPU slot. if I change -1 to 1 or 2 all I get is -1 cpu NOT 1 GPU.
I'llll try re-installing drivers and client.
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SteveWillis
Posts: 389
Joined: Fri Apr 15, 2016 12:42 am
Hardware configuration: PC 1:
Linux Mint 17.3
three gtx 1080 GPUs One on a powered header
Motherboard = [MB-AM3-AS-SB-990FXR2] qty 1 Asus Sabertooth 990FX(+59.99)
CPU = [CPU-AM3-FX-8320BR] qty 1 AMD FX 8320 Eight Core 3.5GHz(+41.99)

PC2:
Linux Mint 18
Open air case
Motherboard: ASUS Crosshair V Formula-Z AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD
AMD FD6300WMHKBOX FX-6300 6-Core Processor Black Edition with Cooler Master Hyper 212 EVO - CPU Cooler with 120mm PWM Fan
three gtx 1080,
one gtx 1080 TI on a powered header

Re: Twin GPU's

Post by SteveWillis »

did you click the circle for gpu after you clicked add?
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1080 and 1080TI GPUs on Linux Mint
bruce
Posts: 20824
Joined: Thu Nov 29, 2007 10:13 pm
Location: So. Cal.

Re: Twin GPU's

Post by bruce »

Are you running Windows or Linux or MacOS-X?

Have you downloaded the drivers from the website owned by the GPU's chip manufacturer (Presumably you're running Windows, so in your case, that would be nvidia.com)?

The default drivers provided by both Microsoft and Linux don't always include support the features required by FAH.
ChrisS
Posts: 42
Joined: Tue Apr 10, 2018 5:46 pm

Re: Twin GPU's

Post by ChrisS »

Ok, solved it. I didn't reinstall the Nvidia drivers after fitting the second card. It all works fine now.

Many thanks to all who made suggestions.

Chris
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JimboPalmer
Posts: 2522
Joined: Mon Feb 16, 2009 4:12 am
Location: Greenwood MS USA

Re: Twin GPU's

Post by JimboPalmer »

I thank you for letting us know what fixed it.
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