The "I Want To User Another GPU" Question
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SmellySocks
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Message 4122 - Posted: 30 Nov 2009, 17:57:30 UTC

Two ATI 4890 cards.

1. How can I use both gpus for computing?

2. How can I choose just the second 4890 card for computing?

I don't have a monitor attached to the second card.

Profile Logan
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Message 4124 - Posted: 30 Nov 2009, 18:02:19 UTC - in response to Message 4122.
Last modified: 30 Nov 2009, 18:05:30 UTC

Two ATI 4890 cards.

1. How can I use both gpus for computing?

2. How can I choose just the second 4890 card for computing?

I don't have a monitor attached to the second card.


I don't remember where is the link, but you must to lie to the other card with a dummy connector as he thinks that has a monitor attached... let me search... ;)
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SmellySocks
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Message 4125 - Posted: 30 Nov 2009, 18:06:49 UTC - in response to Message 4124.

Thanks. I've seen that one with the folding@home project.

Oh well, I'll just use one gpu.

Although I looked at the list here and it said: running device 0 and running device 1 on the apps list.

So it might just be using both!

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Message 4127 - Posted: 30 Nov 2009, 18:09:47 UTC

You either have to use a dummy plug or the alternative connection to the monitor (the usually have two now these days) ... then you have to enable the GPU by extending the display on Vista and above (sometimes on XP as well) ...

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Message 4129 - Posted: 30 Nov 2009, 18:36:41 UTC - in response to Message 4127.

You either have to use a dummy plug or the alternative connection to the monitor (the usually have two now these days) ... then you have to enable the GPU by extending the display on Vista and above (sometimes on XP as well) ...


Any tried using one of the cheap (under $20 USD) 2 port KVM switches in place of the dummy plug?

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Message 4135 - Posted: 30 Nov 2009, 19:54:03 UTC - in response to Message 4127.

Thank you for your help. I got both working perfectly.

I guess there's no way to allow the second card to crunch while I do things with the first card?

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Message 4137 - Posted: 30 Nov 2009, 20:05:45 UTC - in response to Message 4122.
Last modified: 30 Nov 2009, 20:23:25 UTC

Two ATI 4890 cards.

1. How can I use both gpus for computing?

2. How can I choose just the second 4890 card for computing?

I don't have a monitor attached to the second card.

If you only want to run the second 4890 card, you can run a cc_config.xml with the following in it (Boinc 6.10.19+ Required):

<cc_config>
<options>
<ignore_ati_dev>0</ignore_ati_dev>
</options>
</cc_config>

Claggy

Edit: info on all the Boinc config Options can be found here: How do I configure my client using the cc_config.xml file?

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Message 4138 - Posted: 30 Nov 2009, 20:07:31 UTC - in response to Message 4135.
Last modified: 30 Nov 2009, 20:08:17 UTC

Thank you for your help. I got both working perfectly.

I guess there's no way to allow the second card to crunch while I do things with the first card?


The latest boinc version has a setting in the cc_config to exclude a specific GPU so you can crunch on all but your primrary display. I don't believe there is a checkbox built into the preferences screens so it requires editing (or creating) the cc_config.xml file yourself. Also, I don't think the setting allows you to do something like "run all the time on GPU 2 but only run on GPU 1 when the computer is idle". If you'd like to have that feature, you can post the suggestion on the boinc trac boards but since most people don't have multiple GPUs, I probably won't be a top priority for the UCB developers.

Edit: Claggy, beat me to it with the specifics. Such a helpful user base!

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Message 20400 - Posted: 20 Apr 2015, 22:07:24 UTC - in response to Message 4138.

Hi, I have an intel i7-3612QM CPU with the HD4000 GPU incorporated.

I used to have only 1 cpu thread running the GPU. Now I have 2!

How do I cut it back to only 1 CPU for CC, while allowing 1-8 CPU threads for other BOINC projects? (I change depending on my use since BOINC is too stupid to feather CPU usage on its own.)


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