SLI graphics card connector question.

Shut down BOINC fully, open notepad, paste this into it WITHOUT the periods (...)

<cc_config>
...<options>
.......<use_all_gpus>1</use_all_gpus>
...</options>
</cc_config>

Save it as ccconfig.xml in BOINC/Program Data directory. After that open BOINC back up and both cards will be used.

If you end up saving it as a .txt file it wont work. you may need to rename it after and will have to change folder options in windows uncheck Hide extensions for known file types.
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phO·kaz [foh-kuh s]
noun, plural fo·cus·es, fo·ci , verb, fo·cused, fo·cus·ing or fo·cussed, fo·cus·sing.

I am so sorry

The file name needs to be cc_config.xml

I made type-o when I posted that and didn't notice, I am so sorry you went through all that. My mistake, do as I mentioned before and you will have solved it.

Just save as cc_config.xml and save in ProgramData/BOINC directory

It works please believe me, I have had to do it two times before. I dont know where your folder may be as I have custom directories on my side. But it needs to be in where ever your Boinc folder is under ProgramData/BOINC
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phO·kaz [foh-kuh s]
noun, plural fo·cus·es, fo·ci , verb, fo·cused, fo·cus·ing or fo·cussed, fo·cus·sing.

BOINC uses only the best GPU that it detects, and it determines which is best on the following factors, in decreasing priority:
1 - compute capability
2 - software version
3 - available memory
4 - speed

You may have two GTX 680s there, but the first is probably being detected as having 8381200MB of memory, whereas the second only has 4096MB. So the first one is definitely superior. ;-)

You've been bitten by the memory detection bug that's in a lot of BOINC versions, including in 7.0.28. The first reliably working fix for this bug is in 7.0.36 or .38 (I forget which). So if you don't mind running a beta BOINC, you can upgrade to the latest stable testing version, 7.0.40. A change log for it and download links to it can be found in post 46649 of the BOINC 7 Change Log Thread.

Or you can upgrade to 7.0.42, which amongst things includes the first rendition of Intel HD Graphics 2500/4000 GPU OpenCL support, while it also includes the use of the new application configuration file (app_config.xml), with which you can tell BOINC how many instances of tasks to run on CPU and GPU, without needing to use the anonymous platform (app_info.xml).

See post 46743 in that same thread for download links and the change log.
See ClientAppConfig for information on how to use the app_config.xml file.
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Jord

- BOINC FAQ Service
- BOINC User Wiki

Real is just a matter of perception.

Good to hear :-D
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phO·kaz [foh-kuh s]
noun, plural fo·cus·es, fo·ci , verb, fo·cused, fo·cus·ing or fo·cussed, fo·cus·sing.

What is probably happening is that each GPU task is allocated a little bit of a CPU (the GPUs need to be fed data from the CPU). When you have two GPU tasks running, this uses enough of a CPU to make BOINC decide to halt another CPU task altogether so that the GPU tasks may run properly.
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