Reference: http://www.gpugrid.net/show_host_detail.php?hostid=153842

I have three GPUs in my Gandalf computer.
2 NVIDIA GeForce GTX 285
1 NVIDIA GeForce GTX 680

Your Computers on this account - View only sees the 680 on my Gandalf computer.

Is the 285 not good enough for GPUGRID?

Thanks

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Try adding:

<use_all_gpus>1</use_all_gpus>

to your cc_config.xml and restart BOINC

I found out that my 285 was not being seen, because I had the 680 next to it.
When I removed the 680, it saw one of the 285 GPUs but not the second.

Edit:
Amateur night special... I had the cc_config file in the wrong directory.
All's fine now.