You can't use Pascal GPUs (TITAN X (Pascal), GTX 1080, GTX 1070, GTX 1060, GTX 1050, GTX 1050Ti) mixed with older GPUs in the same system, as the 9.14 app does not support older cards, and the 8.48 app does not support Pascal GPUs, and the BOINC manager does not know or take care about this, and it will make every workunit on the older card fail, thus your host will use up its daily quota in a very short time.
You have 2 options:
1. remove the older card
2. disable the older card in BOINC manager for GPUGrid (in cc_config.xml)
To do it, you have to know the number of the GPU to be disabled according to BOINC manager. You can find this information in the first lines of the event log of your BOINC manager (at its startup). For example:

Ok, thanks ZOltan !

I hope this gets resolved soon as I want to get on cracking GPUGrid at double speed ;-)

GPUGrid should release a single app, that works for all the GPUs.

GPUGrid should release a single app, that works for all the GPUs.

GPUGrid should release a single app, that works for all the GPUs.

I've been wondering about this for a long time. Why for the first time did they bring out an app that wasn't backwards compatible?

If I buy a Pascal GPU, I will want to mix with Maxwell GPUs. My PC's usually have 3 GPUs, across 2 generations, in them.

Right now, my 2 PCs are:
- RacerX: GTX 970, GTX 660 Ti, GTX 660 Ti
- Speed Racer: GTX 980 Ti, GTX 980 Ti

I plan on getting a GTX 1080 Ti (if/when it's released).
GPUGrid should support me putting it somewhere, without losing functionality of all these other GPUs.

Thanks GDF and Matt.
We're hoping you can make this work!!

http://gpugrid.net/results.php?hostid=380872

This host runs a GTX1060 and a GT730, both crunching GPUGRID, the later only short runs...

Somehow it works for me.

It seems that the CUDA 8.0 client v9.14 for Linux supports older generation cards as well.
Do you manually assign short task to the GT730? (as the BOINC manager can't do it on its own, as far as I know)

I exclude acemdlong for the GT730 in cc_config.xml...

In case anyone is wondering about mixing <use_all_gpus> and <exclude_gpu>, the following works just fine.

It runs all GPUs on projects, except GPUGRID, in which case it excludes the 2nd GPU eg #1.

I exclude acemdlong for the GT730 in cc_config.xml...

<exclude_gpu> <url>http://www.gpugrid.net/</url> <device_num>1</device_num> <app>acemdlong</app> </exclude_gpu>

Keep in mind that, when work fetch asks the server for work, it doesn't send any of your exclusion info. Thus, it's entirely possible that you might not get enough work of the right types, to keep your GPUs busy.