I don't necessarily run GPU computations, but have only seen Open Pandemics (OPNG) offered to my Intel Graphics. I wasn't aware MCM had any at present.

Perhaps someone can confirm this for you.

There is a WCG GPU Support Forum that might be able to better assist --> https://www.worldcommunitygrid.org/forums/wcg/listthreads?forum=560

Why exclude GPU computation?

MCM1 uses a library that is coded to run on standard CPUs. I rather suspect that it wouldn't port very well :-(

As Bryn Mawr points out, some types of application don't suit GPU logic (which, for instance, has only basic condition-test, branch and loop facilities and cannot simultaneously pursue multiple code paths within a single "kernel" (so heavily nested conditionals are likely to cause efficiency issues if they'll run at all) -- some applications (such as those involving Fourier transforms, and certain types of "finite element" analysis) map very well, others may not convert at all :-)

And if only a small part of the necessary calculations can be done on a GPU, the effort involved in moving data to and fro may actually result in it not being worth the effort (e.g. MilkyWay's N-body program...)

It's disappointing, but it is what it is...

Cheers - Al.