I have 2 computers running this project. One is a relatively new, pretty powerful machine with a GTX 960M GPU and an i7 6700HQ CPU with 4 physical/8 logical cores. The other is a pretty old laptop with a core duo L7700 CPU with 2 physical cores (no hyperthreading) and no usable GPU.

I want to use the GPU on the first computer for this project, but ONLY use the CPU for world community grid. This is easy by just checking the GPU box and unchecking the CPU box.

The other, older computer I want to split between this project and world community grid. Again, on its own, this is easy to do.

The problem is trying to do both of these at the same time. If I only allow GPU tasks on the first computer, then the second wont receive any CPU tasks.

TLDR: Basically what the title says: how do I run CPU tasks from asteroids AND WCG on one computer, but on the other computer, run GPU tasks from asteroids but ONLY run CPU tasks from WCG and not from asteroids.

I suppose I could just allow CPU tasks on both, and just manually abort CPU tasks on the computer with a GPU, but that seems less then ideal.

http://asteroidsathome.net/boinc/prefs.php?subset=project

There are 4 different "preferences" (default, home, school, work). You can save different settings for each one.

Then...
http://asteroidsathome.net/boinc/hosts_user.php

Go to "Details" of your computer. At the bottom rows of that page there is a drop-down box called "Location". From that box you can choose which preference set you would like to use for that particular computer.

Then in Boinc, click update for Asteroids. Boinc will get correct information about which location / preference set that computer should be using.