Minecraft@home now has a CPU project. The Minecraft GPU project has always (in my experience) been very inefficient and pretty much not worth running except to get another stats milestone.
However, the CPU project looks like it will be VERY good for credit rewards.
I've only done a small amount of testing on a secondary computer so far, but the results are interesting.
Quadro K2200 GPU averages about 3.2 hours per task. Credits range from around 2400 to 3100 per task. The Quadro is a temporary (had it in a desk drawer at work) replacement for a GTX 750ti that died recently. The 750ti was averaging about 2.9 hours per task for the same credit range. Approximately 25K credits per day.
Intel i7-4790 (not K) averages about 2.4 hours per single thread task, running 6 tasks simultaneously and leaving 2 threads for the GPU. Credits are locked at 2500 per task. Approximately
25K per day per CPU thread, based on a few hours of testing. And that's on a 7-year-old CPU. I have a feeling they won't leave the credits that high for very long. That's even more credits than Universe@home gives.
RAM usage is almost nonexistent. GPU tasks use about 60MB of RAM, and CPU tasks use 1.3MB per task.
When I'm in the mood, I'll test the apps on my GTX 1060 and Ryzen 9 3900X as well to see how they compare. The computer that is running it now is the one that my girls use to play Minecraft so it seemed appropriate.
edit:
The GTX 1060 is averaging around 55 minutes per task and the Ryzen 9 3900X is averaging around 2 hours and 1 minute per task. That puts the GPU estimate around 78.5K per day (lame) and the CPU at about 30K per day per CPU thread, so somewhere around 660K per day running 22 tasks. That's pretty silly for a CPU project, but I just might have to run it for a while to boost my stats milestone in the project - at least until they drop the credits down to a reasonable number...
Definitely moving the GPUs to different projects, though!
On a side note, one of the project devs has been doing their development and testing on a Pi 4 and it is averaging around 4 hours per task, so if you have any lonely/lazy Pi 4 boards lying around, they could score around 40K per day (10K per core).