Why does cycles max out 1 CPU core in GPU mode?
Edit: Sorry for the auto correct fails.
When I render a scene In GPU compute mode in Cycles it will use my GPU and 100% of one of my CPU cores. I thought it was a bottleneck in the CPU but when I overclock my CPU to 5ghz it did not give any performance gain. I heard it could be a bug in the Ubuntu system monitor or maybe it might be some kind of hybrid CPU+GPU render.