Is The GPU Working In After Effects?

Hello,

I use the MSI GTX Geforce 660TI Power Edition, Mercury Playback Engine enabled in Premiere Pro CS6 and After Effects CS6.

When I render in Premiere I notice the Geforce GPU is used quite often, but not at a constant rate. It alters from 0% to 20% to 50% to 0% quite rapidly but most of the time it remains somewhere between 0% and 10%. I don´t remember ever seeing it getting close to 100% (which by itself shouldn´t be an issue considering the rendering demand might not be high).

In After Effects renders, though, I barely see it working. It stays in 0% almost all the time with really rare 2% peaks, while the CPU´s 8 cores are maxed out (85% to 100% in all cores, simultaneously).

Does it seem right? Is there a way to know if the GPU is working properly?

I monitor the usage through the gadgets provided in Windows 7 Home Premium.

The rest of the system:

i7 3770K

ASUS P8Z77-V Deluxe

GSkill DDR3 1600 - 8MB x 2

Thanks!