Well that looks to be the problem. For some reason the GPU clock isn't using the 3D clock.
As for your memory usage, technically there is 4GB of VRAM on the 970, however it's got that infamous partition at 3.5GB where the last 512MB is clocked much slower.
The first thing I would do is, uninstall your driver using DDU and then re-install the driver and see if that fixes the problem.