The ID will depend on your card, but for me it is "GPU Core Load". Just find the correct entry in the HWiNFO sensors window, and then get the ID from the included shared memory viewer application.
Interesting. On mine, I don't see usage. I've got:
Clock
Memory Clock
Utilization (which I've been using)
D3D Usage
Fan Speed
D3D Memory Dedicated
D3D Memory Dynamic
PCIe Link Speed
For what it's worth, I'm using an AMD Radeon HD 6970.
Personally, I'm not sure for the AMD Radeon HD 6970. Seems like you made the logical choice. Have you looked at the HWiNFO sensor values when gaming or running a benchmark? That should be a good indication of which one to use.
Personally, I'm not sure for the AMD Radeon HD 6970. Seems like you made the logical choice. Have you looked at the HWiNFO sensor values when gaming or running a benchmark? That should be a good indication of which one to use.