You can use HWiNFO exclusively or mix data sources, e.g.
Navigate to the Plugins tab, check the OverlayEditor.dll (the check mark will darken when chceked), then select it and hit Setup. In RTSS - the left side of the main window will show a list of Application profile properties with Global selected by default. The downside is you don’t have the flexibility to design your own layout. When running a DirectX game, hit the hotkey, and you’ll get something like this: Note that in RTSS, the OverlayEditor.dll should be disabled (more on that later). rename GPU Core Load to GPU - just to be consistent with the statistic called CPU which is actually the CPU temperature from the motherboard.
The usual disclaimers - don’t download from untrusted sources, and don’t blindly follow what random stranges say (I am, of course, referring to myself).