News Best GPU Tests: How to Benchmark Your Graphics Card

If you also want to get metrics about the hardware, GPU-z's logging feature is convenient, especially since it formats it as a CSV so you can open it up in virtually any spreadsheet program. I've also found for more accurate VRAM utilization, you need to run PerfMon while capturing VRAM usage and isolate it by process. It's a lot of work, but it'll tell you what just the application is doing.