> Even though I didn't necessarily have 100% usage on the CPU, I was 10-20FPS below benchmarks for my GPU. This didn't really make sense to me, but after I upgr

> Even though I didn't necessarily have 100% usage on the CPU, I was 10-20FPS below benchmarks for my GPU. This didn't really make sense to me, but after I upgraded I indeed got those extra frames. That can happen when the game performance relies on the workload of one thread (or at least less then cores/thread count) that couldn't be properly offloaded to the idle cores. The 3600 has not only more but also stronger cores than the 2500K, and thus even without reaching 100% processor usage before the game can run faster now, because the critical thread runs faster.