It’s 4 cores. But yeah, I used to roll with 3570k in the olden days and it was not pretty at times. Wouldn’t put it past a CPU bottleneck.
And the card is silent on high settings, so it is not fully loaded.
Is it actually being used at all? There’s history with UE defaulting to iGPUs. You can see it in the Task Manager in case you’re not running any other hardware monitoring.