I still remember guides saying to go into BIOS and disable Hyper-Threading or any additional cores if you wanted to play specific mid-2000 games. Then when that wasn't going well, the guides had ways to select core affinity.

I specifically remember Unreal Tournament 3 that would crash with a "Negative Delta Time" error since the secondary thread could process a frame before the first thread and cause time to flow backwards. The more things change, the more they stay the same. haha