Each core is a Chinese prison worker farming WoW gold.
Would you collect gold faster by having:
- 4 Chinese prison workers each with one instance of WoW running full screen
or
- 2 Chinese prison workers, each with two instances of WoW running full screen and alt-tabbing back and forth.
Assume for this example that all workers have the same waking and sleeping hours. Also that all Chinese prison workers are of equal capability (which is not really the case, since the i5 Chinese prison workers with names ending in k can be overclocked, while the someone has clock-blocked us from all of the i3 Chinese prison workers)