Games may be optimised to ‘use all 8 cores’ but there will be very few that can fully utilise all 8 cores. Most games are in fact hobbled by one thread which maxes out one core while the rest have far lower utilisation.
For gaming you want to get the CPU with enough cores that has the highest single threaded performance. That’s why up until now intel have always been ‘better at games’. Having 12 slower cores is not as good as having 10 faster ones at a gaming workload. It’s slightly more complex than that but in principle it’s correct for almost all gaming workloads. Ashes of the Singularity is not really representative of gaming
When you are comparing the same architecture like 5800 vs 5900 you basically want to choose the one with the highest boost clock which I think is the 5900/5950. 5600 has enough cores but it doesn’t clock as high, 5800 will be better but 5900 and 5950 will be better still (with significant demonising returns when price per performance is considered).
It also doesn’t consider overclocking. If you can get a 5800 and 5900 up to the same clock speed when overclocked, they’ll perform pretty much the same in games. Same goes for a 5600, if you can get it up to the same clocks speed there isn’t really anything that needs the two extra cores because something will be maxing one core and the other 5 are more than enough to pick up the rest.
In reality I don’t think you’ll see many other than golden 5600s getting up to the 5900 speeds though as the 5900 will get all the best 6 core chiplet’s (assuming both are overclocked).
All of the above assumes you are also cpu limited which isn’t normally the case.
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