It’s not just cores - it is higher performance per rack unit while keeping power consumption and cooling needs the same.
That allows rack performance upgrades without expensive DC upgrades - and AMD has been killing dual and quad socket systems from intel with single and dual core epycs since launch now. Their 128 core one has a bit too high TDP, but just a bit lower core count and you can still run it in a rack configured for power and cooling needs from over a decade ago.
Granite rapids has too high TDP for that - you either go upgrade your DC, or lower performance per rack unit.
I guess empty ones are hard to find - but some manufacturers (like Foma) are selling their films in them. In other news, I’m drowning in those things.