Caches in this case is all about data lookup. Consistently used data/instructions will be stored on the cache and being able to read from it means not needing to read from slower storage (in this case, it would be your ram). The x3d has a larger cache, letting your cpu store more and thus do quicker lookups, but in most games, this only nets you marginal benefits. Modern cpus are not the bottleneck for games anymore.
Caches in this case is all about data lookup. Consistently used data/instructions will be stored on the cache and being able to read from it means not needing to read from slower storage (in this case, it would be your ram). The x3d has a larger cache, letting your cpu store more and thus do quicker lookups, but in most games, this only nets you marginal benefits. Modern cpus are not the bottleneck for games anymore.