The value of Cache does not increase linearly with size. You also run into latency issues, so Having L4 cache on a modern motherboard would have little value.
The value of cache memory is the "hit ratio". If increasing cache size by 50% increases cache-hit from 95% to 99%, is worth it, as the 5% of cache-misses could reduce CPU performance to one half.
Comments
The value of Cache does not increase linearly with size. You also run into latency issues, so Having L4 cache on a modern motherboard would have little value.
The value of cache memory is the "hit ratio". If increasing cache size by 50% increases cache-hit from 95% to 99%, is worth it, as the 5% of cache-misses could reduce CPU performance to one half.