What is different between on-die and external level2 cache?

On-die Level 2 (L2) cache is integrated directly onto the processor chip, allowing for faster access times due to reduced latency and improved bandwidth. In contrast, external L2 cache is located off the chip, which can introduce delays due to the need for data to travel between the CPU and the cache. On-die caching typically results in better performance for applications requiring quick data retrieval, while external caches may be larger but slower. Overall, on-die caches enhance speed at the cost of limited size, whereas external caches can offer more capacity but with increased access times.