However, despite slightly different size of the associativity zones of the fully-fledged Prescott and its version cut-down to fit into the Celeron D concept, the L2 caches of Pentium 4 (Prescott) and Celeron D are equally fast. To prove this point let me offer you the results of our measurements of the memory bandwidth and its latency when working with data blocks of different sizes. The measurements were carried out with Cache Burst 32 utility:

The obtained results indicate that the cache-memory in Celeron D processors works as fast as the cache memory of Pentium 4 processors based on Prescott core. At the same time I would like to draw your attention to the considerably higher performance of the Celeron D during work with the system memory, compared with what we saw by the previous generation Celerons. I have already pointed out the reasons for this positive change above: firstly, higher bus frequency and secondly, enhanced data prefetch mechanism implemented in the Prescott core.