Bij Thresh's FiringSquad is een artikel te vinden over de toekomst van het interne geheugen. Hieronder een plak info over het cache geheugen, het hele artikel vind je hier.
The cache sits between the processor and the main memory, feeding the processor whatever information it has on hand. Obviously, the cache cannot hold all of the information that the main memory holds, so it only keeps what information the processor has most recently used and discards the rest. There are several levels of cache, denoted by the names L1, L2, L3… etc., in descending order of speed. A L1 cache is on the same silicon die as the processor, and generally runs at the same speed. This makes it extremely fast, but electrical propagation laws limit its physical size. Some modern processors devote 80% of their transistors to the L1 cache. A typical L1 cache size is 16KB, as with the PIII.
L2 cache used to be on the motherboard, but starting with the Pentium Pro, Intel has moved the L2 cache on a separate die inside the same physical package as the processor. The L2 cache generally runs at a fraction of the processor speed, with a 128bit or 64bit interface to the processor die. By placing the L2 cache physically close to the processor, the leads in between are much shorter and the cache speed can be much higher. The older Katmai PIIIs have 512KB of discrete cache running at ½ processor speed, the new PIII Coppermines carry 256KB of cache right on the core which allows it to run at full processor speed. Some high end systems, especially ones equipped with Digital Alpha chips, come with L3 caches on the motherboard that range from 1 to 16MB. They are rare in today's new PCs, however.