Most of the RAM (Random Access Memory) that computers use is inexpensive dynamic RAM. In modern computers, dynamic RAM is actually too slow to keep up with the bus speeds. To compensate for this, computers incorporate a small amount of expensive Cache (or Static) RAM, which is fast enough to keep up with system speeds (this is also called a Level 2 or L2 cache). All modern CPUs have a small cache built into the chip itself (8-16k). External cache memory can also be added to improve performance. PowerPC’s require at least 256k per CPU (or more). Pentium Pro chips have a built-in L2 (256 or 512k) cache that runs at a full 200 MHz, greatly speeding performance. How much cache RAM you should have depends on the amount of total RAM your computer has. Unless you are running serious graphics systems, 256 or 512k should be fine. Increasing to 1 Mb will only provide a minor performance improvement.