Coding Starts Here. CPU cache. Overviews[edit] When the processor needs to read from or write to a location in main memory, it first checks whether a copy of that data is in the cache.
If so, the processor immediately reads from or writes to the cache, which is much faster than reading from or writing to main memory. Understanding CPU caching and performance. Introduction Back when Ars first started, Intel had just released the first Celeron processor aimed at the low end market, and since it lacked an off-die backside cache like its cousin the PII it turned out to be extremely overclockable.
The Celeron really pushed the overclocking craze into the mainstream in a big way, and Ars got its start by providing seats on the bandwagon to anyone with a web browser and a desire to learn the hows and whys of Celeron overclocking.