Dmitrij M
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it its simplest level, an L3 cache is just a larger, slower version of the L2 cache. Back when most chips were single-core processors, this was generally true. The first L3 caches were actually built on the motherboard itself, connected to the CPU via the backside bus. When AMD launched its K6-III processor family, many existing K6/K-2 motherboards could accept a K6-III as well. Typically these boards had 512K-2MB of L2 cache — when a K6-III, with its integrated L2 cache was inserted, these slower, motherboard-based caches became L3 instead.