The instruction cycle in CISC is more complex than RISC, so RISC can be more efficient at performing simpler tasks. To do complex tasks, RISC CPUs must combine simple operations from their reduced instruction set. CISC generally have hundreds of instructions whereas RISC usually has a lot less.
Instructions - RISC has fewer instructions than CISC. The key differences between the two CPUs are: Smartphones and tablets use RISC (reduced instruction set computing) ARM architecture. Most desktop or laptop computers use CISC (complex instruction set computing) architecture made by Intel or AMD. There are two main types of CPU : CISC and RISC. There is more space for RAM, which is usually larger and less expensive.Įach CPU core has its own L1 cache, but may share L2 and 元 caches. Not a lot of physical space is allocated for cache. The more L2 and 元 memory available, the faster a computer can run. L2 and 元 caches take slightly longer to access than L1. Sometimes L2 is built into the CPU with L1. They are extra caches built between the CPU and the RAM. Its size is often restricted to between 8 KB and 64 KB. L1 is usually part of the CPU chip itself and is both the smallest and the fastest to access. The more cache there is, the more data can be stored closer to the CPU.Ĭache is graded as Level 1 (L1), Level 2 (L2) and Level 3 (元): 
Transfers to and from cache take less time than transfers to and from RAM.
This saves fetching the instructions and data repeatedly from RAM – a relatively slow process which might otherwise keep the CPU waiting.
The CPU control unit automatically checks cache for instructions before requesting data from RAM. It is used to temporarily hold instructions and data that the CPU is likely to reuse. Cache is a small amount of memory which is a part of the CPU - closer to the CPU than RAM.
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