write down atleast five characteristics of CPU
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Answer:
1. Processor make and model: The primary defining characteristic of a processor is its make AMD or Intel and its model. Although competing models from the two companies have similar features and performance, you cannot install an AMD processor in an Intel-compatible motherboard or vice versa.
2. Socket type:
Another defining characteristic of a processor is the socket that it is designed to fit. If you are replacing the processor in a Socket 478 motherboard, for example, you must choose a replacement processor that is designed to fit that socket.
3. Clock speed:
The clock speed of a processor, which is specified in megahertz (MHz) or gigahertz (GHz), determines its performance, but clock speeds are meaningless across processor lines. For example, a 3.2 GHz Prescott-core Pentium 4 is about 6.7% faster than a 3.0 GHz Prescott-core Pentium 4, as the relative clock speeds would suggest. However, a 3.0 GHz Celeron processor is slower than a 2.8 GHz Pentium 4, primarily because the Celeron has a smaller L2 cache and uses a slower host-bus speed.
4. Host-bus speed:
The host-bus speed, also called the front-side bus speed, FSB speed, or simply FSB, specifies the data transfer rate between the processor and the chipset. A faster host-bus speed contributes to higher processor performance, even for processors running at the same clock speed. AMD and Intel implement the path between memory and cache differently, but essentially FSB is a number that reflects the maximum possible quantity of data block transfers per second. Given an actual host-bus clock rate of 100 MHz, if data can be transferred four times per clock cycle (thus "quad-pumped"), the effective FSB speed is 400 MHz.
5. Cache size:
Processors use two types of cache memory to improve performance by buffering transfers between the processor and relatively slow main memory. The size of Layer 1 cache (L1 cache, also called Level 1 cache), is a feature of the processor architecture that cannot be changed without redesigning the processor. Layer 2 cache (Level 2 cache or L2 cache), though, is external to the processor core, which means that processor makers can produce the same processor with different L2 cache sizes.