I often hear people say in forums that 8-bit machines are slow, and 32-bit machines are fast. In fact, this statement is not correct. If you don't believe me, take a look at the data below.
Bit number Highest MIPS Highest bandwidth
AT89C series 8 2MIPS 2MB (8/8*2=2MB)
W77, W78 series 8 10MIPS 10MB (8/8*10=10MB)
ATmega series 8 16MIPS 16MB (8/8*16=16MB)
C8051F series 8 100MIPS 100MB (8/8*100=100MB)
SX series 8 100MIPS 100MB (8/8*100=100MB)
Msp430 series 16 8MIPS 16MB (16/8*8=16MB)
ARM7 series 32 120MIPS 480MB (32/8*120=480MB)
You see, if we don't consider other performances, ARM7 is not much faster than SX series and C8051F microcontrollers!
In addition, it does not mean that the same number of bits and MIPS capabilities will run as fast. In fact, for example, the new 89LP2052, if it runs at 16M, has 16MIPS, but the speed is not as fast as the AVR with the same MIPS, because relatively speaking, the 51 core is not as good as the AVR core.
Therefore, it is not the case that a longer word length means faster, nor is it the case that a higher MIPS means faster. It is necessary to consider the word length, MIPS and core structure comprehensively.
Reference address：A brief discussion on the performance of single chip microcomputer
Bit number Highest MIPS Highest bandwidth
AT89C series 8 2MIPS 2MB (8/8*2=2MB)
W77, W78 series 8 10MIPS 10MB (8/8*10=10MB)
ATmega series 8 16MIPS 16MB (8/8*16=16MB)
C8051F series 8 100MIPS 100MB (8/8*100=100MB)
SX series 8 100MIPS 100MB (8/8*100=100MB)
Msp430 series 16 8MIPS 16MB (16/8*8=16MB)
ARM7 series 32 120MIPS 480MB (32/8*120=480MB)
You see, if we don't consider other performances, ARM7 is not much faster than SX series and C8051F microcontrollers!
In addition, it does not mean that the same number of bits and MIPS capabilities will run as fast. In fact, for example, the new 89LP2052, if it runs at 16M, has 16MIPS, but the speed is not as fast as the AVR with the same MIPS, because relatively speaking, the 51 core is not as good as the AVR core.
Therefore, it is not the case that a longer word length means faster, nor is it the case that a higher MIPS means faster. It is necessary to consider the word length, MIPS and core structure comprehensively.
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