"L1" is also used as an abbreviation for "Level 1 cache." As such, it refers to that random access memory (RAM) that is incorporated within the architecture of a microprocessor (most frequently in the form of SRAM that is on or near the microprocessor die).
Some CPUs and the corresponding amount of L1 cache they possess:
- Intel 80486: 8k
- Intel Pentium Pro: 16k
- Intel Pentium MMX: 32k
- Intel Pentium II: 32k
- Intel Celeron: 32k
- Cyrix 6x86MX: 64k
- AMD K5: 24k
- AMD K6: 64k
- AMD Athlon (K7): 128k
- AMD Thunderbird: 128k
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