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A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. [1] A cache is a smaller, faster memory, located closer to a processor core, which stores copies of the data from frequently used main memory locations.
An 11-bit tag supports up to 512 MiB. Each cache line also has a valid bit and a dirty bit, stored in the cache controller. (16 Kbits, or 2 Kbytes, total size.) A 512K module contains twice as many cache lines, and so requires one fewer tag bit to support the same cacheable memory size.
Cache; L1 cache: 80 KB per core: 32 KB instruction; 48 KB data; L2 cache: 2 ... 5 MB of L3 cache per core (up from 1.875 MB in Sapphire Rapids)
Level 2 (L2) Instruction and data (shared) – 1 MiB [citation needed] [original research] in size. Best access speed is around 200 GB/s [9] Level 3 (L3) Shared cache – 6 MiB [citation needed] [original research] in size. Best access speed is around 100 GB/s [9] Level 4 (L4) Shared cache – 128 MiB [citation needed] [original research] in size.
Cache; L1 cache: 32–64 KB (parity) 32kb L1 Instruction cache and 32kb L1 Data cache. or 64kb L1 Instruction cache and 64kb L1 Data cache. L2 cache: 256–512 (private L2 ECC) KiB: L3 cache: Optional, 512 KB to 4 MB (up to 8 MB) with Cortex-X1: Architecture and classification; Microarchitecture: ARM Cortex-A78: Instruction set: ARMv8-A: Extensions
There are also improvements in the branch predictor. The L1 cache size is 64 KB for instructions per core and 32 KB for data per core. The L2 cache size 512 KB per core, and the L3 is 1–2 MB per core. L3 caches offer 5× the bandwidth of previous AMD designs.
64 KB per core: L2 cache: 0.5 to 6 MB per two cores: L3 cache: 8 MB to 16 MB shared (Xeon 7400) ... Steppings with a reduced cache size use a separate naming scheme ...
All models support: MMX L2 cache is off-die and runs at 50% CPU speed; The Pentium II OverDrive is a Deschutes Pentium II core packaged for Socket 8 operation. It comes with 512 KB of off-die full-speed L2 cache, which makes it very similar to the Pentium II Xeon.