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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.
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
Cache hierarchy, or multi-level cache, is a memory architecture that uses a hierarchy of memory stores based on varying access speeds to cache data.Highly requested data is cached in high-speed access memory stores, allowing swifter access by central processing unit (CPU) cores.
Shared multithreaded L2 cache, multithreading, multi-core, around 20 stage long pipeline, integrated memory controller, out-of-order, superscalar, up to 16 MB L2 cache, up to 16 MB L3 cache, Virtualization, FlexFPU which use simultaneous multithreading, [2] up to 16 cores per chip, up to 5 GHz clock speed, up to 220 W TDP, Turbo Core Steamroller
The Prescott core was produced on a 90 nm process, and included several major design changes, including the addition of an even larger cache (from 512 KB in the Northwood to 1 MB, and 2 MB in Prescott 2M), a much deeper instruction pipeline (31 stages as compared to 20 in the Northwood), a heavily improved branch predictor, the introduction of ...
Up to 16M L3 cache (up from 8 MB) CoreLink CI-700/NI-700 Up to 32MB SLC; ARMv9.0; Performance claims: Comparing the Cortex-X2 to the Cortex-X1 with the same process, clock speed, and 4MB of L3 cache (also known as ISO-process): 16% greater integer performance / IPC; 100% greater ML performance
64 / 64 KB L1, 256 KB L2 per core, 4 MB L3 shared [59] Cortex-A75: Application profile, AArch32 and AArch64, 1–8 SMP cores, TrustZone, NEON advanced SIMD, VFPv4, hardware virtualization, 3-width decode superscalar, deeply out-of-order pipeline [60] 64 / 64 KB L1, 512 KB L2 per core, 4 MB L3 shared 8.2-9.5 DMIPS/MHz [53] [61] Cortex-A76
The 90 nm CPUs (9000 and 9100 series) bring dual-core chips and an updated microarchitecture adding multithreading and splitting the L2 cache into a 256 KB data cache and 1 MB instruction cache per core (the pre-9000 series L2 cache being a 256 KB common cache). All Itaniums except some 130 nm models are capable of >2-socket SMP.