The two high-efficiency cores share 4 MB of L2 cache. Each high-performance cluster shares 12 MB of L2 cache. The eight high-performance cores are split into two clusters. The high-performance cores are clocked at 3228 MHz, and the high-efficiency cores are clocked at 2064 MHz. The M1 Pro and M1 Max use the same ARM big.LITTLE design as the M1, with eight high-performance "Firestorm" (six in the lower-binned variants of the M1 Pro) and two energy-efficient "Icestorm" cores, providing a total of ten cores (eight in the lower-binned variants of the M1 Pro). The SoC also has a 8MB System Level Cache shared by the GPU. The high-performance cores have an unusually large 192 KB of L1 instruction cache and 128 KB of L1 data cache and share a 12 MB L2 cache the energy-efficient cores have a 128 KB L1 instruction cache, 64 KB L1 data cache, and a shared 4 MB L2 cache. Apple claims the energy-efficient cores use one-tenth the power of the high-performance ones. ![]() This combination allows power-use optimizations not possible with previous Apple–Intel architecture devices. It has a hybrid configuration similar to ARM DynamIQ and Intel's Lakefield, Alder Lake and Raptor Lake processors. The M1 has four high-performance "Firestorm" and four energy-efficient "Icestorm" cores, first seen on the A14 Bionic.
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