Apple A4 vs A5 processors | Apple A5 vs A4 Ceev, Performance
Apple A4 thiab A5 yog Apple qhov tseeb System ntawm Chips (SoC) tsim los tsom rau lawv cov khoom siv tes. Hauv Layperson lub sij hawm, SoC yog lub computer ntawm ib qho IC (Integrated Circuit, aka nti). Technically, SoC yog ib qho IC uas sib txuas cov khoom siv hauv lub computer (xws li microprocessor, nco, input / output) thiab lwm lub tshuab uas ua haujlwm rau hluav taws xob thiab xov tooj cua. Apple A4 thiab A5 siv cov txheej txheem ntim IC hu ua Package-on-Package (PoP), qhov twg cov khoom siv logic tau ntim vertically sib nrug ntawm lawv cov ntim kab rov tav.
Ob lub ntsiab lus tseem ceeb ntawm A4 thiab A5 SoCs yog lawv ARM raws CPU (Central Processing Unit, aka processor) thiab PowerVR raws GPU (Graphics Processing Unit). Ob qho A4 thiab A5 yog raws li ARM's v7 ISA (cov lus qhia teeb tsa, ib qho uas yog siv los ua qhov chaw pib ntawm kev tsim cov processor). CPU thiab GPU nyob rau hauv ob qho tib si A4 thiab A5 yog tsim nyob rau hauv semiconductor technology hu ua 45nm. Txawm hais tias Apple tsim lawv, Samsung tsim lawv raws li kev thov los ntawm Apple.
Apple A4
A4 yog thawj zaug ua lag luam thaum Lub Peb Hlis 2010, thiab Apple siv nws rau lawv Apple iPad, thawj ntsiav tshuaj PC ua lag luam los ntawm Apple. Tom qab kev xa tawm hauv iPad, Apple A4 tom qab tau xa mus rau hauv iPhone4 thiab iPod kov 4G. A4's CPU yog tsim los ntawm Apple raws li ARM Cortex-A8 processor (uas siv ARM v7 ISA), thiab nws GPU yog raws li PowerVR's SGX535 graphics processor. CPU hauv A4 yog clocked ntawm ib tug ceev ntawm 1GHz, thiab GPU lub moos ceev yog ib tug paub tsis meej (tsis tau qhia los ntawm Apple). A4 muaj ob qho tib si L1 cache (kev qhia thiab cov ntaub ntawv) thiab L2 cache hierarchies, thiab nws tso cai rau ntim DDR2 nco blocks (txawm hais tias nws tsis muaj lub cim xeeb module ntim thaum chiv thawj). Qhov ntau thiab tsawg ntawm lub cim xeeb ntim tau sib txawv ntawm cov khoom siv sib txawv xws li 2x128MB hauv iPad, 2x256MB hauv iPhone4.
Apple A5
A5 tau muag thawj zaug hauv lub Peb Hlis 2011, thaum Apple tso nws cov ntsiav tshuaj tshiab, iPad2. Tom qab Apple lub iPhone tsis ntev los no clone, iPhone 4S tau tso tawm nrog Apple A5. Tsis zoo li A4, A5 muaj dual cores hauv nws ob qho tib si CPU thiab GPU. Yog li, technically Apple A5 tsis yog SoC xwb, tab sis MPSoC (Multi Processor System ntawm Chip). A5's dual core CPU yog raws li ARM Cotex-A9 processor (uas siv tib yam ARM v7 ISA uas yog siv los ntawm Apple A4), thiab nws cov tub ntxhais dual GPU yog raws li PowerVR SGX543MP2 cov duab processor. A5's CPU feem ntau yog clocked ntawm 1GHz (lub clocking siv zaus scaling; yog li ntawd, lub moos ceev yuav hloov ntawm 800MHz mus rau 1GHz, raws li lub load, lub hom phiaj txuag lub zog), thiab nws GPU yog clocked ntawm 200MHz. Txawm hais tias, A5 muaj qhov zoo sib xws L1 cache nco rau ntawm A4, nws L2 cache loj yog ob npaug ntawm A4. A5 los nrog 512MB DDR2 nco pob uas feem ntau clocked ntawm 533MHz.
| Apple A4 | Apple A5 | |
| Hnub tso tawm | March 2010 | March 2011 |
| Type | SoC | MPSoC |
| Thawj Device | Nyob iPad | iPad 2 |
| Lwm yam khoom siv | iPhone 4, iPod kov 4G | YiPhone 4S |
| ISA | ARM v7 | ARM v7 |
| ARM Cortex-A8 | ARM Cortex-A9 (dual core) | |
| CPU's Clock Speed | 1GHz | 1GHz (ntau zaus scaling enabled) |
| YGPU | PowerVR SGX535 | PowerVR SGX543MP2 (dual core) |
| GPU's Clock Speed | Tsis qhia | 200MHz |
| CPU/GPU Technology | 45nm | 45nm |
| L1 Cache | 32kB kev qhia, 32kB cov ntaub ntawv | 32kB kev qhia, 32kB cov ntaub ntawv |
| L2 Cache | 512kB | 1MB |
| Memory | Tsis muaj; Txawm li cas los xij, tuaj yeem ntim tau | 512MB DDR2, 533MHz |
