Apple A4 vs NVIDIA Tegra 2 | NVIDIA Tegra 2 vs Apple A4 Ceev, Kev Ua Haujlwm
Kab lus no piv ob qhov System-on-Chips (SoC), Apple A4 thiab NVIDIA Tegra 2, ua lag luam los ntawm Apple thiab NVIDIA raws li tsom mus rau cov khoom siv tes tuav. 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 tso nws cov A4 processor nyob rau lub Peb Hlis 2010 nrog nws cov ntsiav tshuaj inaugural PC, Apple iPad. NVIDIA tso Tegra 2 hauv thawj peb lub hlis twg ntawm 2010.
Feem ntau, cov khoom tseem ceeb ntawm SoC yog nws CPU (Central Processing Unit) thiab GPU (Graphics Processing Unit). CPUs nyob rau hauv ob qho tib si A4 thiab Tegra 2 yog raws li ARM's (Advanced RICS - Txo Cov Kev Qhia Teeb Meem Computer - Tshuab, tsim los ntawm ARM Holdings) v7 ISA (Instruction Set Architecture, ib qho uas yog siv los ua qhov chaw pib ntawm kev tsim lub processor).
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 iPhone 4 thiab iPod Touch 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 sib txawv ntawm cov khoom siv sib txawv xws li 2x128MB hauv iPad thiab 2x256MB, hauv iPhone4.
NVIDIA Tegra 2 (Series)
NVIDIA, Ameslikas yog GPU (Graphics Processing Unit) lub tuam txhab tsim khoom [tau lees tias tau tsim GPUs hauv lub nineties lig] tau tsis ntev los no tau tsiv mus rau hauv kev lag luam txawb, qhov twg NVIDIA's System ntawm Chips (SoC) tau xa mus rau hauv xov tooj, ntsiav tshuaj thiab lwm yam khoom siv tes tuav. Tegra yog SoC series tsim los ntawm NVIDIA lub hom phiaj xa mus rau hauv kev ua lag luam txawb. Tegra 2 series SoCs yog thawj zaug ua lag luam thaum ntxov 2010, thiab thawj cov khoom siv uas tau xa tawm yog qee qhov tsis muaj npe nrov ntsiav tshuaj PCs. Thawj qhov kev xa tawm ntawm tib yam hauv lub xov tooj ntse tuaj thaum Lub Ob Hlis 2011 thaum LG tso nws lub xov tooj Optimus 2X. Tom qab uas muaj coob tus ntawm lwm lub xov tooj ntawm tes tau siv Tegra 2 series SoCs, qee qhov yog Motorola Atrix 4G, Motorola Photon, LG Optimus Pad, Motorola Xoom, Lenevo ThinkPad Tablet thiab Samsung Galaxy Tab 10.1.
Tegra 2 series SoCs (txheej txheem MPSoC, vim muaj ntau tus txheej txheem CPU xa tawm) muaj ARM Cotex-A9 raws li cov tub ntxhais kawm dual CPUs (uas siv ARM v7 ISA), uas feem ntau clocked ntawm 1GHz. Lub hom phiaj me me tuag, NVIDIA tsis txhawb NEON cov lus qhia (ARM's Advanced SIMD txuas ntxiv) hauv cov CPUs no. GPU ntawm kev xaiv yog NVIDIA's Ultra Low Power (ULP) GeForce, uas muaj yim cores ntim rau hauv nws (nws tsis yog qhov xav tsis thoob rau lub tuam txhab nto moo rau lawv ntau rau ntau cov tub ntxhais GPUs). Cov GPUs tau teev nyob nruab nrab ntawm 300MHz txog 400MHz hauv cov chips sib txawv hauv koob. Tegra 2 muaj ob qho tib si L1 cache (kev qhia thiab cov ntaub ntawv - ntiag tug rau txhua tus tub ntxhais CPU) thiab L2 cache (sib koom ntawm ob lub CPU cores) hierarchies, thiab nws tso cai rau ntim txog 1GB DDR2 nco modules.
Kev sib piv ntawm Apple A4 thiab NVIDIA Tegra 2 Series yog tabulated hauv qab no.
| Apple A4 |
NVIDIA Tegra 2 Series |
|
| Hnub tso tawm | March 2010 | Q1 2010 |
| Type | SoC | MPSoC |
| Thawj Device | Nyob iPad |
LG Optimus 2X (thawj zaug xa tawm mobile) |
| Lwm yam khoom siv | iPhone 4, iPod kov 4G | Motorola Atrix 4G, Motorola Photon 4G, LG Optimus Pad, Motorola Xoom, Motorola Electrify, Lenevo ThinkPad Tablet, Samsung Galaxy Tab 10.1 |
| ISA | ARM v7 (32 ntsis) | ARM v7 (32 ntsis) |
| ARM Cotex A8 (Single Core) | ARM Cortex-A9 (Dual Core) | |
| CPU's Clock Speed | 1.0 GHz | 1.0 GHz – 1.2 GHz |
| YGPU | PowerVR SGX535 | NVIDIA GeForce (8 cores) |
| GPU's Clock Speed | Tsis Qhia | 300MHz - 400MHz |
| CPU/GPU Technology | TSMC's 45nm | TSMC's 40nm |
| L1 Cache | 32kB kev qhia, 32kB cov ntaub ntawv |
32kB kev qhia, 32kB cov ntaub ntawv (rau txhua tus tub ntxhais CPU) |
| L2 Cache | 512kB |
1MB (sib koom ntawm ob lub CPU cores) |
| Memory | iPad muaj 256MB Tsawg Zog DDR2 | Txog 1GB |
Summary
Hauv cov ntsiab lus, txawm hais tias ob qho tib si Apple A4 thiab NVIDIA Tegra 2 series SoCs tau qhia nyob rau tib lub sijhawm, Tegra2 cov yam ntxwv tau zoo thiab zoo dua nyob rau hauv feem ntau. Pib los ntawm CPU (dual core hauv Tegra 2 vs. ib leeg tub ntxhais hauv A4) thiab tom qab ntawd GPU (SGX535 vs. GeForce 8core), rau ob qho tib si uas tau muab los ntawm Tegra 2 paub tias ua tau zoo dua. Ib qho teeb meem hauv Tegra 2 chips yog tias lawv tsis txhawb NEON kev qhia teeb tsa, thaum A4 ua. Hauv cache hierarchy, Tegra 2 muaj qhov loj dua L2 cache piv rau A4 (512kB hauv A4 vs. 1MB hauv Tegra2). Yog li ntawd, NVIDIA Tegra 2 ua haujlwm tau zoo dua Apple A4 hauv feem ntau ntawm qhov loj.
