Qhov sib txawv ntawm DDR4 thiab DDR5 RAM yog nyob rau hauv ceev thiab muaj peev xwm
Raws li JEDEC, tiam tom ntej DDR5 random nkag tau lub cim xeeb (RAM) yuav yog ob zaug nrawm dua li tam sim no DDR4 RAM thaum nws tawm.
JEDEC tau tshaj tawm tias nws yuav ua tiav cov qauv DDR5 qee zaum hauv 2018, thiab lub koom haum hais tias DDR5 yuav ua ob npaug ntawm bandwidth thiab ntom dua DDR4, thiab yuav los nrog kev nce hauv kev siv hluav taws xob.
Txawm hais tias tus qauv yuav dhau los ua haujlwm rau xyoo tom ntej, tiam tshiab yuav tsis npaj rau cov tuam txhab kom txog thaum xyoo 2020.
Nws yog ib qho tsim nyog sau cia tias DDR4 tus qauv tau ua tiav hauv xyoo 2012, tab sis nws tsis yog txog xyoo 2015, thaum processors thiab SoCs yuav tsum tau hloov kho los txhawb nws.
Dab tsi yog DDR5
GDDR5 (Dual Graphics Data Rate Version 5) SDRAM yog ib hom kev ua haujlwm siab DRAM daim npav uas tsim los rau high-bandwidth computer applications.
Zoo li nws cov thawj coj, GDDR4, nws yog raws li GDDR5 SDRAM DDR3 uas muaj ob zaug cov ntaub ntawv kab dua li DDR2 SDRAM, tab sis nws kuj muaj GDDR5 ntawm 8-ntsis dav prefetch buffers zoo ib yam li GDDR4. GDDR5 SGRAM ua raws li cov qauv hais hauv GDDR5 specification los ntawm JEDEC. Nws siv DDR 8N prefetch architecture interface kom ua tiav kev ua haujlwm siab thiab kev ua haujlwm uas tuaj yeem teeb tsa kom khiav hauv 32 x lossis 16 x (clamshell) hom kuaj pom thaum pib ntaus ntawv. GDDR5 2 thauj khoom interface muaj 32-ntsis moos lo lus ib lub voj voog (WCK) sau cov ntaub ntawv mus rau / los ntawm I / O pins. Kev nkag mus tau muaj xws li -8N prefetch,
Los yog sau lossis nyeem, los ntawm CK 2 cov ntaub ntawv hloov mus rau ntawm 256-ntsis dav moos. Lub cim xeeb sab hauv muaj yim WCK cov ntaub ntawv hloov mus rau ib nrab-lub voj voog sib raug rau 32-ntsis dav ntawm I / O pins.
Qhov txawv ntawm DDR4 thiab DDR5
GDDR5 ua haujlwm nrog ntau hom moos. Lub moos sib txawv (CK) raws li kev siv rau qhov chaw nyob thiab cov lus txib inputs, sau lub moos sib txawv (WCK) raws li kev siv uas nyeem thiab sau. Txhawm rau kom meej meej, lub hom phiaj ntawm SGRAM GDDR5 moos, txhua tus ntawm lawv tau teem rau ob bytes.
WCK ua haujlwm ntawm ob zaug CK zaus. Noj GDDR5 nrog 5 Gbit / s cov ntaub ntawv tus lej ib tus pin ua piv txwv, CK moos ua haujlwm nrog 1.25 GHz thiab WCK nrog 2.5 GHz.
CK thiab WCK moos yuav raug ua kom zoo thaum lub sijhawm pib thiab kev cob qhia ua ntu zus. Qhov kev sib raug zoo no ua rau kev nyeem ntawv thiab sau ntawv nrog tsawg kawg latency. Ib leeg 32-ntsis GDDR5 thiab Pin Pins, peb daim ntawv thov tau ua qauv qhia thiab ua qauv GDDR5, thiab ua qauv qhia ib daim ntawv ntawm cov thev naus laus zis tom qab GDDR5
. Lub Tsib Hlis 10, 2008, Kimunda tshaj tawm cov khoom ntim ntawm 512 GDDR5 modules nyob ntawm 3.6 Gbit / s (900 MHz), 4.0 Gbit / s (1 GHz), thiab 4.5 Gbit / s (1.125 GHz). Yog xav paub ntxiv, mus saib Wikipedia
