GDDR5 vs DDR2
DDR2 yog rau DDR SDRAM tsis ntev los no (ob npaug ntawm cov ntaub ntawv tus nqi synchronous dynamic random nkag nco) tsev neeg ntawm RAMs. Tus tswv cuab thib ob ntawm tsev neeg no yog DDR2. Thiab, DDR3 yog tus tswv cuab, uas ua raws li DDR2. GDDR5 (Graphics Double Data Rate, version 5) SGRAM poob rau hauv qeb ntawm DRAM daim npav daim npav nco. GDDR5 yog raws li JEDEC cov qauv. Qhov tseem ceeb tshaj, GDDR5 yog raws li DDR3 RAM. Nws cov thawj coj GDDR4 (Graphics Double Data Rate, version 4) yog raws li DDR2 RAM.
DDR2 yog dab tsi?
DDR2 SDRAM stands rau ob npaug ntawm cov ntaub ntawv tus nqi hom ob synchronous dynamic random nkag tau lub cim xeeb. Nws yog tus tswv cuab thib ob hauv DDR tsev neeg (uas tau ua raws los ntawm DDR3 RAM). Txawm li cas los xij, DDR2 RAM tsis yog rov qab siv tau nrog DDR lossis xa mus rau DDR3 RAM. Qhov ntawd txhais tau tias koj xav tau ntau hom motherboards rau DDR / DDR2 / DDR3 RAMs. Nws siv ob lub twj tso kua mis los hloov cov ntaub ntawv ntawm ob sab ntawm lub moos teeb liab (qhov no yog tus yam ntxwv ntawm RAMs hauv DDR tsev neeg). DDR2 RAM muab kev ua tau zoo ntawm plaub cov ntaub ntawv hloov mus rau ib lub voj voog moos. Yog li DDR2 tuaj yeem muab qhov siab tshaj plaws hloov pauv ntawm 3200 MB / s (nrog rau lub hauv paus moos ceev ntawm 100Mhz).
GDDR5 yog dab tsi?
GDDR5 stands rau Graphics Ob Chav Cov Ntaub Ntawv Tus Nqi, version 5. Nws yog SGRAM. Nws ntog rau qeb ntawm DRAM graphics card nco. Nws yog raws li JEDEC cov qauv. Nws yog tshwj xeeb yog npaj rau kev siv computer uas yuav tsum tau muaj bandwidth siab. GDDR5 yog tus ua tiav rau GDDR4. Tab sis, GGDR5 yog raws li DDR3 SDRAM nco (tsis zoo li GDDR4 uas yog raws li DDR2 RAM). Yog li ntawd, GDDR5 muaj ob npaug ntawm cov ntaub ntawv kab tam sim no hauv GDDR4. Txawm li cas los xij, ob qho tib si GDDR5 thiab GDDR4 muaj 8-ntsis dav prefetch buffers. GDDR5 muaj cov ntaub ntawv hloov ceev ntawm 2 cov ntaub ntawv cov lus ntawm 32-ntsis dav ib teev. GDDR5 tuaj yeem ua haujlwm nrog ob hom moos. Lawv yog CK (differential hais kom ua moos) thiab WCK (rau pem hauv ntej sib txawv moos). CK ua raws li kev siv rau qhov chaw nyob thiab cov lus txib, thaum WCK ua raws li cov ntaub ntawv nyeem / sau. CK khiav ntawm ib nrab ntawm WCK. Ib qho kev tawm ntawm Infineon hu ua Qimonda pib ntim ntau lawm ntawm 512 Mbit GDDR5 (ntawm 3.6Gbit, 4 Gbit thiab 4.5 Gbit) hauv 2008. Thawj zaug 1 Gib GDDR tau qhia los ntawm Hynix semiconductor. Lub bandwidth ntawm 20 GB / s (ntawm 32-ntsis npav) tuaj yeem txhawb nqa nrog Hynix GDDR5. Tus tshiab tsim Hynix GDDR5 (2 Gbit) tau lees tias yog lub cim xeeb ceev tshaj plaws hauv kev ua lag luam niaj hnub no. Thawj lub tuam txhab xa khoom GDDR5 nco raws li cov khoom lag luam yog AMD (hauv 2008). Lawv Radeon HD 4870 VGA series siv Qimondas '512 Mbit modules.
Dab tsi yog qhov txawv ntawm GDDR5 thiab DDR2?
GDDR5 yog SGRAM, thaum DDR2 yog SDRAM. Yog li ntawd, nws tsis yog 100% tseeb los sib piv ob hom RAMs. Txawm li cas los xij, GDDR5 yog raws li DDR3 SDRAM. Thiab DDR3 muaj ob npaug ntawm cov ntaub ntawv kab tam sim no hauv DDR2. DDR3 RAM tuaj yeem hloov cov ntaub ntawv ntawm tus nqi uas yog ob zaug ceev li DDR2 RAM. Feem ntau, DDR3 muaj bandwidth siab piv rau DDR2. Yog li, nws muaj kev nyab xeeb los hais qhov thaum nws los txog rau bandwidth (thiab yog li ntawd ceev), GDDR5 yog ua ntej ntawm DDR2 los ntawm ib qho kev txiav txim siab.
