Kusiyana pakati pa DDR4 ndi DDR5 RAM ndi liwiro komanso kuthekera
Malinga ndi JEDEC, m'badwo wotsatira wa DDR5 kukumbukira mwachisawawa (RAM) udzakhala wachangu kawiri kuposa DDR4 RAM wapano pomwe idatulutsidwa.
JEDEC yalengeza kuti imaliza miyezo ya DDR5 nthawi ina mu 2018, ndipo bungweli likuti DDR5 ichulukitsa bandwidth ndi kachulukidwe pa DDR4, ndikubwera ndi kuchuluka kwa mphamvu zamagetsi.
Ngakhale mulingo udzakhala wovomerezeka chaka chamawa, m'badwo watsopano sudzakhala wokonzeka kwa opanga mpaka 2020 itatha.
Ndizofunikira kudziwa kuti mulingo wa DDR4 udamalizidwa mu 2012, koma sizinachitike mpaka 2015, pomwe mapurosesa ndi ma SoC adayenera kusinthidwa kuti athandizire.
DDR5 ndi chiyani
GDDR5 (Dual Graphics Data Rate Version 5) SDRAM ndi mtundu wa khadi lojambula bwino la DRAM lopangidwira mapulogalamu apakompyuta apamwamba kwambiri.
Monga momwe idakhazikitsira, GDDR4, idakhazikitsidwa pa GDDR5 SDRAM DDR3 yomwe ili ndi mizere ya data kawiri kuposa DDR2 SDRAM, komanso ili ndi GDDR5 ya 8-bit wide prefetch buffers yofanana ndi GDDR4. GDDR5 SGRAM imagwirizana ndi miyezo yotchulidwa mu GDDR5 yolembedwa ndi JEDEC. Imagwiritsa ntchito mawonekedwe a DDR 8N prefetch architecture kuti azigwira ntchito kwambiri komanso kuti azigwira ntchito zomwe zitha kukonzedwa kuti ziziyenda mu 32 x kapena 16 x (clamshell) mode yomwe imadziwika pakuyambitsa chipangizo. GDDR5 2 zoyendera mawonekedwe ali 32-bit wotchi mawu pa kuzungulira (WCK) kulemba deta ku/kuchokera mapini I/O. Kufikira kofananira kumakhala ndi -8N prefetch,
Kapena lembani kapena werengani, kuchokera pakusintha kwa data kwa CK 2 pa wotchi yayikulu ya 256-bit. Chimake chamkati chamkati chimakhala ndi masamu asanu ndi atatu a WCK pa wotchi yofananira ndi theka ndi m'lifupi ma bits 32 pa zikhomo za I / O.
Kusiyana pakati pa DDR4 ndi DDR5
GDDR5 imagwira ntchito ndi mitundu yosiyanasiyana ya wotchi. Lamulo la kusiyana kwa wotchi (CK) monga chofotokozera cha adilesi ndi zolowetsa zamalamulo, lembani kusiyana kwa wotchi (WCK) ngati cholembera chomwe chimawerenga ndikulemba. Kunena zowona, chandamale cha mawotchi a SGRAM GDDR5, iliyonse yaiwo imayikidwa ma byte awiri.
WCK imagwira ntchito pafupipafupi CK. Kutengera GDDR5 yokhala ndi 5 Gbit/s data rate pa pini mwachitsanzo, wotchi ya CK imagwira ntchito ndi 1.25 GHz ndi WCK yokhala ndi 2.5 GHz.
Mawotchi a CK ndi WCK adzayanjanitsidwa poyambitsa ndi kuphunzitsidwa motsatizana. Kugwirizana kumeneku kumathandizira kuwerenga ndi kulemba ndi latency yochepa. Single 32-bit GDDR5 ndi Pin Pin, mapulogalamu athu awonetsa ndikuyesa GDDR5, ndikuwonetsa pepala pamaukadaulo omwe ali kumbuyo kwa GDDR5.
. Pa Meyi 10, 2008, Kimunda adalengeza kuti ma module a 512 GDDR5 akupanga 3.6 Gbit/s (900 MHz), 4.0 Gbit/s (1 GHz), ndi 4.5 Gbit/s (1.125 GHz). Kuti mudziwe zambiri, pitani Wikipedia
