3(1/2021
`
`What is the ditterence between SDRAM, DDR1, DDR2, DDR3 and DDR4? - Transcend Information, Inc.
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`What is the difference between SDRAM, DDR1, DDR2, DDR3 and DDR4?
`
`Category Specification [Capacity] Performance
`
`SDRAM (S/nchronous Dynamic RaidomAcoass Memory):
`
`'Synchronous'tellthhebehavburottheDRAMtype. Inlate1996,SDRAMbegantoappearin system. Unlikeprevioustechmbgjes,
`SDRAMisdasigledtosyrfluonizeilsetfwiththetirringofmeCPU.TlisenaHecflIemenuyoutrolertohmmearaddodrcydewhm
`fiemesteddataflllbereadyfiomeCPUmbnguhasmwdtbemmenmym.Forexample,PCGSSDRAansat66MT/s.
`P0100 SDRAMrunsat 100 MTIs, PC133 SDRAM lunsat133 MT/s,andsoon.
`SDRAMcaIstandforSDRSDRAM(SingeDataRateSDRAM),wherethelI0, internal dodmndbusdockaethesame. ForexampleJhe
`llO,intemddod(andbusdockofPC133areall133Mhz.SingeDataRatemeansthatSDRSDRAM-nonlyreadlwriteonetineina
`dockqde.SDRAMmmmflfaflewnflefiondflmpmwsmrmwbedkmdoamflmrmadmnteopaafion.
`
`DDR SDRAM (DoubteDda RateSDRAM):
`ThenextgenelaionofSDRAMisDDR,MidIadIievesgreaterbaidwidhmanmeprecedngsingledatarateSDRAMbytransferritgdata
`ontherisitgandtalingedgesofthedocksignaudoubteptmped).Eflecfivelyfidoublasfllehansferratewihominueasingmefiemencyof
`thectodcThebandarateofDDRSDRAMBfliedotfledSDRSDRAMMflufidlmghgflieifimnldodLDDRSDRAM,astheflst
`genaafionofDDRnierruy,meprefetdIlmfieri52bit,whHIismedabled SDRSDRAM.ThetransferrateofDDRisbetween266~400
`Ml'ls. DDR2663nd DDR400areofttis type.
`
`DDRZSDRAM(Doub|eDataRateTwo SDRAM):
`IlspdmawbenefitismeabiflytooperatemeextemaldatawsMceastastasDDRSDRAM.'lhisisachievedbyimrwedbussigtal.‘l'he
`prefetchbutferofDDR2is4tit(dotbleofDDRSDR/\M). DDR2memyisatthesameintemaIdockspeed(133r-200MHZ)aSDDR, butthe
`hansfermteofDDR2mnreadl533~800MTlsMflImeinpmvedUOtxssigld DDR25333ndDDR2800memorytypesareonthe
`market.
`
`DDR3 SDRAM(Doub|e Data RateTtleeSDRAM):
`DDR3mermxyreduoes40‘56powerconsurptionmamdbunmtDDRanxhles,dangfabwuoperatiigunentsandvdtags
`(1.5V,corrpaedtoDDR2's1.8VorDDR's2.5V).“rehasfenatedDDR3is800-4600MTIS. DDR3'sprefetchbutferwidthi58bit,
`vmereasDDRZ'sis4biLand DDR'sistiL DDRSalsoaddstwofmctions,suntasASR(AummaicSetf-Retresh)andSRT(SeIf-Retmsh
`Tenperature).'lheymnmdrememanmymnhdmerehmhrateaoomdingtometermerahlevanafim.
`
`DDR4 SDRAM (Dotble Data Rate Fourth SDRAM):
`DDR4 SDRAMprovidesthelmeroperatingvoltage(1.2V)md himertransterrate.ThetrasferrateofDDR4i52133-3200 Ml'ls. DDR4
`
`addsfournemekGupstedmology. Eadlbankgrotphasthefeatureotshglehandedoperation. DDR4mnprooess4¢htawittina
`dodtcycle,soDDR4'sefliciencyisbetterthmDDR30bvimsly.DDR4dsoaddssomefux1ions,suchasDBl(DataBuslnversion),CRC
`(Cycic Redundancy Check) and CA parity. They can enhance DDR4 merers signal integrity, and inprove the stability of data
`transmission/access.
`
`
`
`
`Data rate
`
`Transfer rate
`
`Voltage
`
`(MT/s)
`100-166
`
`(GB/s)
`0.8- 1.3
`
`(V)
`
`DDR SDRAM
`
`Internal
`
`Bus clock
`
`Standard
`SDRAM
`
`rate (MHz)
`100-166
`
`(MHZ)
`100-1661n
`
`BLEfliCh
`
`m-
`133-200
`266-400
`533-800
`4.2-64
`1.8
`
` ———m———
`
`DDR3
`
`133-200
`
`533-800
`
`1066-1600
`
`8. 5-149
`
`1. 35/1. 5
`
`(ISupportIFAQ/FAQPits/DDRJPG)
`
`“tanksforyoufeetbadLSendSIms!
`
`_
`htmszlmW.umscend4nfo.cumSuwomFAQ296
`
`Patent Owner Monterey Research, LLC
`Exhibit 2000, 0001 1/2
`
`

`

`3(1/2021
`
`What is the diflerence between SDRAM, DDR1, DDR2, DDR3 and DDR4? - Transcend Information, Inc.
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