MEMORY TECHNOLOGY FOR SMALL FORM FACTOR SYSTEMS
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Transcript of MEMORY TECHNOLOGY FOR SMALL FORM FACTOR SYSTEMS
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MEMORY TECHNOLOGY MEMORY TECHNOLOGY FOR SMALL FORM FOR SMALL FORM FACTOR SYSTEMSFACTOR SYSTEMS
Bill Gervasi
Chairman, JEDEC Memory Parametrics
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Market ChangesMarket Changes
• Desktop PC getting smaller and smallerFlex/ATX form factorTiny sealed box legacy free PCs
• Server market shifts to 1U form factorPacking more CPUs into a smaller frameHeat dissipation a top concern
• Performance ramping higher and higher
• System (fan) noise concerns
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New System DesignsNew System Designsand Form Factorsand Form Factors
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Combine market segmentsCombine market segments
DIMM SO-DIMM MicroDIMM
High capacity server, “4U”, Workstation
Desktop, Notebook,
“1U”, Router, Blades
Subnotebook, PDA
64MB – 2GB per slot
64-256 MB per slot
32-256 MB per slot
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It’s Time for a ChangeIt’s Time for a Change
• PC demand plateau at 128-256 MBDDR SO-DIMM clearly meets this need
• 30% of FlexATX PCB is memory sockets & traces
• 1U = 86% of server market (by unit)Trying to fit 6-8 CPUs in one 19” rack
• Increasing operating frequency harder to achieve with 5¼“ DIMM
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Comparing DDR Memory Comparing DDR Memory ModulesModules
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DDR ModulesDDR Modules
SO-DIMM
DIMM
NEW!MicroDIMM
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SO- and Micro- DIMMsSO- and Micro- DIMMs
DDR SO-DIMM = 67.6 mm
= 50% shorter!
DDR MicroDIMM = 45.5 mm
= 66% shorter!!!
DDR DIMM = 133.3 mm
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North Bridge
Copper
Slots
FlexATX FootprintFlexATX Footprint
With DIMM:
17k mm2
With SO-DIMM:
7k mm2Area saved
~ 60%
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Server MarketServer Market
86%
10%
4%
Edge (86)Apps (10)Database (4)
1U form factor or blade600 MHz x86 CPU256MB – 1GB RAM
(by unit shipment; source = Intel)
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1U Thin and 3U Blades1U Thin and 3U Blades
1U
3U
Vertical Socket Right Angle Socket
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Operating FrequencyOperating Frequency
DIMM
4,8,9,16,18,36 chips
x4, x8, x16 devices
Unbuffered or Registered
SO-DIMM
4,5,8 chips
x8, x16 devices
Unbuffered Only
MicroDIMM
4,8 chips
x16 devices
Unbuffered Only
Which do you think will run the fastest?Which do you think will run the fastest?
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Matching Requirements Matching Requirements and Implementationsand Implementations
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SO-DIMM RequirementsSO-DIMM Requirements
• Low cost vertical socket neededSmallest PCB footprintEnable 4 layer motherboard
• Socket concepts in progressStaggered surface mountSingle routing layer possible!
• Right angle socket okay for blade
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Concept Under AnalysisConcept Under Analysis
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Discussions Under WayDiscussions Under Way
Began negotiations with the major mother board manufacturers – all are
open to evaluating the concept
Of course, no one will make the move unless
WE ALL MOVE TOGETHER
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Fire StartedFire Started
• One major embedded application on the hookProduction of 250 Ku/mo beginning 1Q02Enough to kick start the program
• Task group formedConference calls to gather requirementsSocket suppliers debating implementation
& cost details
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We have an opportunity to establish the We have an opportunity to establish the DDR SO-DIMM as the highest volume, DDR SO-DIMM as the highest volume,
lowest cost, highest performance lowest cost, highest performance memory module in the industry.memory module in the industry.
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What about MicroDIMM?What about MicroDIMM?
• Notebooks & subnotebooks
• PDAs and Web Tablets
• High density 1U servers???
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High Density 1UHigh Density 1U
Inte
rcon
nect
fa
bric
and
I/O
CPU
CPU
CPU
CPU
CPU
CPU
CPU
CPU
Mem
Mem
Mem
Mem Mem
Mem
Mem
Mem
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MicroDIMM RequirementsMicroDIMM Requirements
• DDR MicroDIMM used in high density 1URight angle socket okay… 1x2” footprintOne module per CPU
• No vertical socket demand seen… yet…
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Heat & NoiseHeat & Noise
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Dealing w/ heat and noiseDealing w/ heat and noise
• Greatest challenge for 1U server is HEAT
• Dissipating heat takes FANS
• Fans generate MORE HEAT
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Fanless Desktop PC?Fanless Desktop PC?
• What doesn’t fit?MP3 music100W per channel ampBose surround sound speaker systemPC fans with 75 dB of white noise
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Power: DDR vs SDRPower: DDR vs SDR
0
0.5
1
1.5
2
Relative Watts
PC100
(3.3V)
1.2X
DDR266
(2.5V)
1.0X
PC133
(3.3V)
2.0X
Lower Voltage means
Lower Power
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Power: DDR vs SDRPower: DDR vs SDR
0
0.2
0.4
0.6
0.8
1
Relative MB/s per Watt
PC100
.31X
DDR266
1.0X
PC133
.25X
Double the Bandwidth yet Lower Power
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DDR Reduces PowerDDR Reduces Power
• Using DDR for main memory helps control system power
• Lower power reduces or eliminates need for fans
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Bold ProjectionBold Projection
• Fanless desktop PCs for home and small office will become a significant market demand
• DDR will help enable this important market segment
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Another Wild CardAnother Wild Card
• Low Power SDR1.8VNo DLL Inventive refresh options
• Some focus here, especially for cell phones… will it spread?
• Features considered for DDR family, too
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Cached DRAM Power ProfileCached DRAM Power Profile
NOP ACT R-PRE R R NOP
NOP R R R R NOPLower Power
Higher Power
Command Activity
Page Miss Power Profile
Page Hit Power Profile
Command Activity
…
…
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ConclusionsConclusions
• Market form factors are changing
• New designs require rethinking our past assumptions
• DDR SO-DIMM could replace the DIMM for desktop applications
• Lower power would allow us to eliminate noisy fans
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Thank YouThank You