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MEMORY TECHNOLOGY FOR SMALL FORM FACTOR SYSTEMS Bill Gervasi Chairman, JEDEC Memory Parametrics.

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Presentation on theme: "MEMORY TECHNOLOGY FOR SMALL FORM FACTOR SYSTEMS Bill Gervasi Chairman, JEDEC Memory Parametrics."— Presentation transcript:

1 MEMORY TECHNOLOGY FOR SMALL FORM FACTOR SYSTEMS Bill Gervasi Chairman, JEDEC Memory Parametrics

2 Market Changes Desktop PC getting smaller and smaller  Flex/ATX form factor  Tiny sealed box legacy free PCs Server market shifts to 1U form factor  Packing more CPUs into a smaller frame  Heat dissipation a top concern Performance ramping higher and higher System (fan) noise concerns

3 New System Designs and Form Factors

4 Combine market segments DIMMSO-DIMMMicroDIMM High capacity server, “4U”, Workstation Desktop, Notebook, “1U”, Router, Blades Subnotebook, PDA 64MB – 2GB per slot MB per slot MB per slot

5 It’s Time for a Change PC demand plateau at MB  DDR 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

6

7 Comparing DDR Memory Modules

8 DDR Modules SO-DIMM DIMM NEW! MicroDIMM

9 SO- and Micro- DIMMs DDR SO-DIMM = 67.6 mm = 50% shorter! DDR MicroDIMM = 45.5 mm = 66% shorter!!! DDR DIMM = mm

10 North Bridge Copper Slots FlexATX Footprint With DIMM: 17k mm 2 With SO-DIMM: 7k mm 2 Area saved ~ 60%

11 Server Market 1U form factor or blade 600 MHz x86 CPU 256MB – 1GB RAM (by unit shipment; source = Intel)

12 1U Thin and 3U Blades 1U 3U Vertical Socket Right Angle Socket

13 Operating 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?

14 Matching Requirements and Implementations

15 SO-DIMM Requirements Low cost vertical socket needed  Smallest PCB footprint  Enable 4 layer motherboard Socket concepts in progress  Staggered surface mount  Single routing layer possible! Right angle socket okay for blade

16 Concept Under Analysis

17 Discussions 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

18 Fire Started One major embedded application on the hook  Production of 250 Ku/mo beginning 1Q02  Enough to kick start the program Task group formed  Conference calls to gather requirements  Socket suppliers debating implementation & cost details

19 We have an opportunity to establish the DDR SO-DIMM as the highest volume, lowest cost, highest performance memory module in the industry.

20 What about MicroDIMM? Notebooks & subnotebooks PDAs and Web Tablets High density 1U servers???

21 High Density 1U Interconnect fabric and I/O CPU Mem

22 MicroDIMM Requirements DDR MicroDIMM used in high density 1U  Right angle socket okay… 1x2” footprint  One module per CPU No vertical socket demand seen… yet…

23 Heat & Noise

24 Dealing w/ heat and noise Greatest challenge for 1U server is HEAT Dissipating heat takes FANS Fans generate MORE HEAT

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26 Fanless Desktop PC? What doesn’t fit?  MP3 music  100W per channel amp  Bose surround sound speaker system  PC fans with 75 dB of white noise

27 Power: DDR vs SDR PC100 (3.3V) 1.2X DDR266 (2.5V) 1.0X PC133 (3.3V) 2.0X Lower Voltage means Lower Power

28 Power: DDR vs SDR PC100.31X DDR X PC133.25X Double the Bandwidth yet Lower Power

29 DDR Reduces Power Using DDR for main memory helps control system power Lower power reduces or eliminates need for fans

30 Bold Projection Fanless desktop PCs for home and small office will become a significant market demand DDR will help enable this important market segment

31 Another Wild Card Low Power SDR  1.8V  No DLL  Inventive refresh options Some focus here, especially for cell phones… will it spread? Features considered for DDR family, too

32 Cached DRAM Power Profile NOPACTR-PRERRNOP RRRR Lower Power Higher Power Command Activity Page Miss Power Profile Page Hit Power Profile Command Activity … …

33 Conclusions 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

34 Thank You


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