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Innovations in Memory Technology for Compact Systems: A Shift Towards DDR SO-DIMM

This presentation by Bill Gervasi, Chairman of JEDEC, addresses the evolving landscape of memory technology in small form factor systems. As desktop PCs shrink, the need for efficient memory solutions becomes critical. The emergence of DDR SO-DIMM modules meets the demand for high-performance, low-cost memory in compact designs. With trends favoring 1U servers and better heat dissipation, the focus is on integrating more CPUs while minimizing noise and energy consumption. The move towards DDR SO-DIMM will redefine memory in desktops, offering significant advantages for fanless designs.

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Innovations in Memory Technology for Compact Systems: A Shift Towards DDR SO-DIMM

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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 Designsand Form Factors

  4. Combine market segments

  5. It’s Time for a Change • PC demand plateau at 128-256 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. Comparing DDR Memory Modules

  7. DDR Modules SO-DIMM DIMM NEW! MicroDIMM

  8. SO- and Micro- DIMMs DDR DIMM = 133.3 mm DDR SO-DIMM = 67.6 mm = 50% shorter! DDR MicroDIMM = 45.5 mm = 66% shorter!!!

  9. FlexATX Footprint North Bridge Copper Slots With DIMM: 17k mm2 With SO-DIMM: 7k mm2 Area saved~ 60%

  10. Server Market 1U form factor or blade600 MHz x86 CPU256MB – 1GB RAM (by unit shipment; source = Intel)

  11. 1U Thin and 3U Blades 1U Right Angle Socket Vertical Socket 3U

  12. 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?

  13. Matching Requirements and Implementations

  14. 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

  15. Concept Under Analysis

  16. 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

  17. 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

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

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

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

  21. 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…

  22. Heat & Noise

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

  24. 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

  25. Power: DDR vs SDR Lower Voltage meansLower Power PC133 (3.3V) 2.0X PC100 (3.3V) 1.2X DDR266 (2.5V) 1.0X

  26. Power: DDR vs SDR Double the Bandwidth yet Lower Power DDR266 1.0X PC100 .31X PC133 .25X

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

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

  29. 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

  30. Cached DRAM Power Profile Higher Power Page Miss Power Profile … NOP ACT R-PRE R … R NOP Command Activity Page Hit Power Profile Lower Power NOP R R R R NOP Command Activity

  31. 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

  32. Thank You

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