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MEMORY TECHNOLOGY FOR SMALL FORM FACTOR SYSTEMS

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Presentation on theme: "MEMORY TECHNOLOGY FOR SMALL FORM FACTOR SYSTEMS"— 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
DIMM SO-DIMM MicroDIMM 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 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

7 Comparing DDR Memory Modules

8 DDR Modules SO-DIMM DIMM NEW! MicroDIMM

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

10 FlexATX Footprint With DIMM: 17k mm2 With SO-DIMM: 7k mm2
North Bridge Copper Slots With DIMM: 17k mm2 With SO-DIMM: 7k mm2 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 Vertical Socket Right Angle Socket 3U

13 Which do you think will run the fastest?
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 Of course, no one will make the move unless
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 Interconnect fabric and I/O
High Density 1U Mem CPU CPU Mem Mem CPU CPU Mem Interconnect fabric and I/O Mem CPU CPU Mem CPU CPU Mem 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

25

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

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

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
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

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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