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D a ta R a te [M b p s ], C o r e F r e q [M H z ]

D a ta R a te [M b p s ], C o r e F r e q [M H z ]

DDRx I/F - DRAM Core Freq Gap

2400

2000

2.5V

2133

2.5

1600

VDD

1.8V

Data Rate

n=8

2.0

V D D [V ]

400

200

0

100

400

400

200

100

1 2 0 0 n = ( D a t a R a t e ) ( C o r e F r e q )

=> (Prefetch size)

800

n=2

DDR1

n=4

DDR2

1.5V

1066

800

Core Freq.

266

100

DDR3

266

1.5

GDDRx I/F - DRAM Core Freq Gap

7000

6000

2.5V

Prefetch n=8 with Bank interleaving

2.5

VDD

Data Rate

5000

1.8V

2.0

4000

1.5V

1.5

3000

(Data Rate) n = —————(Core Freq)

n=8

=> (Prefetch size)

n=4

2000

n=4

Core Freq.

1000

n=2

0

GDDR1 GDDR2 GDDR3 GDDR4 GDDR5

Figure 9 DRAM and High-Speed I/O Trends

©Copyright 2011 ISSCC

V D D [V ]

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