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XDR vs GDDR Specs & Roadmap

Graphics
Memory Technology

2004 2005 2006

XDR


XDR
2.4 – 3.2Gbps

4 – 4.8Gbps

XDR2
5 – 6.4Gbps

GDDR


GDDR3
1.2 – 1.6Gbps
 
GDDR4
1.6 – 2.4Gbps

  XDR GDDR3
Clock
Frequency

600Mhz

500 – 800Mhz
Max.
Data Rate

2.4 – 3.2Gbps/pin

1.0 – 1.6Gbps
Max.
Bandwidth

6.4GB/s

6.4GB/s
Density
256/512MB

256MB

Signaling

3.2GHz bi-directional differential

1.6GHz bi-directional SSTL
VDD
1.8V

1.8V
Timings
(tRC / tRP / tRCD-R / tRCD-W)

40 / 15 / 12.5 / 2.5ns

52 / 16 / 16 / 16ns


Graphics
Memory Technology

2004 2005 2006

XDR


XDR
2.4 – 3.2Gbps

4 – 4.8Gbps

XDR2
5 – 6.4Gbps

GDDR


GDDR3
1.2 – 1.6Gbps
 
GDDR4
1.6 – 2.4Gbps

  XDR GDDR3
Clock
Frequency

600Mhz

500 – 800Mhz
Max.
Data Rate

2.4 – 3.2Gbps/pin

1.0 – 1.6Gbps
Max.
Bandwidth

6.4GB/s

6.4GB/s
Density
256/512MB

256MB

Signaling

3.2GHz bi-directional differential

1.6GHz bi-directional SSTL
VDD
1.8V

1.8V
Timings
(tRC / tRP / tRCD-R / tRCD-W)

40 / 15 / 12.5 / 2.5ns

52 / 16 / 16 / 16ns

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http://vrzone.com
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