Double Data Rate (DDR) SDRAM and Rambus

Todays (02.Oct.2001) Prices for 1 GByte DDR SDRAM: ca. 200,- Euro,

1 GByte PC800 Rambus memory: ca. 530,- Euro

(both 4 x 256 MB modules)

DDR SDRAM (free spec): Utilizing both rising and falling edges of the clock

8 Bytes * 2 * clock rate

Clock rate

Bandwidth

GB/s

100

133

167

200

1.0

1.6

2.1

2.7

3.2

RAMBUS (license): Direct RDRAM, 16-bit data path, 8-bit control bus, also utilizing both rising and falling edges of the clock,

800 MHz * 2 Byte = 1.6 GB/s

Dual channel : 3.2 GB/s (XEON, P4)