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DDR vs. DDR2

post #1 of 4
Thread Starter 
So let me get this right DDR gets 2 clocks and DDR2 gets 4 clocks ... Whats next GDDR3 ram?
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post #2 of 4
Check this >>> http://www.upgradememory.com/DDR1_vs_DDR2_W15.cfm?NBP=1

----

Quote:
The advantage of DDR2 over DDR SDRAM is the ability for much higher clock speeds, due to design improvements. With a clock frequency of 100 MHz, "SDR-SDRAM" will transfer data on every rising edge of the clock pulse, thus achieving an effective 100 MHz data transfer rate. Unlike SDR, both DDR and DDR2 are double pumped; they transfer data on the rising and falling edge of the clock, at points of 0.0 V and 2.5 V (1.8 V for DDR2), achieving an effective rate of 200 MHz (and a theoretical bandwidth of 1.6 GB/s) with the same clock frequency. DDR2's clock frequency is further boosted by electrical interface improvements, on-die termination, prefetch buffers and off-chip drivers. However, latency is greatly increased as a trade-off. DDR2 Prefetch buffer is 4 bits wide, whereas DDR is 2 bits wide & DDR3 is 8 bits wide.

Power savings are achieved primarily due to an improved manufacture process, resulting in a drop in operating voltage (1.8 V compared to DDR's 2.5 V). The lower memory clock frequency could also help — DDR2 can use a real clock frequency 1/2 that of SDRAM whilst maintaining the same bandwidth).
DDR
Quote:
Chip specification
DDR-200: DDR-SDRAM memory chips specified to run at 100 MHz
DDR-266: DDR-SDRAM memory chips specified to run at 133 MHz
DDR-333: DDR-SDRAM memory chips specified to run at 166 MHz
DDR-400: DDR-SDRAM memory chips specified to run at 200 MHz


Stick/module specification
PC-1600: DDR-SDRAM memory module specified to run at 100 MHz using DDR-200 chips, 1.600 GByte/s bandwidth per channel.
PC-2100: DDR-SDRAM memory module specified to run at 133 MHz using DDR-266 chips, 2.133 GByte/s bandwidth per channel
PC-2700: DDR-SDRAM memory module specified to run at 166 MHz using DDR-333 chips, 2.667 GByte/s bandwidth per channel
PC-3200: DDR-SDRAM memory module specified to run at 200 MHz using DDR-400 chips, 3.200 GByte/s bandwidth per channel
DDR2
Quote:
Chips
DDR2-400: DDR-SDRAM memory chips specified to run at 100 MHz, I/O clock at 200 MHz
DDR2-533: DDR-SDRAM memory chips specified to run at 133 MHz, I/O clock at 266 MHz
DDR2-667: DDR-SDRAM memory chips specified to run at 166 MHz, I/O clock at 333 MHz
DDR2-800: DDR-SDRAM memory chips specified to run at 200 MHz, I/O clock at 400 MHz
[edit]

Sticks/Modules
PC2-3200: DDR2-SDRAM memory stick specified to run at 200 MHz using DDR2-400 chips, 3.200 GB/s bandwidth
PC2-4200: DDR2-SDRAM memory stick specified to run at 266 MHz using DDR2-533 chips, 4.267 GB/s bandwidth
PC2-5300: DDR2-SDRAM memory stick specified to run at 333 MHz using DDR2-667 chips, 5.333 GB/s bandwidth
PC2-6400: DDR2-SDRAM memory stick specified to run at 400 MHz using DDR2-800 chips, 6.400 GB/s bandwidth
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post #3 of 4
Thread Starter 
Wow thanks for the information... that helps I guess.... +rep for u
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My System
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Hard DriveOSMonitorPower
200GB Sata1.5 Maxtor Windows XP Home & Ubuntu 19in Flat Panel 400w FSP-PN 
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Xoxide 5 in 1 combo 
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post #4 of 4
Quote:
Originally Posted by guitar22891
So let me get this right DDR gets 2 clocks and DDR2 gets 4 clocks ... Whats next GDDR3 ram?

Video cards are already utilizing GDDR3, and DDR3 for standard RAM is supposed to be out in 2008 IIRC.

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