DDR3 vs. DDR2. Is It Worth The Upgrade?

It is not long ago that we wrote a comparison between DDR2 and DDR RAM. Now, with the launch of the new DDR3 technology, it is high time that we carry out another comparison between DDR3 and DDR2 and decide if it really worth the upgrade from your existing system.

The difference between DDR2 and DDR3

On the appearance, both DDR3 and DDR2 use 240 pins and you can hardly see any differences between them. The only difference is the position of the key notch that prevents users from inserting the wrong type of RAM into their motherboards. The shift in the position of the key notch also means that DDR3 is not compatible with DDR2 and a separate DIMM slot has to be used.


Other than the difference in key notch position, DDR3 RAM is also due to run at a higher frequency than DDR2 RAM. The specification provided by JEDEC provides more insight to its performance.

Official JEDEC Specifications
  DDR 2 DDR3
Transfer Speed 400 – 800 Mbps 800 – 1600 Mbps
Voltage 1.8V +/- 0.1V 1.5V +/- 0.075V
Internal Banks 4 8
Prefetch 4bits 8 bits
Termination Limited All DQ signals
Topology Conventional T Fly-by
CAS Latency 3 – 5 6 – 10
Thermal Sensor No Yes (optional)

When JEDEC set the standard for DDR2 RAM, it never intends to make it run beyond 800MHz. The official specification states that DDR speeds ran to DDR-400, DDR2 from 400 to 800, and DDR3 800 to 1600. Due to the fact that DDR2 800 and 1066 (an overclock version of DDR2 800) exist, DDR3 800 and 1066 will become an overlap speed with that of DDR2. As such, it will only be 1333 that is the first DDR3 speed to have better frequency/speed performance over the DDR2 RAM.

While the difference between DDR and DDR2 RAM lies in the doubling of the frequency bus, the DDR3 works by doubling the prefetch data. This is achieved by doubling the internal bank to 8. Each internal bank can process 1 bit of data. DDR2 SDRAM have only 4 internal banks and process 4-bit samples, DDR3 SDRAM uses 8 internal banks to carry out 8-bit prefetch. The impact of the additional internal banks means that the DDR3 SDRAM could double the data transfer rate without having to make modifications to the original design.

Another advantage of DDR3 is the reduced voltage requirement. The required voltage for DDR3 is 1.5V, a 16% reduction of the DDR2 1.8V. This could translate to a 30% reduction in power consumption compared with DDR2 RAM operating at the same speed. Additional built-in power conservation features with DDR3 include partial refresh and thermal sensor that could allow the system to save further power by providing minimum refresh cycles when the system is not in high performance mode.

A point that requires attention and that brings DDR2 RAM back to the game is the price of the DDR3 RAM. A 1GB DDR3 1066MHz RAM is currently selling at over $200, which is double the price of a 1GB DDR2 1066MHz RAM. While there is no significant improvement of the DDR3-1066 RAM over DDR2-1066 RAM, there really isn’t any compelling reason to upgrade your current DDR2 RAM.


In the near future, it is inevitable that DDR3 is going to replace DDR2 as the standard for memory RAM. At this current moment, the hefty price hardly make it a ‘must-upgrade’ component, considering that you can get a DDR2 RAM operating at the same speed for under $150. Until the time when higher speed DDR3 RAM are more readily available and the price fall to a reasonable range that is comparable to DDR2, it is better to remain with your DDR2 RAM.


DDR3 Ram! Is it worth ? - WCCFtech.com on October 7th, 2008, 6:02 pm  

[…] to a reasonable range that is comparable to DDR2, it is better to remain with your DDR2 RAM. source -peace stickman! __________________ _________ "If every basketball player worked as hard […]

rascilon on June 12th, 2009, 11:05 am  

Imagine a business with 500 computers running 2 GB of DDR2 RAM each, so a total pool of 1000 GB of DDR RAM. At what threshold does the power savings meet the elevated price-point of DDR3?

xpanba on July 22nd, 2009, 11:04 am  


Plzz suggest appropriate Laptop - TechEnclave on August 7th, 2009, 2:04 pm  

[…] Posted by macchi12345 also how much diff. between ddr2 and ddr3 ram? DDR3 vs DDR2 RAM. Is It Worth The Upgrade? […]

nitya nanda das on August 21st, 2009, 1:33 am  

i dont think it is working so nicely as it should be,,,,because i hav bought the acer 5738z laptop today and i think ddr3 doesnt worth being invented…..i am foolled

rather-be-anon on October 6th, 2009, 4:31 pm  

DDR3 is going to be fully mainstream soon, so its better to upgrade when you can, you also need a ddr3 compatable motherboard so if anyones thinking about buying a new pc i reckon DDR3 is the way to go,
even if it does cost £££!

Need Computer Help? - Mitsubishi Eclipse Forums on November 1st, 2009, 5:45 am  

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