Solved

DDR2 800 vs DDR3 1333

Hello,
I am planning to replace my 3 year old computer. Currently my e6750 runs on DDR2 800 with CAS 5.
Since I'm planning to get the i7-870, I was looking at 1333Mhz sticks.
Can someone tell me if this calculation is any good:
800Mhz CAS4 = 1/400 = 2.5ns/tick = 12.5ns/transfer

1333Mhz CAS 9 = 1/666 = 1.5ns/tick = 13.5ns/transfer

I find it very hard to believe that DDR2 beats DDR3. So what am I missing here !?
4 answers Last reply Best Answer
More about ddr2 ddr3 1333
  1. Best answer
    You are comparing low latency DDR2 with high latency DDR3. It would be more fair to compare your old RAM with Cas 7 DDR3-1333. There might be some archetecture advantages also. In any case the jump from DDR2 to DDR3 is not that big of a deal. You also dont have any choice so it doesnt really matter.
  2. http://en.wikipedia.org/wiki/CAS_latency - see the additional links for more.

    It looks like your math is close, but as dndhatcher points out, 800 MHz CAS 4 is pretty much top of the line DDR2, while 1333 MHz CAS 9 DDR3 are bargain bin sticks (mostly). Comparing to CAS 6 or CAS 7 would be a more appropriate comparison.
  3. Oops, I mistyped Cas4. It's supposed to be Cas5 (as reflected by the math).

    Thanks for the quick replies. I could've sworn I spent about the same $$ 3 years ago for the 800Mhz sticks. I guess this side of technology did not progress that much.
  4. Best answer selected by divac.
Ask a new question

Read More

Homebuilt DDR2 DDR3 Computer Systems