Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I was reading the specs of ati radeon 5770 ddr5, and I noticed it's 128 bit (Please correct me if I am wrong). Does it mean it has no added benefit compared to cards that have 256 bit but are ddr3? (I am only asking you to consider ddr3/ddr5 aspect)

share|improve this question

This is a trade between bus size and memory clock

A 448 bit bus on the GT260 with GDDR3. (Bandwidth 111.9 GiB/s)
Is as adequate as.
A 256 bit bus on a HD4870 with GDDR5. (Bandwidth 115.2 GiB/s)

in reality they are not directly comparable by memory type/bus, for solid compassion you should check out the reviews of this GPU.

There are many other factors that impact the speed of a GPU such as memory latency and on GPU cache that they dont advertize that are just as important.

share|improve this answer
could you kindly post link to any articles that discuss what you mentioned? – TPR Aug 23 '11 at 6:51

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.