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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)

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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.

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