Basically, having DDR-II will increase the bandwitdh of the card from R300 to R350. I've heard that it might be 256-bit DDR-II. It will provide more effictive bandwidth by lowering latencies and/or increasing effective clockspeed.
RV350 will be a die shrink, possibly with DDR-II, i simply don't know. RV350 and R350 will give NV30 a run for it's money.
No idea what R400 will be, i expect be able to get one by around August.
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