drkohler on 22 November 2008
Please note that the graph that is shown above is not correct as it "beautifies" the situation for XDR. Currently, XDR ram can be as fast as GDDR5 ram. An actual comparison of both ram architectures is difficult as it depends on many factors (bus width/bus clock/"deepness of the XDR"). The main advantage of XDR is its lower power consumption (and possibly less data/address lines depending on implementation).
If you really want to know about XDR, got to the rambus website and read.
If you really want to know about cell architecture, go to IBM website (much of what errorrr wrote is more or less incorrect).
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