I dont care, simple cuz, all elecronic systems stream data, the only diference is that the PS2 streams it faster than anything else (in terms of porportion comparing 4Mb of Vram from the PS2 to 4Mb of the unifyed ram from Xbox) the PS2 would stream faster, but since Xbox has more mem, it doenst need high speed like 4Mb vram sync@ clock frequency with the EE.
I dunno whats the timelenght of 1 clock cycle of the EE(nanoseconds!!!), and how much bits(128/2= 64bits I/O? i guess since the system is all 128 bits) can it stream peer clock, supposing it can stream 2*64 I/O, its simple, multiply the number of bits per clock by the frequency that the EE is runing at(146.7mhz? 150 ok) and wwe get the bandwith that the VRam can stream, but since it has to "upstream" and "downdtream" (i mean it has to write, since data its being constantly altered) data, it depends, but divided it by 2, and we get the amount of mem we can see on screen.
(This is only my "calculations" based on what i read and learn)
For a more simple example, take sdram at 100mhz, shure it has a 100mhz bandwith frequency, but it has to write and erase data constantly, so by theory it only uses half th bandwith to Write and erase data. (It may suffer sligh changes)
ppffffeeuu.... im of to chew something, hmmm cake....:d