Just because its pin compatable doesn't mean that the bus width stays the same. Look at the FCPGA PIII's and Celeron II's. They are pin compatable - but one has SMP support and the other doesn't. They reserve pins in the socket for future use, and thus the extra pins are not used on the Celerons, but the PIII's use the pins for SMP support. (even though it has been theorized this change is internal to the processor casing, the SMP pins on the Cel II are labeled 'reserved')
It just means that you can drop a G800 into a G450 board and it will work. There are many ways that this can be accomplished - having the chip sense the presence of a signal on a 'reserved' pin and if its one way enable a wider memory bus, if not then use a standardl; having it auto sense the ram attached to it - if you used dual 64bit buses, then it would be able to see that nothing is attached to the second (also compliments of 'reserved' pins) and disable using it - there are countless ways it can happen.
Again, pin compatable means that you could drop a G800 into a G450 board and it would work - it doesn't mean that all of the features would be enabled and used.
While it would be more expensive to do, i think it would worth it if they put dual 64bit mem buses like the G400 - it would help performance and is definatly needed.
And, supposedly the X-Box was running off of nVidia NV25 performance level silicon.
-Luke
It just means that you can drop a G800 into a G450 board and it will work. There are many ways that this can be accomplished - having the chip sense the presence of a signal on a 'reserved' pin and if its one way enable a wider memory bus, if not then use a standardl; having it auto sense the ram attached to it - if you used dual 64bit buses, then it would be able to see that nothing is attached to the second (also compliments of 'reserved' pins) and disable using it - there are countless ways it can happen.
Again, pin compatable means that you could drop a G800 into a G450 board and it would work - it doesn't mean that all of the features would be enabled and used.
While it would be more expensive to do, i think it would worth it if they put dual 64bit mem buses like the G400 - it would help performance and is definatly needed.
And, supposedly the X-Box was running off of nVidia NV25 performance level silicon.
-Luke
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