to quote myself from nVnews
[speculation]nV releases the nV40 first.
if nV40> 3 quad R420 then ATi releases the 4 quad version as the pro and the 3 quad as the np.
if nV40</= 3quad R420 then ATi release it as the pro and a 2quad version as the np[/speculation]
In either case clock speeds can still be tweaked to set performance goals in relation to the competitors card.
plus in the second case they would then have a revision for when nV releases the nV45 PCIE card
[speculation]nV releases the nV40 first.
if nV40> 3 quad R420 then ATi releases the 4 quad version as the pro and the 3 quad as the np.
if nV40</= 3quad R420 then ATi release it as the pro and a 2quad version as the np[/speculation]
In either case clock speeds can still be tweaked to set performance goals in relation to the competitors card.
plus in the second case they would then have a revision for when nV releases the nV45 PCIE card