While this makes sense, you have to consider the recent history as well. The way I remember it( I could be wrong), Nvidia was preparing the GTX 3xx line-up against the 5XXX series, however, when the number started showing on sites they freaked out, canceling their plan altogether and jumping to 4xx series instead.
Seems to me they went to a marathon just to be able to dump the GF100 asap and finally have an answer. They want the crown and the 3xx series wasn't cutting to it. If you look at the 460 now, it's probably what the gf100 should have been in terms of performance/power/heat.
I don't think it went that way at all.
3xx is just a name, like 4xx.
I don't think it has any relation to what the underlying hardware is.
Also, as been discussed many times before, chip design is a process of years, and you can't 'respond' to what a competitor does, and suddenly come out with a new architecture in a few months time. It doesn't work that way. You don't even want to TRY and respond. You get into issues like the mythical man-month, and all that.
GF100 is probably what was originally rumoured as the 3xx series (which was a reasonable assumption, given that they named their current products the 2xx series... but nVidia decided otherwise... then again, they also renamed the 8800GT/GTS G92-based products to 9800 series... and we all know how different those chips were... A marketing name doesn't mean anything).
