turboflame :
http://en.wikipedia.org/wiki/GeForce_FX_Series
Add to that...
GF6, GF7.... which were both slower than their later counterparts but about even at launch.
nVidia wasn't the top end of the pile until the GF8, before that it was the GF4.
Except..... when used in SLI, and thus the reason for the dual GPU cards which as mentioned is primarily for the Halo effect, and which is very effective, hence all the effort spent on SLi and Xfire, etc.
If nV can't get the G300 on a single slot (which seems a safe bet for the launch die until they shrink the process), then you will likely once again see ATi having something in the lead from top to bottom, like they did once the 4870X2 was launched.
The most important thing is how long it takes nV to get their mid-range DX11 out, and from the looks of things, that may be late Q1 or early Q2 2010.