Cause I think to remember the SDR version on those early mainboards were already quite "heavy" on the bus, that's in an interesting PCB layout. I wonder if other manufacturer built the card without it cause there was still space for the power requirement or close to some limit.
About the above test it'd be interesting to know wich CPU actually surpassed the original Geforce hw T&L speed using sw T&L/MMX/3DNow!/SSE. On the 8 lights test I think to remember old reviews were talking about the impact final results had with that test. I wonder if it's simply too much for the "first GPU" and how much it was increased on the Geforce2 GTS.