You need at least a pentium II 233 to get good rendering speeds? I vaguely remember.
Be carefull what you're comparing here. If you just say "rendering" it is also a function of the memory speed. And the phoenix/stratix/ddr3 has definitely higher bandwidth than the pentiumII/233 back than. And probably, if you twist Gunnars arm, he will probbaly add something into the phoenix core to shed some light on a triangle?
;-)