According to Matrox's web site, both the G450 and G550 still only have 230MHz RAMDACs on the secondary head.

Woops! You're right! The main difference between the G400 and the G450 was that the secondary Ramdac was now also integerated, but it was still slower than the first Ramdac.

I must have it confused with some other card, though I can't think of any card of which the two video outputs are powered by an equally powerful ramdac. It's either that or I really must stop sniffing glue.

Anyway, I stopped buying matrox cards with my G400Max. I still got the card, in fact it's the one I'm using right now. A great card in every aspect, but somewhat lacking now in the 3D area (what do you expect from a card that's 2.5 years old), but I still think it's the best card Matrox has procuced to date.
It's really sad to see what has become of a company that was once regarded as the producer of some of the best video cards in the world...