I think you mean Amiga AA+ chipset, which only existed on paper but would give fixes for all the problems/omissions of AGA like chunky mode, faster pixel clock, even faster blitting and 16bit 4 channel sound. Also facility to read 1.76mb HD floppies.
I don't think reading the 1.76mb HD floppies had anything to do with that. My A4000 will do that, and I'm pretty sure it's not the AA+ chipset...
Amiga had got to the stage that Sony got to in this console generation, they caved in and bought an off the shelf GPU from Nvidia from PC graphics card technology. Commodore would have had to do the same and just optimise it with better motherboard design compared to PCs of 1992. (Which is why the xbox 360 for $200 out guns a $1000 PC even now...clever motherboard design).
I'd have to say a lot of that has nothing to do with clever motherboard design, it has more to do with having no major operating system overhead. Not to mention since a console is a standard piece of hardware, unlike a PC that has all sorts of variations, the developers can optimize the hell out of their code to make it run faster.
slaapliedje
