I dont think PCI was a good choice on the A1200, I had the LT4 version and sure you could run a 1600x1200 WB, but running fast scrolling graphics on the Workbench was slower than regular AGA in 4 colors. For example, scrolling in Ibrowse felt laggy and this was with a 060 board. If you wonder what I am talking about, play a module in Hippoplayer and enable any hipposcope. Watch hipposcope run in slo-mo.
As I was told this is because of how memory is shuffled to the GFX-board on the A1200. I was told that on on a Z3 system this issue is gone.
Another nice detail about a loaded PCI system is that the Amiga will use around 100w if it is pumped to the max (PPC/060/Mediator loaded system).
Hmm.. I bet you had some config issue rather. IBrowse scrolls just fine on my A1200/060/MediatorZIV/Voodoo3 with 1600x1200 at least.
I think PCI is the best thing happened for expanding the A1200. It's really fast compared to other options. Zorro2 was horribly slow for any gfx operations, Zorro3 busboards were hacky, unstable and expensive for accelerators.
