And it's quite pointless anyway, any 5 year old PC can emulate the chipset faster than some PCI card..
Faster in raw cpu performance maybe...
Even the most modern pc with winuae wont give as smooth graphics and audio as the real thing does. The audio will actually even be delayed as you have to add some buffering to actually get it to playback without popping and skipping. The gfx will jerk every now and then when a windows process is stealing resources. This would not be the case if you had some chips with the sole purpose of emulating the amiga.