PCI, PCI-e Mesa and EMC2

Thanks for all the help form the experts here, this is all beginning to make sense.

When choosing a computer mother board to run with a Mesa 5I23 FPGA based PCI Anything I/O card, I see that mother boards may have some combination of PCI and PCI-e slots.

Looking at the Mesa site, it isn't clear to me if the 5I23 requires PCI, PCI-e or if either will be fine.

The reason I am concerned is if things go well with 3 axis, I will want to add a second 5i23 later to control two more axis (the machine has 5 axis of servos) and want to be sure that the board has enough of the correct type slots.

For most servos it will be so fast it doesn't matter > 1 MHz with filtering on
This is 6000 RPM with a 2500 line encoder (10000 counts/turn)
With filtering off count rate will be around 3 MHz max so 18,000 RPM with the same encoder

For high speed spindles (> 18000 RPM) you would need to chose a lower resolution encoder

Note that normally the encoder itself will be the limiting factor, very few count higher than 1 MHz or so.

Forgot to say: the 5I23 is PCI