[soundboy35]

Thanks Slim.
I really wanted the speed of FW800, but I could try chaining it:

MPB FW800-FW800 port on drive (no 400 available), out drive FW800 using FW800-FW400 cable, then 400 cable to FW400 in of 003r.

Any experience with those express cards?
You don't think it's an issue of the external monitor? Just want to rule that out.

I don't do many sessions over 30 tracks, but this thing is barely doing 24!

Are you running PT8.x?