SynthAxe(RME tech support USA) told me there is no benefit of using fw800 w/ the FF,unless you are using multiple IO's
I guess FW800 technology might have a performance benefit if you are using FW800 hard drives,I use an older Mac w/ a slow FW buss so I to keep the use of FW as simple as possible.
From my understanding if the FF is your only IO as well as only FW device in the system 400 is all you need.
Metric Halo issued this great article on FW technology you might want to read : http://www.mhsecure.com/technotes/Te...10/TN_0010.php 
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2.8 Quad Intel(2008)MacPro24 gig ram,OSX10.68, DP7.24, RME fireface 800,Great River ME-1NV preamp,Rode NTK and AT4033 microphones,NI Komplete 5&6,Spectrasonics IK etc and many more VI's and plugs... Vdrums (TD20 expanded) Superior 2 etc..., XP30,Akai Z8, Focal Twin 6 monitors, Shunyata PowerSnakes and Conditioners,too many hard drives... ESATA |