XServe RAID connected to Video Editing Station via Ethernet -Fibre question

I'm looking into switching from ethernet connections from our three desktop systems to the Xserve Raid set up we currently have to fibre. I can't seem to get a clear answer as to if it is possible to just add the cards and cables to the switch we have or if I would have to go the XSAN route in order to have fibre as the direct connection to the RAIDs...
I'm a photographer, not an IT person so please feel free to speak down to my level... : )

In theory GigE ether allows for 1000 Mb/s with a theoretical throughput of 125MB/s and 2GB Fibre is about 70% faster than that at 1700 Mb/s with 212.5 MB/s of throughput.
Now the big differences are that TCP/IP is not optimized for steady stream delivery and you're sharing the connection over a single server that works to schedule fairly and parcel out resources among users. Fibre is a single connection designed to stream data to you so you get to use a lot more of your fibre bandwidth then you do over GigE. At this point the 7 drive array is not able to saturate the fibre so you won't test the theoretical limits of the bandwidth because of the headroom in the system. At max throughput I would expect the drives are putting out something in the range of ~100-130MB/s so even with a direct connection that is your max.
If I was forced to guesstimate I would think you would be getting somewhere between 3-4x faster throughput over fibre. You're certainly more likely to hit the upper-limit of max drive output over fibre so if you say you're getting 100 MB/s over fibre and 25 MB/s over ether then that's about right. If your ether is <20MB/s then it's theoretically possible you could see a 5-6x improvement. Maybe you should test your ether with some transfers and see what your through-put is to make your own estimations.
If an 80GB file takes 55 minutes that then that's about 25MB/s. If you could bring that down by a factor of 3 then that would be 36 minutes of saved - and hopefully billable - time. But if you're getting 40 MB/s a 80GB file would take 35 minutes and then your max savings is probably 15 or 20 minutes and it becomes less compelling depending on how many times a day you do it.
+You've been very generous with your time answering all of my questions, thank you again.+
You're welcome, hope it all works out for you,
=Tod
PS Remember that large single files get much better throughput than many small files on transfer tests. Also you might want to do your own math on what time = what throughput too. Those numbers were off the top of my head.

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