I have the 1.6 GHz version, but I may shed some light on your scenario.
Processor speed becomes a bottleneck if you have to perform a lot of logic/complex operations on data. I cannot really say for your case whether your AV functionality requires a lot of cpu effort, or whether it is just serving files. I tend to think the latter one.
In that case, the harddisk and I/O will definitely be the bottleneck. Performance is not bad, considering it is a 2.5" 5400 RPM disk:
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$ sudo hdparm -tT /dev/sda1
/dev/sda1:
Timing cached reads: 1120 MB in 2.00 seconds = 559.73 MB/sec
Timing buffered disk reads: 182 MB in 3.01 seconds = 60.40 MB/sec
Compare that to my workstation, with relatively new disk in RAID 0:
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$ sudo hdparm -tT /dev/mapper/isw_bjgiaehihi_Outback1
/dev/mapper/isw_bjgiaehihi_Outback1:
Timing cached reads: 7592 MB in 2.00 seconds = 3798.63 MB/sec
Timing buffered disk reads: 498 MB in 3.01 seconds = 165.55 MB/sec
Concluding, FitPC2 is good for serving a small number of users simultaneously [Google uses a different setup
]. It is up to you to estimate the usage profile, and wether you need scaling possibilities if usage goes up (like you cannot upgrade the memory of FitPC2).
