External RAID5 Enclosure:
Oyen Digital RS-M4QO
4x Seagate ST31500341AS Barracuda 7200.11
External SSD:
Oyen Digital EB2-S
1x Intel X25-M SSD
XBench benchmark results
Conclusions:
eSATA is ~50% faster than FW800 for large block size reads and writes on RAID5, and large block size reads on the SSD. It's worth picking up an eSATA card if you want peak performance from fast external storage.
A consumer-grade 4-disk RAID5 array can hold its own against an SSD for sequential access, but is much slower for random access. It's worth making your boot drive an SSD, but not worth paying for an SSD for (say) video editing.
If you RAID your SSDs, you have too much money.
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