Ive got a 3ware 9650se 15-disk raid6 with 4gb of ram. 16gb is a bit much for a storage device imo, but like Tom said if you are doing fancy stuff then maybe you will need it. iometer gives me about 112mb/s both read and write with a single intel pro 1000 MT on both ends.
also, i wonder if you are getting that kind of performance because you have so much memory.. aka the cache effect, you should try writing files larger than your memory or just take a bit out for testing so you can see what your storage system can do without the aid of RAM from the system.
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