Benchmarking at over 1GB per second with RAID

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SSD X25-E RAID 5 0 review benchmark SATA SAS

This is a small graphic of the performance that Anandtech's Johan de Gelas has put up, measuring what current RAID arrays can achieve when using a large amount of drives. As you can see, in this particular test, SSD drives from Intel, top the chart, exceeding 1GiB/s when eight of them are used.
This is not a rare occurrence and 16 WD Caviar drives - the regular SATA ones from desktops - also manage the same feat, given the sheer amount of drives used.

Intel's SSDs are especially important when it comes to random writes, as they completely dominate whatever comes in their way:

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Compared to the X25-E, regular hard drives and even 15k RPM SAS drives are no competition. This is unlike most SSDs currently available, notably the ones based in JMicron controllers, where it's average throughput of 0.02MiB/s on random writes is anything but desirable. This is how all SSDs should behave and this will be the future and not just some niche drives - it's unfortunate that it's taking so long to reach mainstream.

For more details, head to Anandtech IT for the SSD vs SAS vs SATA review.