Thecus n4200 NAS: dual core atom, 1.6ghz, 1G ram, 4x samsung 5400rpm SATA disk, linux softraid5.

root@127.0.0.1:~# hdparm -Tt /dev/md1

/dev/md1:
 Timing cached reads:   2964 MB in  2.00 seconds = 1482.89 MB/sec
 Timing buffered disk reads:  948 MB in  3.00 seconds = 315.65 MB/sec

And one disk:
root@127.0.0.1:~# hdparm -Tt /dev/sdb

/dev/sdb:
 Timing cached reads:   2960 MB in  2.00 seconds = 1480.03 MB/sec
 Timing buffered disk reads:  406 MB in  3.01 seconds = 134.84 MB/sec

Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: SAMSUNG HD204UI  Rev: 1AQ1
  Type:   Direct-Access                    ANSI  SCSI revision: 05
  Thecus: Tray:2 Disk:sdb Model:SAMSUNG HD204UI  Rev:1AQ1 Removable:0