Serial ATA performance
Moving to Serial ATA, we tested performance with a Western Digital Raptor WD360GD SATA hard drive. Again, we used HD Tach 3.01's 8MB zone test.

South bridge Serial ATA performance is consistent, but the RDX200's Silicon Image SATA controller scores quite poorly in the burst and write speed tests. We've seen poor PCI performance from the SB450 in the past. Given the fact that the Sil 3114 rides the PCI bus, it's likely that the ATI south bridge is to blame here.