What was the old IDE drive, and what is the new SATA drive (hardware-wise)? Also, what mode is that new drive operating in - IDE, AHCI, or RAID? That motherboard in your system specs is an Intel ICH7 chipset, meaning it's not a "full" SATA controller in certain circumstances - it's actually missing some SATA functionality when not in AHCI mode, which would make a SATA drive *very* slow. For example, VMWare ESX supports the use of an ICH7 27c0 controller in an ESX host server, but only for CD-ROM drives

- that's pretty telling for a company that prides itself on it's IOPS performance from disk. Basically, what you've got is a pretty slow SATA controller to begin with, and it's even slower when not in AHCI mode.