Disk Drive Controller
The system drive controller is an important part of system performance. In most modern boards your drive controller will run off of the PCI-e bus. The PCI-e bus performance can be affected by poor trace layout as well as many other design choices that show up on different boards.
For testing we use Sisoft's Sandra and Everest.
HDD performance is right around where we would expect it and at these speeds you are not really going to notice a difference of 2-3MB/s anyway.
Again, HDD speed is where it needs to be.