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.
The performance delta here from the top to bottom is only around 15MB/s. The P55A-UD7 sits almost right in the middle at 8.9MB/s behind the leader. Not a bad showing at all.
Everest serves to confirm our findings. The P55A-UD7 is right where it should be in terms of HDD performance.