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.
Yup, as we knew (and not only because we did the testing), the RIIIG has slower than expected HDD performance. This accounts for the lackluster HyperPi showing and will also potentially hurt it in tests like PCMark, AutoGK and Lightwave 3D.
Stock HDD Performance
Overclocked HDD Performance
Stock USB 3.0 Performance
Overclocked USB 3.0 Performance
Everest again shows us the same thing we knew with more detail. The CPU utilization time is much higher than it should be. This is probably something that can be fixed with a firmware update, though, so it is not too troublesome.