I have a P8P67 Pro V3.0 - I have just picked up 4x2tb disks and was looking to use RAID5.
I managed to setup the RAID (not without its issues... broke my Windows installation... apparently a known issue with GPT installs).
However once I booted into Windows and formatted the 5.6TB drive, the performance was nothing short of crap. I could only get a max of 25MB/s, when in single disk mode, can achieve consistently around 120MB/s. (write speed).
Read speed wasn't an issue at over 300MB/s in RAID.
Has anyone else has issues with the on-board raid controller, particularly this chipset model? I know it's not as good as having a dedicated card, but I really didn't expect it to be that terrible.
I did have a read through this article here - but my drives were configured for 4K cluster size and 64k stripe size, which from that table says I should have gotten somewhat decent speeds.