Pro and Con for Raid with SAS.
I have Adaptec 31205 PCIe x8 running raid0 4x 15k.5. It is extremely annoying when it boots, it takes 50 seconds to start the card and detect disk array. In addition this process must be gone through before I can enter the motherboard bios, can u imagine how difficult it is to make adjustment for overclocking and testing.
After booting into windows, the benchmark is beautiful. HDtech graph is almost straight through out at 300mb/s limit (final average 299.x). Using only 2 hdd will not achieve this.
Not sure about raid0 with onboard SAS in latest x58 board. Thats for 2 hdd only i think.
Don't ever try fancy SAS/SCSI controller on gaming PC, it boots your PC 3 times longer than onboard SATA . Period.