Hi,
SSD in IDE should be little slower agains SSD that is in AHCI.
But why wouldnt you set up those Sata 5 and 6 ports to RAID too??
...That way that single SSD that ain't chosen for any RAID array is runing in AHCI mode.
CPU: AMD FX-8150 MB: ASUS Crosshair V Formula DDR3: 2x4GB G.Skill Sniper DDR3-1866
GPU: ASUS 7970 SSD: 4x Corsair F3 120GB @ Raid0 PSU: SF Golden Silent 500W OS: W7 Ultimate 64bit