I am using XP as main os on a Z77 and have several older pc to maintain with XP and ssd .
I think the best performing chipset for xp is the P35/45/55 chipset , basicly i think xp don t handle the new cpu instructions like w7 .
The oldest pc is a intel 875 sata 1 chipset that has no problem with a ssd .They are in ide mode because that is the default setting of that type of motherboard ,so when something happens and the bios resets to default the pc boots with the default setting . Saves me a trip to set the bios correct and the performance impact isn t so terrible on ide . And trim works in IDE mode but not automatic like in W7/8 , that is way you got to buy a ssd with a good tool to manuel trim the ssd . If you make partitions with W7/8 the partitions are aligned properly, XP alignes not good for ssd.
The hostwriting from XP can be real low when disabling some things , always think it is strange that a os hostwrite so much:\