One man's opinion:
1) Forget about RAID 0. It's a way of linking two or more drives together to make a bigger drive with higher transfer rates, longer seek times, and less reliability.
2) On the other hand, you can use a controller card with SATA III ports to control your SSD. The data transfer speed is not limited by the chipset, but rather by the number of PCI Express lanes that the card takes up.
On the other hand, not all controller cards can be used for boot devices.
3) If you can afford it, replace the motherboard instead.
Otherwise, you need a card with at least two lanes if your mobo supports PCI-E 2.x, or four if your mobo supports PCI-E 1.x I've never used one, so I can't give a recommendation.
EDIT: Your motherboard has only one PCI-E x16 slot, which you are probably using for graphics, and one PCI-E x1 slot. x1 is about 4 Gbit/sec, a little faster than SATA II but not as fast as SATA III. So you would still be limited.