I did my first SSD RAID on my Saphire PureBlack Mobo with the I7-970 in it.
I went a bit OTT and I also put 2x3TB WD BLACK HDs for D: and then I used a pair of RX380 Cards in to crossfire them, and coupled with 6 sticks of 8GB RAM so it was actually a fairly decent PC. I have since given it to a mate and its still running the same setup as it had when I knocked it up!
Admittedly, the SSD Drives were not the fastest, but it still made enough of a difference as they were only 40GB Inlte jobs and so as striped, it helped both speed and size.
Since then, I have done a fair few knock-ups and I have had varying levels of success.
Motherboards dont have proper RAID as such ( None of mine do at least ) but I have a couple of RAID Cards that do, and they are vastly superior to do it with, so if you are going to do SSD RAID to boot and your Mobo isnt the best, then consider going with a RAID card.
That said, I have recently been introduced to M2 Cards, and my main machine has an M2 slot and its seriously quick... Leaves even my fastest SSD RAID setup standing.
But hey, SSDs have dropped in price so much, that it is now simply not possible to be so cheap that you dont have even one to boot with. with 120GB Drives are under £30, Even people who have never heard of money, can afford one.
Hell, I just bought 4 the other day purely to play with them and with next day delivery the whole thing was under a ton.