Question regarding H55 based 1156 motherboards

Hey guys.

Am building yet another PC for a friend, and I'm scratching my head when looking at the motherboard options. The budget is limited, so I had to look on the lower-end scale.

I have some doubts about some features on the H55 chipset, and as much as I've looked on the internet, I just couldn't find a reasonable explanation. So, here come the questions:

1.) Raid 0 on H55 chipsets - is it possible or not? The build will include two hdd's, which, ideally, should be run in RAID 0. I know the P55 chipset supports this, but unsure about the H55. I've set my eyes on Asrock's H55M PRO motherboard, which seems to offer quite a bit for the money, and has gotten positive reviews. However, I can't find any information about RAID support, not even on the Asrock homepage here:

http://www.asrock.com/mb/overview.asp?Model=H55M%20Pro

If it does not support RAID 0, how much of a performance loss would this mean for the hard drive speeds?

2.) The Asrock motherboard has two PCI-E 2.0 slots, one running at 16x, the other at 4x. As far as I know, when using a Crossfire configuration, the difference in speed between 16x/4x and 8x/8x is insignificant when using a single display. Most motherboards in this price-range offer one PCI-E slot, or two in 16x/4x combination, those that offer 16x/16x or 8x/8x costs twice as much, or more. Is the investment worthwhile?

3.) Overclocking on H55. What are the chances of overclocking an I3 - 540 CPU from 3.06 to 4+ GHZ speeds? I don't think the chipset of the mobo should limit this, but it's better to ask

Thanks in advance for any input.