udma ata / 100 controller?

G

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can someone educate me a little here?

I am putting together a system with the abit kt7a-raid mobo which has Raid.
This particular board has 4 ide ports that each support 100mhz bus speed.
What are those pci card controllers for? Look below.

UltraDMA66/100/100Raid Controller ¡PSupport DMA mode 3 / 4
This one was listed at pricewatch.com
Do i need one of these to use the raid features of my mobo?

I havent ordered it yet, its all bookmarked and ready to go with a few clicks though.
I wont bother to list the setup as i dont want to start a pissing contest, but any info on this udma stuff would be great.
thanks for reading this