You may not need a separate pci controller, only "IF" your board has the requisite (usually "software" based) controller chip on board. RTFM!
Raid0 is usually not worth the greater data loss risk for its minimal performance increase. Raid0+1 , 5 are better choices...most important is the purpose/use of the pc, as not all uses will benefit from the slight performance increase a hardware card with ample ram will afford.
If only for braggin' rights then the preceding doesnt matter so much....