I assume you mean you have the Asus M5A88-M motherboard. The AMD SB850 chipset supports a total of six SATA 3 6Gb/s ssd's.
rolli59 is correct. Simply use the SATA cable that came with your motherboard and you'll be fine.
BTW - According to the international standard there is no difference between a SATA 1, SATA 2, or SATA 3 cables. They are all identical. It was done on purpose so manufacturers would not have to produce a bunch of different cables each with its own unique configuration. If you see a cable advertised as a SATA 3 cable just think of it as exaggerated advertising.