Some motheboards will include an 8 pin adapter, or you can buy one separately. If your motherboard came with 4 of the 8 pins covered, then you will be OK with just installing 4 pins. If the motherboard will be used for overclocking then the cover should be removed, and all 8 pins filled. You can do this with a molex to 4 pin adapter, or some other adapter that will combine with your existing 4 pin lead. Read the mobo manual to be certain of what you need to do.
I used that motherboard in a HTPC I built for the in-laws and uses an Antec EarthWatts 380W PSU. It only included the 4-pin CPU +12V connector and has worked flawlessly without an 4+4/8-pin EPS. For this motherboard, you're safe using only a 4-pin connector.
As others have said though, I'd recommend a different PSU unit. Quality is lacking of pre-included units.