I would set up a dual psu, but im not sure how to, have any advice on how i could, or where i can find how to do so?
Im using 2 sticks of that RAM for my main PC, thats why i purchased so much.
It's still a huge overkill. A Sempron 140 and 2GB of RAM is enough for a dedicated mining rig.
As for the dual-PSU, it's just like using one psu, except you using two of them... Two power cables, and twice as many connectors inside.
Spend the money you will save on more mining power!