thanks for the replies guys .. erm..well im using the m4a785td v evo mobo .. and i hav a dual channel ram slot..
What you do is go to the ASUS support website http://support.asus.com/download/download.aspx?SLanguage=en-us
Under General Download select motherboard under select product,Select Socket AM2/AM2+/AM3 under select series and then select your M4A785TD-V EVO under select models.A pop up will appear to select your operating system.Once selected it will show the downloads.
Click on the + sign under Qualified Vendors List It will show the M4A785TD-V EVO Memory QVL.Then download the file,be sure to save it and open it up.
The QVL memory could also be in your motherboards manual as well.
It will tell you everything that you need to know.