Just downloaded the manual for your board and it appears that the AMD 700 series chipset provides the Esata port so you need to download the AMD Chipset Driver V1.3.0.49 under the Chipset tab.
In your main bios screen there is a tab labelled E-Sata. Plug your E-sata drive in and switch it on. Boot up and go into the bios. Is the drive being detected in that tab. If not click on the tab and make sure it's not disabled. If it is enable it, save the bios (F10) and reboot. It should be accessable now.
If it still does'nt work then it may be a good idea to update to the latest bios. Download it to a usb stick, reboot the pc, either hit Alt + F2 at startup or just go into the bios and run EZ-Flash 2 to update. Under no circumstances do it in Windows!!