The modules themselves should be fine, but it depends on the CPU and OS too..
* Due to OS limitation, when installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Install a 64-bit Windows® OS when you want to install 4GB or more memory on the motherboard.
* AMD AM3 100 and 200 series CPU support up to DDR3 1066MHz.
https://www.asus.com/Motherboards/M4A77TD/specifications/