a10-7800 memory compatibility Geil Evo veloce

You want to look at the motherboard. Go to the motherboard manufacturer’s website and choose your motherboard in the support section.
Then find Memory Compatibility list. Its also a good idea to read the CPU Compatibility list as well, just so you know, its not really required.
Give me the name and model of your motherboard.
 
Fast, Dual Channel and High Amounts of memory are craved by the AMD APU's. So instead of the GPU having its own dedicated memory it shares memory and bandwidth with the normal system memory. This is why speed of DDR3-2400, Lowest CAS you can afford, and highest capacity you can afford all go a long ways in taking a subpar AMD APU and getting it to perform closer to Intels i3's.