I have 2 M3A79-T Deluxe Motherboards. One has 8G of Patriot memory and the other has 8G of Kingston.
The board with the Patriot memory only sees 4G of memory. I checked it with CPU-Z and the Task Manager.
CPU-Z does show 2G of memory in each slot.
When I ran memtest it also only sees 4G of memory.
I swapped the memory between the boards and still have the same problem.
Both see 8G of Kingston and 4G of Patriot
The Patriot is 6400 and the Kingston is 8500. But not sure that makes a difference.
Memtest ran overnight without a problem.
Was wondering if anyone else has had this problem or knows what the fix is for it.