8GB RAM, (3.44 usable)

[lordyo97]

No, I am not using 32-bit OS.

 

Was running just fine on Windows 7 Pro(had ~7GB available cuz of APU), but when I upgraded to Windows 10 Pro now I get only half of which i used to get, and it is running in single channel rather than in dual channel.

I got AMD A10-7870k APU and 8GB Patriot Viper 1866mhz DDR3 RAM.(2x4GB kit)

 

[Mason_Brasher]

In your BIOS see if you can change the amount that your APU can use. Though, usually the max is 2 GB. 

[lordyo97]

Opened BIOS, but couldn't find it anywhere, max shared memory my APU can use is 2GB, maybe that is not the problem