burner66 :
I have an ASUS RADEON R7 240 WITH 2Gb memory and have looked at the monitor supplied with it and it never uses one bit of memory why?. Not a heavy gamer only have FSX/ACC right now.
Did you monitor the usage while playing a game? Have you tried monitoring the usage with Afterburner or another tool?
If it is zero while playing games then something is wrong with the tool. Also, you will never use the full 2GB in games because the card is simply too slow for that. You would probably get the exact same performance if you only had 1GB.