Your friend is correct, you should not mix ram.
What you want is a kit 2x?
2x4GB or 2x8GB.
Very few games can use more than 8GB of ram.
Hey fellow members.
I am new to the forums and I know absolutely nothing about computers. But a friend told me mixing ram is dangerous so I do not know what to do now. To play a game I got. I need the minimum of 10 Ram I already tried playing it its not going perefctly. I currently have 6gigs of ram. I orderd another one to replace one of the 3 sticks seeing i only have 2 ram slots on my pc. But then a friend told me mixing ram is dangerous and I should just order a whole kit. I just canceld the order of corsair vengance ram what do you guys suggest just buying a kit of 16 gigs or do you think i can mix this