Different size ram...is it bad?

[Dr Seuss]

Right now I have 12gb of ram in my pc, 1 8gb stick and 1 4gb. While I'm playing games, it lags occasionally, specifically during firefights (in fps games) and I'm trying to figure out why. My cpu isn't running too heavy and my gpu is only at like 60%. I wondered if having odd sizes and brands of ram will affect my performance...is this possible?

 

[Haro]

1 hour ago, Dr Seuss said:

Right now I have 12gb of ram in my pc, 1 8gb stick and 1 4gb. While I'm playing games, it lags occasionally, specifically during firefights (in fps games) and I'm trying to figure out why. My cpu isn't running too heavy and my gpu is only at like 60%. I wondered if having odd sizes and brands of ram will affect my performance...is this possible?

 

Depends 

What cl latency are both sticks running at