Well its possible yes, but normally it shouldn't be a problem. You wrote: "Sometimes my pc freeze during the game"
Do you play just one Game, does it freeze up only on one Game or on various Games? Have you tried some Benchmark and load tools?
If just one Game is freezing up while others run fine, I wouldn't mind so much, some Games just tend todo this, no matter how flawless your System is built.
If you really believe it's the Ram, just try to run it with 1 of the Rams removed