My RAM not working right and slowing down my pc

pigalol

Honorable
Apr 21, 2013
42
0
10,540
I had 2.5gb DDR2 ram(at 667MHz) and it worked perfectly but it got a little slow when i was using 3d soft ware so i decided to get a kingston 2GB ram(1x1@800Mhz). The pc booted up normally and when i use Google chrome it crashes, and when i use to be able to play Mount n Blade at 70 FPS, now i get 10. Help me!