The bigger the RAM size, the better the performance. This is a universal rule that never changes. In today technology, a laptop with 512MB is the minimum, 1GB is the norm and 2GB is great. A very important pointer: never compromise with your RAM.
This is what makes the cer predator x27 gaming laptop different from the normal laptop. If you have the intention to play a 3D intensive game, a laptop with good video card must be your top priority. Most laptop comes with onboard graphics. You must be prepared to dish out extra cash to get the one with great graphics processing capability. ATI's Mobility Radeon X1600 offers high quality graphics.
This affects your gaming experience. A 12' screen is too small for comfortable game play. A good screen size is 15' - 17'. If you are getting a wide screen LCD panel, you might experience image stretching or elongation which might affect the gaming quality. Check the image quality before you make your purchase.