spider40 :
In performance of games, which is more important
A good RAM or A good Graphic Card
Please answer
Both are important, but GPU moreso than ram. plenty of ram is needed so your system doesn't transfer data to the swap file on the HD (which is slow), the GPU enables high settings (res/ingame settings/graphical goodness.)
The recommended ram for a modern system playing games like BF4 is 8gb. If you have that, then your good to go. Faster ram will have an impact, but not as much as you might think. As Krishna has said, a good GPU is important. More important than the ram, specially for gaming. A good CPU is needed to power your GPU though.
The thing is, it's really about balance. Having enough ram (at whatever speed, providing it matches your CPU defaults), a good CPU (preferably a quad core) and a good GPU too. If You have all 3 of those and you have a pretty good system, which should be able to play games very well.