Lines going across the screen

[PaperPlunger]

What is video ram?
What is gpu?
What is an overclock?

1) RAM on your video card
2) Graphics Processing Unit, same thing as a CPU (Which is a processor, BUT NOT A COMPUTER)
3) Running something above it's factory settings.

 

[dude_se]

1) the amount of memory on your video card eg; 128mb
2) its your video card

thats easier to understand