Can I use external USB graphics in my laptop to extend the graphics memory?

[Anurag_92]

I have acer aspire 5740g laptop which has inbuilt 1 gb AMD graphics but I want to extend it.

 

[Anurag_92]

MERGED QUESTION
Question from Anurag_92 : "Can I use external USB graphics in my laptop to extend the graphics memory?"

I have acer aspire 5740g laptop which has inbuilt 1 gb AMD graphics but I want to extend it.