The ATI 5470
Intel HD Graphics will ALWAYS be worse than any dedicated graphics card. The HD 5470 is better.
Sapphire HD 5450 is better than Sapphire HD 6450 .
radeon 5450
yes you could because i have it and the same computer
I heard a 5450 graphics card would fit perfect, i'll be back later when i get it and install it
Short answer: no.
yes there are and there can be
The GeForce GTX 580 is either the best or the 2nd best graphics card
Depends on the Graphics card with the PC
The computer has a graphic by the graphic card, (video card) the better one you have the better graphics you have. HD 3550 is better than HD 750. So more the number on the graphics card the better yours is. Or it might be in the option and turn up the graphics. It might lag if you have a ok one, but turn down if it starts to lag. And eventually you can find one that suits your graphics card.
You cannot but if on computer it might be better if you have a graphics card.
They're both horrible laptop gaming chips but the x700 will give you better performance.