Graphics card lagging-up my games?

So I've been wondering why my games have been lagging, missing frames and the likes.
It can't be my RAM (4GB Kingston),
or my processor Core i7 870 2.93 Ghz.
As the motherboard has nothing to do with it so I've drawn the line at my HD Radeon 4350 1 GB dedicated RAM graphics card.

Is this a good card?

Will buying a new graphics card solve my troubles?
Cause I can't play much and it's getting really tedious playing games in sluggish slowmotion. And yes I have updated all my drivers for my graphics card.

Cheers!
- Labrat
Dedicated gamer and novice novelist.
 
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