Graphics cards are very cheap these days, even a $50 card would be much better than using the onboard graphics.
The graphics processor should already be in use if your driver is installed. if the driver is not installed then you can download and install it from the respective processor brand.
A CPU assists when loading fresh video settings and processes data required to aid graphics functions.
Accelerated Graphics Processor
To make graphics processing faster adding more physical RAM will help. The best fix is to add a specific graphics card with a large amount of RAM and a fast processor.
Graphics card, hands down
It has a motherboard-integrated graphics chipset by Intel: Intel Graphics Media Accelerator 4500MHD
The graphic settings on games such as WOW and Crisis 2 do depend more on your graphics card rather than your processor speed :)
Allows graphics processor to easily upgraded
graphics processing unit
the graphics processor
Macs do have video cards. For example the current range of iMacs have: ▪ 20-inch and 24-inch model with 2.66GHz processor has the NVIDIA GeForce 9400M graphics processor with 256MB of DDR3 SDRAM shared with main memory ▪ 24-inch model with 2.93GHz processor has one of the following: NVIDIA GeForce GT 120 graphics processor with 256MB of GDDR3 memory or NVIDIA GeForce GT 130 graphics processor with 512MB of GDDR3 memory or ATI Radeon HD 4850 graphics processor with 512MB of GDDR3 memory ▪ 24-inch model with 3.06GHz processor has one of the following: NVIDIA GeForce GT 130 graphics processor with 512MB of GDDR3 memory or ATI Radeon HD 4850 graphics processor with 512MB of GDDR3 memory
Intel's new Core i3, i5, and i7 processors combine a graphics processor with the computer's main processor chip. This results in better video performance without an additional graphics card.