Advantages of Graphic Cards

The main advantage of graphics cards over onboard graphics is "memory usage"
normally onboard or intergrated graphics use some of you system memory to help run applications and games and there are several configurations of this
s.m.a or shared memory architecture is a set up where the graphics chip does not have its own dedicated memory, and instead shares the main system RAM with the CPU and other components
turbocache(nvidia patent) is a method of allowing graphics cards more available framebuffer memory by using both on-board video memory and main system memory. Main memory is accessed using the high-bandwidth PCI-Express bus.this is a technology solely used by nvidia
HyperMemory is ATI Technologies' method of using a PC's main system RAM as part of or all of the video card's framebuffer memory on their line of Radeon video cards and motherboard chipsets. It relies on new fast data transfer mechanisms within PCI Express.
basically the only advantage of a dedicated graphics card over onboard graphics is that your system memory is untouched and when you have onboard graphics it can be misleading when you have 1gb of memory but 128mb of it is borrowed by the onboard graphics,especially when you are trying to run a game that requires 1gb of memory to run correctly
then again the mian advantage of onboard graphics is they dont require a extra power source,however most of the latest graphic cards require a spare power lead(5v 4pin molex or 6pin pci-e connector)

NOtE:

many softwares are available in internet which claims that it can play the high graphic card games ,but that is 100% fake ,dont trust those softwares it may harm your System

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