What's the difference between an AGP and PCI video card? W/c gives better graphics, a 256mb DDR3 or 512mb DDR2

I assume you mean AGP vs PCIe (PCI express) card. PCI video cards are only installed on old computers. Between AGP and PCI, AGP is significantly better.

Between AGP and PCIe: AGP has 1x, 2x, 4x, and 8x connection speed to the motherboard. PCIe has 16x, which is faster.

Finally, the amount of RAM on your graphics card (both specs are great) will only make a difference is the game you are playing downloads a ton of texture files to the graphics card. For every game I have run across so far, 512MB does not actually give you better game experience than a 256. Video card vendors are supplying these outrageous RAM amounts as most buyers don't know that this large quantity of RAM is actually not used by the game. Finally, DDR3 is faster than DDR2, so might improve your framerate a bit.

Between the two, if they were the same price, I'd go with the 256.|||512 mb DDR2. it will provide good graphics and is stable.|||AGP cards will only fit in AGP slots and PCI cards will only fit in PCI slots. And I'll assume you're talking about PCI Express and not PCI, in which case PCI-E cards will only fit in PCI-E slots. PCI is older than AGP, which is older than PCI-E.



As for RAM, smaller amounts of faster ram will give better performance, but you may not be able to run games at quality settings that require large amounts of video memory.|||the difference between agp is the speedof this bus is just 8x while PCI bus is the speed is 16x, its like moving on an 16 lane express way on ur system. PCI is the more speed. next question DDR3 256 is equivalent to 512 of your DDR2. the difference is that DDR3 256 is the newest among the memory expansions.