What should i look for in a video card 512mb or the number like 7800 on a geforce card?

my example is

EVGA GeForce 7800 GS CO / 256MB GDDR3 / AGP 8x / DVI / VGA / TV Out / Video Card ($149)



EVGA GeForce 7600 GT Superclocked / 512MB DDR2 / AGP 8x / DVI / VGA / HDTV / Video Card ($186)





as you can see the first one has 256mb but 7800

but the second one has 512mb with 7600



i just can't decide one which is better the higher mb or the numbers of 7800 or 7600



plz tell me which i should look for mb or number and yea thanks alot|||Model number for sure--mostly.



Deciphering Nvidia's numbers isn't that tough:



Take 7600 vs 7800



The first number : 7 means it uses a 7th generation chip



The second number : 6 or 8 is its place in the lineup. a "1" means onboard and super slow. A 2-4 means low end card. A 5-6 means okay for casual gaming. An 8-9 means high end card for more serious gamers.



The third number is usually a '0' or '5' with 0 meaning 1st revision and a '5' refering to an update (usually)



The fourth number is always a '0' to make the number look bigger I suppose.



The GS or GT is how fast it is clocked in its group. A 7600gs is clocked slower than a 7600GT, but a 7800 is still a faster card.



The amount of memory on the card is how much the card can store to process. More memory can determine things like maximum resolution or if a game can run (some games need more memory on the card--never seen one need more than 256mb though). However, it usually doesn't make a huge difference in the speed of a card.



Last thing to look at is the DDR2 vs DDR3. DDR3 is faster for the video card to access so it can process information from it faster. If choosing between a 7800GS with DDR3 and a 7600GT with DDR2 it is a pretty obvious choice to me--



the 7800GS is a faster video card and it has faster memory as well so it should nicely outperform the 7600GT. If the 7600GT was less expensive it would still perform nicely though.|||MB that's for sure but it really has to do with memory one is ddr2 and the other is just newer and 1/2 the memory but is a Gddr3 which is I'm sure faster then ddr2 but how much faster I can't answer that one. Try one return it and try the other, see what one performs better. I would personally go with the higher MB. Not to mention the HDTV ability if that matters to you.