Please Help Me.....Im planning to buy 256mb 8600GT DDR3 256mb 8500GT DDR3 256mb 8600GTS DDR3 WHy 245mb = availability and budget Im using it to a 15" and 17" LCD Monitor Please base the rate or grade it with these criteria Price Power Consumption Speed and Performance Temperature Durability And I want to know if its ok to 256mb for this size of LCD...
They're all crap, and on top of that, none of them are produced any more, so you would have to buy them second hand. Buy a new card in your price range, if you can afford a second hand 8600GTS you can probably afford a new HD4670, which is a vastly better card, or maybe even an HD5670 which is better still.
If you are really gonna to choose one of those then i woulda recommend 256mb 8600GTS DDR3, because it's newest fo those. And 256mb memory is enough for 15" or 17", if i have 64mb graphic ram and it works fine with 17" LCD screen.
Video memory is effectively irrelevant for the desktop. I imagine that question referred to games usage.