RAM on its own is usually not the solution to poor graphics quality; a good idea would be to check out your graphics card. Just because you have 256 megs of RAM on your graphics card doesn't mean a thing; on the contrair, there are several 128 MB cards that outperform the 256.
What you want to check out is the memory type, memory interface, the memory clock, and the core clock.
Memory Type - SD, DDR, DDR2, DDR3 - DDR3 is a gamers dreams. Anything less than DDR2 is wimping out.
Memory Interface - 64 Bit, 128 Bit, 256 Bit - 256 is the best, drastic performance increase.
Memory / Core Clock - important too, these are what several gamers overclock - getting something with 400 Mhz Core clock and 1 Ghz memory clock should be sufficient for most modern games.
You might also want to check out the open GL version, pixel shading capabilities, AA filtering, etc... simple things that can really make a game look better, not so performance-effecting.
Video cards are one of the fastest growing computer technologies at the moment, and so a video card even a year old can become fairly obsolete when it comes to top-notch new games.
As for the RAM - 133 is extremely slow this day and age, so you might want to consider upgrading your system... one stick of 128 DDR2 333 could match 768 MB SDRAM 133... and probably outperform. Its vital that you upgrade all aspects of the system, because leaving one piece of hardware behind will drag everything else down - it all works as one large integrated circuit, so if you have slow RAM or CPU - everything else might as well be just as slow.
Hope this is helpful.
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