Battlefield 2142 help

Hey i have been playing battlefield 2142 much lately, and have around 30.000 points, but all my specs are set to low and terrain to medium, i did this so the game won´t crash each time that i play. I was thinking about upgrading my PC so i can set all setting to high i will give my specs here:

i have :

Intel Core Duo 2.40 Ghz

GeForce 6600 (don't know which one)

1024MB Kingston RAM (2x 512, 2 free slots)

now my question was : Are there any bf2142 players who think/know what i need to play it perfectly ??

i was thinking about putting 2x512 extra in and upgrading to GeForce 7900 GTX

thanks in forward

i meant with that that i have been playing a long time on a not very good system.

you say it will run fine but if i set things higher than medium it crashes too often

Do you mean Core 2 Duo, because they never made a desktop Core Duo

I meant the new card will run it fineHot_Potato

oops sorry for my misunderstanding ^^ yeah i kinda had an idea that my GeForce 6600 is the weakest part in my system and also the most outdated, on an other forum i heard that i could better buy an 8800GT than 7900GTX because of the price/performance ? does anyone know if this is true ? (sorry i am a dummy in computer technique)