hi, i idearly want a gaming pc but as i cant afford one i have decided to upgrade me nvidia geforce 9500 GT with 1gb if i remember right. what would be best for me as i do alot of simulation games i.e shipsim/train sim/flight sim and so on. i have an amd athlon II X4 640 processor and 4 gb ram on windows 7 ultimate. want to try and get 6 or 8 gb ram but i thing at a time thanks in advance tommy