I have a cpu, which has a core 2 quad 2.33 ghz, 4 gb ram 64 bit operating system, it also has 1gb msi geforce 9400 gt card on a 22 inch samsung syncmaster but performance is very poor, all the games i had to play till this date in 4years was in the lowest resolution possible , i want yo play the maximum games possible in h.d all mew games, but due to tight budget i cant go for a oberall upgrade, but i want to know whats the best graphic card i can use, and what power supply unit i would need? Budget can be increased if i get something really good, withouth changing the rest, please advice what can i do?