Help me, you can do?

Users questions: Processor: Intel pentium (Pentium) 42.80GHz. Motherboard: Intel D865PERL (Intel 82865G * PE * P, 82848P). Memory: 1GB (DATA DDR400MHz). Main hard disk: Seagate ST380013A S (80GB). Graphics: NVidiaGeForceFX5200 (128mb) CD-ROM: Sony DVDRWDW-G120A (DVD-RAM * DVD +-RW) Sound: Intel 82801EB * ER (ICH5 * ICH5R) AC97Audio. NIC: ADMTRKAN98310 * 100MBPSPCIadapter * Accton. I play some 3D games, has some cards, and would like to rise about class, do not want to spend too much money, how can I change the economic advantages, for what brand, about How much rice Thank you patiently answers.
Experts answer: 1GBddr400 of adding extra memory. Graphics for 6600gt, the common 2-hand market, can buy. Good 2 million or so. If the rated power supply is not enough, another high. do not change the cpu.
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