hello, i'm new here and i'm looking for some info. i used to be pretty tech savvy but the plethora of products these days makes my head squirm. i want to make the most of my system without spending too much, but i dont know what to do. this is what i have: dell dimension 8200 p4 1900mhz, 512mb RD Ram. i dont know the motherboard or the socket, 80gb hd. i have a creative audigy 2 mp3, and a radeon 9800 (not pro, whatever that means). i am interested in overclocking, or possibly upgrading the processor, but i dont know what other processors would fit. i want more memory and i know that rambus requires two maching sticks. i believe i have 4 slots (2 are occupied with one 256 mb stick each). are different speed modules compatible? for example could i put two 512 sticks of a faster speed in the other two slots? or would i be better off pulling those out and replacing them with the bigger faster memory? or will the faster memory even work at all? basically, i want to know where i can go from here..what are my options. i'm happy with the video and sound cards, but the processor is slow and i believe the memory is lacking. thanks for your help.