I recently had problems with my 6600 GT. Still under warranty the supplier replaced it with the 7300. Since then I have had constant difficulties and hardware conflicts. my system: AMD Athlon 64 Processor 3700+, 2.2 Gigahertz with 1 GB of Ram. Windows XP service pack2. Is there any known problems with compatibility regarding my system and the Nvidia geforce 7300 GT?? Example of problems: Despite loading loads of codecs I cant run a single video file that used to work fine when I had the 6600 GT (prior to its unknown fault of course). Another example: I have difficulty changing screen settings etc.. If anyone could be of assistance it would be greatly appreciated. I would also like to know which is the better card and why (in laymen's terms preferably), I have a suspicion my pc company is taking advantage of my ignorance. Thank you very much for your time reading this.