I wanted to ask whether upgrading just my from ATI Radeon HD 4870 graphics card to ATI Radeon HD 5870. Then please suggest me the exact process that help to fix this issue. Then please suggest your own thoughts. The Intel Core 2 Duo E8400 processor is to be present on this system. I hope many of the users have already do this task. Then please suggest your own experience about this issue. Thanks in advance.