I'm currently using a store bought machine and just ordered a 4830 512MB to replace the integrated 6150 LE. I also ordered 2GB of RAM and a better CPU, but those are basically self explanatory. I replace the CPU, and I just shove in the 2GB of RAM. With the GPU however, I'm not sure what I have to do to the integrated nVidia before installing the dedicated ATI... such as going into the bios and disabling the integrated? Or uninstalling the drivers completely with software?