Upgrading from GeForce 8400GT to Radeon HD 4650

hi guys, i am having a trouble upgrading one of my customers video card,
he has a nvidia 8400 before, and when we tried to upgrade from 8400 to 8700 the video wont work, thats why i recommended to change the video card to radeon ati. will that replacement work? havent yet tried to install the ati, we will be doing it on tuesday, hope nothing wrong will happen
 
There is no particular reason the Radeon card shouldn't work provided everything else is working and up to the task. You should uninstall the old Nvidia drivers, of course.
 
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