Upgrading my Display Adapter from NVIDIA to ATI Radeon on a Lenovo 740 all-in-one?

I'm not good at this type of thing, but I do need to upgrade to a better display. I want to upgrade my default Display adapter (and card?) …

FROM:

NVIDIDA GeForce GT 630 if you need that) (driver?) on a Lenovo all-in-one desktop:

TO:

ATI Radeon HD 5670.

2 questions:

1. Can I do this without upgrading the video card? (sorry if this is a dumb question). NVIDIA maxes out at 1920x1080. I need the 2560x1440 that ATI Radeon one offers.

2. Can a Lenovo A-series all in one 740 model even accommodate the above driver and/or video card that I want? I don't know about "bus" issues, motherboard, etc.

LMFAO! Wow you are stupid!
How or why would you want to install something you never even seen