Link to thread one - http://www.gamesas.com/index.php?/topic/1118747-can-my-pc-run-new-vegas/
Also check out this link. Its to 'Can you run it?' - http://www.systemrequirementslab.com/cyri/
Heres everything from the previous thread thanks to CCNA:
To make this easy, if you can run Fallout 3, you can run New Vegas.
Here are the Reccomended Requirements. As you can see, the hardware needed is not bleeding edge, so most modern gaming PCs will have no issues running this game.
http://bethblog.com/index.php/2010/10/01/new-vegas-news-its-done-plus-pc-reqs-and-cake/
As usual, on board graphics (no seperate video card) will not run this game. If you have that, you will have to investigate adding a video card to your current system. There may be some integrated graphics solutions coming that can run modern games, but for now, they are not up to the rendering needed.
If you have any doubts, please post what you have here and we will make a educated guess based on what we know about how Fallout 3 runs. However, this educated guess will be pretty accurate.
All other Hardware Threads will be closed and directed to this one.