Upgrading video card on computer?

I was looking at two computers first one is



http://www.bestbuy.com/site/HP+-+Pavilio…





And second is



http://www.bestbuy.com/site/eMachines+-+…



my main concern is that they both have terrible video cards and i would like to do some gaming(team fortress 2,borderlands,brink when it comes out) so i was wondering if on number 1 i could swap the radeon hd 3000 with a radeon hd 5450. My second question is if i would be able to swap the GeForce 6150 se on the second with a GeForce GT240. If i am able to do both the swaps then i will buy the one with the geforce. What do you guys think about the rest of the computer(number 2).|||On computer 1, you only have one available expansion slot, and it's only a PCIe x1... so no you cant upgrade basically anything on that one.



As for the second computer, it's still not compatible. The card is PCIe 2.0 x16, and the motherboard only has PCIe 1.0 x16.



If you already have a monitor, keyboard, and mouse, get this setup:



Case - http://www.newegg.com/Product/Product.as…



Motherboard - http://www.newegg.com/Product/Product.as…



CPU - http://www.newegg.com/Product/Product.as…



Video Card - http://www.newegg.com/Product/Product.as…



RAM - http://www.newegg.com/Product/Product.as…



DVD Drive - http://www.newegg.com/Product/Product.as…



Hard Drive - http://www.newegg.com/Product/Product.as…





Yes it is about $125 more than the second one, but it allows for better upgrading if you're ever in the mood (you can upgrade from i3 3.2 GHz dual core, to i7 3.4 GHz quad core, as well as a few other things), and it can even run Crysis 2 on medium-high settings.|||ok one thing you need to buy the computer open it up and see if it has a pcie x16 2.0 port and im pretty sure it doesent





and this is what i suggest you get if your looking for price range

form 70 to 100 bucks

http://www.newegg.com/Product/Product.as…



higher price 150 to 200

http://www.newegg.com/Product/Product.as…