Will my PC run faster?

I think all of those cards are too weak for gaming.

Agreed. These are all entry level video cards and aren't really suitable for gaming.

What is your budget? What resolution will you be gaming at?

What will happen if I put a GeForce GT 430 with a AMD A4-3400 Llano? Will that make it slower?

Resolution is 1600x900. Well I already ordered the Geforce GT 430. I just wanna know what will happen since I have that APU. I can play Skyrim on high textures, AA off because of this mod I installed. And the only games I play are Minecraft, Total War games, Skyrim. I'll only try to play old games on this thing basically.

Not slower. They will work fine together.

I'm going to tell you right now that none of those cards are good at gaming. The 430 is better (the 6450 is a rebadget 5450 so either would be the same) but by no means a good GPU for gaming. It's considered below the lowest that this website will recommend.
http://www.tomshardware.com/reviews/gaming-graphics-car...

+1

Skyrim isn't an old game and I doubt you will be able to play at 1600 x 900 with such a weak card. You might as well use the integrated card, but still, for Skyrim I think it's not recommended at that resolution (others could give their opinion because I don't play Skyrim but I saw the benchmarks and usually you need a good card for this game I believe). If you can stretch your budget a little bit I would get a Radeon 7770 it's a very good bang for the bucks but you need to check if your power supply will support it. Also don't worry it's not too late to cancel your order for the GT 430 just contact the reseller now they might not have shipped it yet and even if they did, most resellers will accept to replace it by another product some of them have a no question asked return policy or even if they don't have such a policy they might accept an exchange anyways, just check with them.

Ok thanks guys. I'll try to return the Gt430 and get a 6670.

I'd recommend the 7750 if you can afford it but if you do get a 6670 then make sure it's the GDDR5 version not the DDR3 version.
6670- http://www.newegg.com/Product/Product.aspx?Item=N82E168...
7750- http://www.newegg.com/Product/Product.aspx?Item=N82E168...

EDIT:
Wrong 7750 that is a bad one with DDR3
this is the correct one.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

That one has 1 GB less. Isn't that worse? GDDR5 1gb is faster than DDR3 2GB?

Wow that's a big mistake I forgot they made a 7750 with DDR3. Do not get what I posted (I'm going to edit and fix it). This is the 7750 you should get.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
GDDR5 is significantly faster than DDR3 and you won't even use the full 1GB nerveless the 2GB of the crappier memory.

Cool, thanks for the help man.

You're welcome, sorry again for that mix up.

The 460 will work with the APU but side by side, not together. So you will be able to have dual monitors without taxing either GPU. So you will have two very low end cards and limited gaming ability though many willplay fine at low.

The APU comes with a 6410 built in and would hybrid-crossfire with a 6450 for what tis worth but its still just <blah> in most games.

About the lowest card capable of ok gaming, IMO, at your resolution would be 7750 which should give you just about 30FPS in alot of games. The 7770 would be a better buy though.

Yes but if he has to spend $10 more for a better card (7770) then also needs a new PSU which is going to set him back another $40. I'd say it isn't worth $50 to go from a 7750 to a 7770.