Will my pc run this??

What is your power supply and motherboard make and model number(s).

I'm at work right now i will have to get back to you on that. I dont know the specs bye heart. I bought this from my friend. I just know its a AMD duel core, NVIDEA GeForce 8400gt card, power supply and motherboard...again I will post later.

Try this:

http://www.systemrequirementslab.com/cyri/

I have no idea about Skyrim, but Battlefield 3 isn't going to run on an 8400GT, that video card is incredibly weak and BF3 is one of the most graphically demanding games out. BF3 should run on a 6570 with low settings and a low resolution, but the experience won't be the greatest.

Depending on what AMD Dual Core you have, you may or may not be able to run the game. Minimum is an Athlon X2 5800 or so, and online multiplayer gets more cpu demanding as player counts increase.

I don't think either Skyrim or BF3 has any chance of working on an 8400GT.

Might as well not even try it.

6570 has a better chance of playing it on low settings.

A HD 5830 is about the cheapest thing I would try to play those games on.

I just got a Radeon HD 6770. A friend of mine said it should work fine.
Here is my specs.....
AMD Athlon 64 X2 dual core 4000+ 2.10 GHz
4 gb memory

ok well i was putting in the new graphics card and my monitor wont show anything. will it not run if it doesnt have the right power supply?

well prob not, you did hook up the power cord to the gpu (if it has it) also drivers and what not..

if the system isnt booting then you may not have enought power for it, tell us the brand and model of the powersupply, also the specs would be nice

i have a dynex 300w dx-ps power supply
the graphics card is a Radeon HD 6770
I installed the card and when i turned on my comp my monitor is black. nothing comes up

Dynex 300w is pretty weak. I would go for a 500-600w in one of these brands: antec, corsair, seasonic, enermax, xfx, or ocz. The corsair builder's series and antec are reasonably priced.

so is that why nothing is coming up on the monitor? i cant even get to the desktop to install the drivers

If you're getting windows to load with your old video card, then the new one may need a special connector your dynex ps doesn't have, plus more juice to power up.

6770 recommends a 500w or greater Power Supply... you need a bigger Power supply... it will not run at all unless you do.

ok i see thx