PC guys I need advice (Buying new video card + PSU)

No hard feelings or anything but your pc is not very good even with the upgrades it is pretty low end

I think you should get some more ram at least 6 gb overall ram and a better processor from intel like the i5

Yeah, integrated graphics are only usable for office PCs. I have the same processor and the same amount of RAM and I think your motherboard is also probably a cheap one (I also have the GeForce GTX 550 TI but I can't use it because I need a better power supply :( ) and I think often that my PC is slow. I'll upgrade my PC next year.

You can probably do it, just dont expect to see anything go as smoothly as you may have hoped. Dont say i didnt warn you

I don't know much about this, but take a look here.

And of course, 7770 is a little cheaper.

Too bad you don't live in the states. The 550 is $99 at amazon.

If you do upgrade a second time there will be no improvements in gameplay since your CPU will bottleneck your GPU. Also upgrading a CPU is the most involved and difficult installation process for PCs.

My brother's Gateway PC has a GT 430 (upgraded from a 7600 GS, 1 year ago) with a 300 watt PSU and can run all the games on my steam account fine even most games at 1280x1024 maxed settings at a playable framerate.

Also proof that GT 630 (or a rebranded GT430) will run on a 300 watt PSU

http://www.geforce.com/hardware/desktop-gpus/geforce-gt-630/specifications

Your CPU will bottleneck you in a lot of games.
Which kjnd of games you want/like to play?
I could tell you more then.

You won't use more then 200w with a 7770+Athlon X2, it is absolutely useless to go with 500w, it won't deliver any more performance.

Of course you can buy as much as you want, but it doesnt make any sence, current generations hardware uses less power then the older ones, and it will most likely be the same way in the future, and even then 450w would be more then enough.

No native english speaker, hope its understandable. :)