Please help me fast! GT 630 vs 6670 HD

It won't make so much difference unless you go for something a bit better like 7770 or 7750. But the 6670 is going to almost be the similar as the GT 630.

but the 64 GB/s of bandwidth from the 6670 versus the 17.12 GB/s from the GT 630? I'm not very good at GPU's, but from what I can see, the 6670 has MUCH better specs than the 630.
Also, if there's a huge difference between the 6670 and a GTS 450 1 GB GDDR3(or 5) , I'm considering to buy the GTS 450, even if it's more expensive.
What do you think? Should I keep the GT 630, buy the 6670, or, if there's a huge difference, buy the GTS 450?

What is your budget? Maybe I can help with an overall better card?

umm.. something around 100-120$..

Thats great budget and can get you a GTX 650 if you like nVidia or HD 7770 if you like AMD.

They will destroy the cards you suggested.

Here is a link for HD 7770 at $104 after rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

And here is a link for GTX 650 at $99
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

wow great GPU's, but I have one more question: both GPU's have the 3.0 x16 PCI-e, while my ASROCK K10N78M has the 2.0 x16. Will the gpu work on the motherboard?
edit: I bought my 630 from a store which I dunno if they will refund my money spent. If I'm unlucky, probably I will have to give back the GPU and buy a better gpu from them. A better GPU(GTX 550 TI 1 GB GDDR5) from them costs around 160$, so....

3.0 cards in 2.0+ slot will work at 2.0+. 2.0 cards in older 1.0+ would work at 1.0+ . Simply, all of them are backward compatible. You could run it on PCI-e 1.0 x8; it would be bottlenecked but it would work. But at your case, any single GPU that I suggested won't be bottlenecked by a PCI-e 2.0 x16 slot at all. It should work very smoothly.

And for the GTX 550ti, its already phased out, buy the newer generation 650ti at the same price and a better performance  

Thinking right now to buy the GTX 650 from newegg. I'm from Romania, so I wonder if newegg delivers products to Romania. Maybe it's a dumb question but I never bought anything from them..

I don't think that newegg ship outside USA. But you will find the 650 everywhere on different websites that ship globally like amazon and ebay for example. And I guess ebuyer also ships to Europe. But if I were you, I'd go to the local stores and check it out, it won't be different from the current prices online I believe.

In my country, at the most stores, the price of a GTX 650 IS NOT lower than 160$  

edit: Guess I will have to stick on an Asus Radeon 6670.. Atleast do you think I can run games like Assassin's Creed 3 or BF3 on medium settings smoothly without frustrating FPS drops?

You can find the 650 here on amazon and it ships to romania. Price is around 140 dollars only >> http://www.amazon.co.uk/EVGA-GeForce-GDDR5-Graphics-Car...

If you want to stick with the 6670, it can play BF3 on low smoothly, but it depends on how you define "smooth" because for me, anything below 60 fps is annoying. What about you?

The GTX 650 is much better than it and can make you play on medium with good fps rate  

I'm pretty sure that you will bottleneck real bad with that cpu and ram, honestly.   I'll show you what happened back 5/6 years ago when I went from a AM2 dual core 6400+(3.4ghz) to a lowly Phenom II X3 710(Oc'ed to 3.6). I was severly bottlenecked by the 6400+ to say the least when I ran 2x HD3870's.

http://forums.epicgames.com/threads/680572-HOC-UT3-Benc... First post. Notice I got a nice bit higher FPS at 1080p with the new cpu than I did with the 6400+ at 720p. lol.

Probally time to upgrade the whole system IMO.