I was going to get a Radeon 6670 GDDR3 for my pc(Pentium Dual-Core E6300 2.80GHz, 4GB RAM and Gigabyte G41M-Combo MOBO) and a friend of mine told me that I should get a Radeon 6770 so I want a second opinion. My budget is about 90 euro and the main purpose of my PC is for gaming(action games,strategic, MOBA mostly).
If your PSU has a PCI-E 6 pin power connector, then the best you can get is the HD 7770 as that also uses little power (much less than even the HD 6770). If you do not have a PCI-E 6 pin power connector, then you will be limited to the HD 7750.
The HD 7770 does cost a bit more but is faster than the 6770 and uses less power and runs cooler. If you want the best possible with your current PSU, then the HD 7770 would be the one to go for.
This site has em going for 95 Euro for the HD 7770.
This is the connector you will need for the HD 7770. Your PSU will either have the 6 pin (The one on the left) or the 6+2 connector (The one one on the right). Either of these connectors will work with the HD 7770. Even if you can't order from there, it should give you an idea how much it cost.
It will tell you that in the details tab. Pretty much all modern PSU's above 400W have at least 1. (For some odd reason, few will not have one, but those are usually the cheapo ones and stay away from those too.)
There has been a situation. They run out of 6770 from the site I ordered the GPU and they said that another solution would be the sapphire 7750 and I want a second opinion. Should I go for the sapphire or should I look for a better one?