Hello,i bought an hd 6670 but coz many people say nvidia is best tell me which nvidia card at around 5-6k inr or 100 $ performs like an hd 6670.dont tell me one card give me all the cards that are around the same performance price.
Nvidia doesn't have much low end offerings that is really good. Radeon HD7750 is around $100 or lower. There is a GTX650 which is around $100 as well but it needs a 6-pin power connector indicating it uses slightly higher power. Not a bad alternative though if you found the GTX650 is cheaper than the 7750. After that, the HD6670 is definitely next best choice. Don't get any cards lower than the 6670 for gaming, you'll most probably be disappointed.
What version of 6670 do you have ddr3 or gddr5 ? If it is a gddr5 it is right under the hd 7750 gddr5 standard edition. 650ti is a good choice as well but i would wait for a 7770. Around 100 dollars us after rebate. You will notice a big jump in fps