There are various GPU based miner available in the market, The Mh/s for the same will depend on the graphic cards used in the miner, If your planning to build your own mining then the procedure can be little complicated if your new in mining. I would suggest you to go for a ready available miner.
If you are looking for serious mining and if you have some good technical knowledge then building up a mining rig would be easier or else it would be just waste of funds .there are some mining rigs which are readily available in the market which gives good performance , just came across one few days a go Promax 7 GPU miner .
As per the details mentioned on the Promax 7 site they have come up with three miners and the mh/s generated by each are as follows for the 7.1 the mh/s is 1830 , 7.2 is 3710 Mh/s and G7 is giving 600 Mh/s .
Graphics Processing Unit GPU based mining is becoming a popular trend in the world. But know this, it is a very expensive thing to plant. It costs about $26000 to mine a single Bitcoin in South Korea. Still thinking of GPU?
There are various GPU miner available on the market. If you want to start mining cryptcourrency, then you should be able to cope with the costs. The hardware is expensive and the electricity costs are very high. You also need to cope with the operating costs.
Before going into the business of Crypocurrency Mining, you should be aware that it requires a lot of patience and determination. Many people are under the assumption that cryptocurrency is a guaranteed thing to earn profits. They need to see the ground reality.