hi guys, it's my first post here, so bear with me, also i'm kind of a newbie in mining.

i've got a couple of RX 470 4Gb mining cards and i did what the first post said and setup everything right, also i'm using awesome miner for making everything easier to do, so the problem is when i start the miner, it starts with 16-18 Mhash and it automatically goes up to about 22 Mhash after about 30-50 seconds and awesome miner gives about 2.4$ revenue for each card a day, but after about 10-15 minutes, it start to go down to 1.8$ a day, without any drop of Hash rate!!

what's wrong here? can anyone tell me?

also i'm using the 21.2.3 driver, the latest driver does not work at all.