GPU hangs after secs.

[maxrena]

Hi there,
I am a newbie in mining coin, so I tried to setup a rig myself, and here is my problem.
I am using Asrock H81 Pro BTC Mobo, 4GB RAM, and 6x Asus Rx 480 4GB.
I am using Claymore miner to mine Zcash, but I have a serious problem.
After a couple of secs running, one of 6 GPU will hang and watchdog will reset the rig. It says "OpenCL call, GPU 3 hangs, watchdog will reset"..
I tried so many solutions but no use.
I tried and replace all the Riser - no use.
I think because I didn't plug in 2 4 PIN power connector before, but now even I plug all the power connectors in, problem still exists.
I hope if anyone had this problem before or had experience about this, please help me.

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[Aureliusy]

When I was mining 2013/2014 > I tried to run with 6 cards. Never was stable So I switched to 5 GPU's or 4. Much more stable. Only sometimes fans wold wear out

[e-coinomist]

These are having 150W (TDP) and 6x results in 900W totals, which is lots. You can try two power supplies but handcranking that up into a running state is tedious. We have a Mining (Altcoins) https://bitcointalk.org/index.php?board=160.0 section where the up-to-date people hangout. There was some circuitry to launch 2nd power-supply signaled from 1st one.