I want to power 2 GPUs form 1 GPU slot.
My question is will that be safe for the PSU. Can i burn the GPU slot of the PSU if i power 2 GPUs and their risers.

I have 10 X Rx580 the miner shows avg. 92-100 W. The total system  consumes about 1250W at the wall so it must be about the real consumption of the GPUs that is show with PhoenixMiner.

As i understand from your reply one GPU slot of the PSU can handle up to 300W . This is enough for 2X RX580.

So i just need to make sure that the cable is good and i can power 2 GPUS from one slot of the PSU?