Half-correct. He started off by saying that the iGPU sometimes interferes with overclocking AMD cards, but he also said later on that sometimes a dummy plug needs to be used to fool the card into thinking a monitor is attached, and that turned out to be the solution for me.
How many GPU do you have? Because if you hav to buy a Dummy plug for all GPU gona cost a lot...
Right now I have (3) RX 560 with (1) more on the way. Given the boosts in hashrate of ~8% for Ethash to ~11% for Cryptonight per card with the dummy plug attached each plug will pay for itself in 30-50 days. Seems like a good tradeoff to me.
