The thing with Haswell I experienced is that not always 124 is Vcore, for instance I had not enough Vccin and Vring and got 124 errors.
101 supposed to be Vcore but I am not sure about that. I could solve 124 errors sometimes using more Vcore but sometimes more Vrin/Vring.
That is what makes it so time consuming. There are so many possibilities with Vrin,Vcore,Vring and LLC. And this is only if your Ram is Ok otherwise you can add SA and VccioD/A.
Even more possibilities. I also experienced the right amounts of Vrin and Vring were important to obtain stability. Wrong Vrin/llc or wrong Vring can mess up stability.
Edited by Alxx - 9/20/13 at 12:14pm