The easiest way to determine if it is the processor is by testing it on a 2nd motherboard, but since you already did that, then it seems to be a processor issue.
So in this case I would suggest contacting our customer service center so they can further assist you, and replace the processor if that is the case.
Keep in mind that our warranty is only for boxed retailed processors.
And when contacting our customer service center, please have the processor handy and the model numbers of each motherboard where you tested the processor.
They will ask you for the information on top of the processor as showing here: