what exactly produces x10 noise? PSU?
do you get any beep signals from MBD?
if the PSU and all GPUs are safely working I would check the ram memory.

it is probably much better to move this topic to the mining section of this forum. I believe there are more people out there who can help you and they are not visiting this part of the forum
Try here https://bitcointalk.org/index.php?board=76.0