I really don't know and always assumed it wasn't, but with amd you never know.
I will try to disable all the saveing options from amd and get back to you.
P.S.-Altough this could be happening, I only get this problem with mindminer. All the other miners I've tested work fine.
Try download 'hwinfo32'. Run in monitoring mode 'sensors'. Look to cpu tempreature, load percentage and throttling.
4 minutes for miners request isnt normal. Or is very low free physical memory or is throttling.