That's over 30% load increase. The worst case would be that you smoke the on-board voltage regulator (VR) and/or circuit traces (The little copper lines on your motherboard). I would keep a close eye on the VR temperature but 125W is 125W. If you have been running a CPU with that load, stands to reason you could continue. But, keep in mind that a processor rated 125W doesn't draw 125W all the time. That's peak at full load. At idle, a CPU may only draw 2-4W.