Nvidia GTX 660 Mhz Limited when rendering

[Scottlocks]

SO every so often, i do a few renders in Blender. The last one i did took 9 HOURS to finish, nearly 2X the time it took before with the same setting and number of polys. I loaded GPUz and found out my GPU is limiting its speed to 549Mhz and not the full 1033Mhz. GPUz says its a "Util" limitation. GPU usage is/was at 100%. Im using the Cycles render in blender. my rig specs are below

CPU: Intel Core i5 3570K
GPU: Nvidia Gigabyte GTX 660 OC
Mobo: Asus P8Z77-V LK
Ram: 16GB Cosair XMS3(4X4GB) @ 1600Mhz
Monitor 1: Asus FULL HD
Monitor 2: Acer 1600X900
PSU: Cosair HX750Watt(750 Watts)

all hooked up to a CyberPower 810Watt UPS.

 

[iam2thecrowe]

http://www.overclock.net/t/1267918/guide-nvidia-inspector-gtx670-680-disable-boost-fixed-clock-speed-undervolting

follow this guide, create the .bat files as suggested. I have the same issue with crysis 2 sometimes dropping my clock like that until i reboot. I just use the nvidia inspector bat files now, just remember to change clock speed and voltages from the template to whatever your stock card clocks are, or you can overclock.