oclvanityminer: How to reduce CPU/GPU load to avoid system powerdown?

[magpie]

Hi,

I tried oclvanityminer and it leads to my system powering off after a variable short time (2-7 minutes).
I strongly suppose, the program is producing too much load resulting in some component overheat, leading to powerdown.

Is there a way to tell it to reduce it's load impact, like e.g. -f on poclbm?

System:
- Phenom2 X4
- NV GTX 560
- OpenSuse 12.1

Vanitygen package cloned and compiled today.

-S