That was due to driver limitations with 5.0, which roughly matches the cuda version one would install.

Let me try to sum it up it for now, you guys may add what I already forgot about:
- driver 5.0 ea/rc worked for us (hypnos)
- 5.0 release had ECC false negatives (taurus)
- 5.5 or 6.0 ea/rc worked again (on hypnos?)

Whatever, we could change this to "use 5.0+" of CUDA and use driver version XYZ (check the latest 6.0 or what we have now on taurus)