GTX Titan is very slow


I have been experiencing very low performance from any CUDA codes lately. Even the samples are very slow, ‘Aligned Types’ gives me 1GB/s speed on both Titan (instead of around 100GB/s on another workstation). I don’t really know how to troubleshoot this problem since everything works but very slowly. Things used to work fine yesterday and i have not installed any updates since.

My setup is the following:
Windows 7 - VS2008 SP1 - 2x GTX Titan - Cuda 5.5 - Drivers 320.57

Any help is apreciated.