Latitude E6430 NVS 5200M performance problem

I just bought Dell Latitude E6430 with NVS 5200M and its performance is really poor, only 2300pts in 3D Mark06 and on integrated HD4000 I'm getting 4900pts. Updating video drivers, system and switching off Optimus in BIOS isn't changing anything. According to many tests found on internet it should be minumum 7300pts (to 10000+) on NVS 5200, but I can't find out what's wrong. Same problem on Windows 7 and after updating to Windows 10, the integrated video card is much faster than Nvidia... Any suggestions?