How to start Thief (2014) 64bit with Mantle enabled?

How to start Thief (2014) 64bit with Mantle enabled? - White Mug on Red Background

I've recently got Thief (2014 version, on Steam) and I got a pc that can run 64bit executables and use the AMD Mantle technology but if I try to start the game without the 32bit mode I just get a black screen for few seconds and then it quit to desktop without any visible error or problem.

Any of you had this error and managed to use the 64bit version with Mantle enabled?

My graphic card is a HD 7900, according to the specifics I should be able to run Mantle just fine.

Thank you to all in advance!






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Configure x360ce for Thief 2014 Master Thief Edition on Windows 7 64-bit




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