The HD 6320 is about the equivalent of the integrated video on the Intel Ivy Bridge processors. And your tiny E-450 is not intended for gaming. Having said that, you may get by if you play at the lowest resolutions and lowest settings. Here are the minimum requirements: http://systemrequirementslab.com/cyri/requirements/batman-arkham-asylum/10901/?p=r
My personal feeling is that it won't be playable.
The HD 6320 is about the equivalent of the integrated video on the Intel Ivy Bridge processors. And your tiny E-450 is not intended for gaming. Having said that, you may get by if you play at the lowest resolutions and lowest settings. Here are the minimum requirements: http://systemrequirementslab.com/cyri/requirements/batman-arkham-asylum/10901/?p=r
My personal feeling is that it won't be playable.