This is Bay Trail platform but I did not find this cpu model listed in the links. You probably want to check with the Intel® Driver Update Utility or from the computer manufacturer’s website.
https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=23162
I think it supports Pixel Shader 5 because of this info:
http://en.wikipedia.org/wiki/List_of_Intel_Atom_microprocessors#.22Bay_Trail-T.22_.2822_nm.29
https://support.steampowered.com/kb_article.php?ref=4360-TPJL-2065
Did you check with GPU-Z?