What HDMI output versions does Precision series have?

I am looking to buy a Dell Precision (either M2800, M4800, or M6800). But I need someone to confirm which HDMI versions they have (either 1.4 or 2.0).  I need 2.0. Can anyone help? I tried looking on various places on the Dell site and other sites, and I do not have the time to look further and will buy a Lenovo Thinkpad W541 if I cannot get and answer before this weekend.