OpenGL version

Hi,

Early 2007 MacPro with OSX 10.7.5.

Looking the OpenGL version via the System profiler for version it says: 1.8=
.1.

If I connect to a Linux host and look what that Xwindow client says about m=
y machine's OpenGL version, I get this:

OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: NVIDIA GeForce 7300 GT OpenGL Engine
OpenGL version string: 1.4 (2.1 NVIDIA-7.4.1)

So the question is how the Linux machine decides that it is version 1.4 and=
 not 1.8.1 ?  Otherwise it correctly states what GPU do I have in my Mac.

Other question:  What can I do to my machine, or to the Linux machine, so t=
hat the glxinfo on the Linux machine reports me back minimum Version 1.5 ?

Thanks ahead,

J=E1nos