Hello Prasad.
I have (I hope) a G450 in my system running Mdk 8.0, which I thought
had 32 MB of RAM as well.
I just started Harddrake. Like you, I have seeing it return G400 with
16MB of memory. I'm now concerned. It is a new machine and I have
not tried any highspeed graphics, but I've been told that the Matrox
boards don't have the fastest graphics. For that you need Nvidia or
voodoo. But I'm not "into" graphics yet so I really don't know what
I'm talking about.
Let me know what you find out please. I will also let you what the
manufacterer of my system (Advanced System Labs) says.
Dean