[newbie] memory not all used

[Gregory S. Hackman]

Hi,

I recently installed Mandrake 6.0 and it only uses 64 Mb of the 256 Mb
installed.  The PC is a PIII (Gateway) with two 2940 SCSI cards.  I'm using
whatever kernel comes with Mandrake 6.0, I don't know how to figure out
which one that is.

Is there an easy solution to this or am I doomed?  I intend to use this PC
as a major number-crunching workstation so I'd like to use all the memory I
paid for.

thanks...Greg Hackman