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+There are several classic problems related to memory on Linux
+systems.
+
+        1) There are some motherboards that will not cache above
+           a certain quantity of memory.  If you have one of these
+           motherboards, your system will be SLOWER, not faster
+           as you add more memory.  Consider exchanging your 
+           motherboard.
+
+All of these problems can be addressed with the "mem=XXXM" boot option
+(where XXX is the size of RAM to use in megabytes).  
+It can also tell Linux to use less memory than is actually installed.
+If you use "mem=" on a machine with PCI, consider using "memmap=" to avoid
+physical address space collisions.
+
+See the documentation of your boot loader (LILO, grub, loadlin, etc.) about
+how to pass options to the kernel.
+
+There are other memory problems which Linux cannot deal with.  Random
+corruption of memory is usually a sign of serious hardware trouble.
+Try:
+
+        * Reducing memory settings in the BIOS to the most conservative 
+          timings.
+
+        * Adding a cooling fan.
+
+        * Not overclocking your CPU.
+
+        * Having the memory tested in a memory tester or exchanged
+          with the vendor. Consider testing it with memtest86 yourself.
+        
+        * Exchanging your CPU, cache, or motherboard for one that works.