I have a Dell Dimension 8100 P4. It came with 2 64MB RDRAM modules and 2 continuity modules. I ordered 2 128MB RDRAM modules to increase my memory to 384MB. I replaced the continuity modules with the 2 128MB modules. On reboot the computer recognized I had a different amount of memory and asked if I wanted to run system setup or continue. I continued. I then checked system settings and it shows I have 256MB not the 384MB I should have. I reseated both new modules. Same thing. All modules are PC800. Why does it not recognize all my memory and what can I do? I'm running WIN ME. Thanks for your help.