I installed an additional 128 megs f sdram in a computer that already had 64 megs of sdram the new memory is 133Mhz. The computer is 4 year old Quantex with a Pentium II 300Mhz processor. When I check the memory is only shows 128 megs not 192megs as I expected. I did not remove any memory. The computer has 4 memory slots, two of which were filled. I added the 128 megs to the third slot. the fourth slot is still empty. Any ideas on how to get the missing 64 megs functioning? Thanks.