I decided to compare the nominal clock speed (1333MHz) and make sure that my PC uses a 3rd generation (3DDR) memory type. It also confirmed that my Windows 10 OS was 64-bit (not 32-bit) so it could address all 16GB of memory. These are important points for beginners trying to improve their memory. After unlocking and removing the two old cards (1GB and 2GB), the new cards fit perfectly. My computer is much, much faster.
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