New 8 GB memory shows 2 blank slots

Hi,
I have a 27" imac i5 quad core that i bought in January & it came with 4 gb memory. I purchased 2x 4 gb modules from Crucial for a hopeful total of 12gb. when adding memory I left the 2x gb memory that came with machine in the top slots & added the 2 4gb modules in bottom slots. When starting machine back up it showed 1 slot with 2gb & 1 slot with 4gb for a total of only 6gb when I should have had 12gb total. we then switched the bottom 4gb modules position left to right & it show different positions of still the same total of only 6gb. Am I doing something wrong. I pushed them in very firmly. They do sit out slightly more then the Apple memory, but I figured it was due to the brand differences.

Never mind I figured it out. I had to replace the top Apple modules to the bottom position & put the new Crucial memeory in the top position & it worked.

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