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RAM configuration problem - Dell Precision 3510

I ordered the Precision 3510 laptop with the Intel® Core™ Xeon E3-1505M v5. When I was configuring this laptop, it says that ECC memory is required and choosing a non-ECC memory makes a message pop up saying the selected memory is incompatible with the processor.

For saving money, I ordered this laptop with 8GB of ECC memory (4GB X2) as configured from Dell. Then, I ordered this RAM kit from Crucial to upgrade the laptop:

Installing both Crucial memory sticks (replacing the 2 OEM 4gb sticks) results in the computer booting up with amber blinking pattern 2,5 indicating invalid memory installed. See page 62 of the owner's manual:'s%20Manual_en-us.pdf

However, booting with just one stick of 16GB memory does not result in any problems and the system is able to post and load into the OS, which recognizes 16GB installed.

I am aware that the Crucial memory I purchased is 2400Mhz and the configurations from Dell for this laptop only list 2133 Mhz RAM. This does not seem to be an issue though considering the laptop is able to boot up with 16GB of 2400Mhz ECC just fine. Furthermore, this system is capable of handling 32GB according to the owner's manual and memory configuration options from Dell's ordering site:

Please advise on how to allow this machine to boot with two sticks of 16GB 2400Mhz ECC. If this is not possible, would this memory kit be compatible with this machine with the selected processor mentioned above? It is 2133Mhz, but non-ECC.

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