What RAM did you buy? When you opened the laptop, handled the RAM or touched any components, did you wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard and don't wear static-generating clothing such as polyester. If you didn't take such precautions, it's possible that you damaged something. If I suspect a memory issue or if I bought new RAM and wanted to verify its quality, I would use a more thorough testing utility such as memtest86+. memtest86+ runs from a bootable flash drive or CD/DVD, so it can test more of the memory than is possible with Windows Memory Diagnostic. memtest86+ should be allowed to run for at least three passes, which on older hardware can take many hours. Over at TenForums they say that for solid test results you should let it run at least 8 passes in a single session.[URL] I suggest that you run memtest86+ for at least 8 passes. I don't know your laptop specs, but depending on your hardware that testing could take a day or two. You must run all passes in a single session. Running, for example, two passes now, three passes tonight and more passes tomorrow does not give the same confidence as all passes in a single session. If you receive even a single error, you can stop the testing. Any error reported by memtest86+ means that there is a hardware problem, though not necessarily in the RAM. Errors could relate to issues with CPU, motherboard, RAM slots, etc. There is a process to follow to test RAM sticks individually in each slot, etc., to gradually narrow down the source of the errors.  
My laptop is an Inspiron 5570 and it has two slots of DDR4 RAM (2400Hz), each one with a maximum of 16Gb as the docs of the product says. I have 16Gb (slot 1) and decided to upgrade to 32Gb using two RAM modules with same specification from the docs. After the upgrade of the new 16Gb RAM in slot 2 (DIMM B), I've run the preboot diagnostic test on the memory and passed all tests. Even the "WCMch" test passed, I got some unexpected values such as below. What these values mean? Is this a bad RAM module and should I replace it?Regards. [IMAGE]  
Got unexpected value on memory test after memory upgrade in Inspiron 5570