Memory for XPS 15 9550 is dual channel, I believe - slots should match in capacity and speed. If you look in the BIOS under System Information under DIMM A and DIMM B Size you can see what you've got without opening the case. Likely, you have 2 x 4GB sticks. For 16GB you'd need 2 x 8GB sticks. Official max RAM is 2 x 16GB.
you know some certified brand that has 16gbx2, I have tested 3 brands but they do not work together, only an old memory of 8GB and a new one of 16 GB, but both of 16 GB gives an error.
Techgee
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Posted January 12th, 2019 15:00
Memory for XPS 15 9550 is dual channel, I believe - slots should match in capacity and speed. If you look in the BIOS under System Information under DIMM A and DIMM B Size you can see what you've got without opening the case. Likely, you have 2 x 4GB sticks. For 16GB you'd need 2 x 8GB sticks. Official max RAM is 2 x 16GB.