If you purchased 32 GB RAM module/s it will not work. So again that is 2 slots with 16GB in each slot for a total of 32GB. The support page for the 7590 is misleading as it states 32GB per slot and that is incorrect. The following from the support page is correct however.
JOcean
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Posted September 17th, 2019 06:00
The maximum memory supported for the 7590 is 32GB. That is 2x16 GB RAM modules =
CRXJ6 16GB, SODIMM, 2666MHz, 1Gx72, Unbuffered, DDR4, 260 Pin, Dual Rank, 1.2V, Non-Error Correction Code, Non-Encrypted
If you purchased 32 GB RAM module/s it will not work. So again that is 2 slots with 16GB in each slot for a total of 32GB. The support page for the 7590 is misleading as it states 32GB per slot and that is incorrect. The following from the support page is correct however.
Configurations supported
•4 GB DDR4 at 2667 MHz (1 x 4 GB)
•8 GB DDR4 at 2667 MHz (2 x 4 GB
•16 GB DDR4 at 2667 MHz (2 x 8 GB)
•32 GB DDR4 at 2667 MHz (2 x 16 GB)
For example.
https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/xps-15-%287590%29
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop