[NAME] Your 2x8GB memory modules are most likely in slots DIMM1 and DIMM2, the slots with the white-colored securing clips. I would install the 1x16Gb module in DIMM3, the slot closest to the CPU. Dell should have recommended purchasing another 2x8GB because the memory configuration matrix in the Service Manual (Table 2, page 53) does not show the 1x16GB configuration. The additional 1x16GB should work but your system memory will operate in single-channel mode vs. dual-channel mode because the 1x16GB is not paired with another memory module. Single-channel mode is slightly slower, but you will probably not notice the difference. Note that the memory configuration matrix does show single memory module configurations, but does not mix single and paired modules.
Hi, I’m new to installing additional RAM. I currently have 16GB (2x8GB) DDR4 2666MHz UDIMM in two slots. I’ve purchased an additional 16GB from Dell , it’s 1 stick of 16GB. I purchased this with the assistance of a Dell rep making sure it would be compatible. I’m wondering what slot this should go into and is this type of configuration okay or should it have been something else? Thanks.
XPS 8930, adding Ram, but to which slots?