If Crucial recommends RAM for a specific PC model, they guarantee it will work or they take it back. So look here for compatible RAM for the Inspiron 3880.
Hi, I recently brought a dell Inspiron 3880 desktop 4gb ram, intel i3 3.6ghz 4 cores 4.3 overclock GHz 10 gen intel 1Tb HDD. I was thinking to upgrade my ram. When I looked at my desktop manual, I found that I needed a 2666mhz ram. I found good deals of ram 2666mhzz but in the manual, they did not explicitly say whether I needed a buffered or unbuffered ram or ECC or non-ECC ram so i just wanted to ask whether if Crucial - DDR4 - 16 GB - DIMM 288-pin - 2666 MHz / PC4-21300 - CL19 - 1.2 V - unbuffered - non-ECC(  [URL] ram would be good for my computer desktop? 
What ram should I have for inspiron 3880?