Dell latitude 5440 i7-1355u upgrade

dell latitude e5440 m 2 slot   Dan dell sc slot

2 drive from the list which will force booting from the drive If it boots faster then you can figure that the boot order or boot

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brl slot Intel Core i5 6th Generation 8GB 256GB SSD M2 14″ LED Display Windows 10 Imported Slightly Used Stock  Image 2 of Restored Dell Latitude E5440 14 Laptop Intel i3-4010U Dual Core Restored Dell Latitude E5470 Core i5-6440HQ 16GB RAM 256GB Add