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My laptop is Swift 3 SF315-52G, Intel Core i7-8550U, 1.80Ghz, SSD . It came with 8Gb DDR4 Ram, 2400 Mhz, CAS 17, from Hynix. For upgrading, I added a DDR4 SDRAM module, Kingston model KVR26S19D8/16: 16Gb, 2666 Mhz, CAS 19. It worked immediately, so I have 24 Gb now. When I saw that CPU-Z said "Dual" channel, I thought "great"! Moreover, CPU-Z shows the new module at 2666 in Dual “rank”.
BUT... Task manager just says 2400 Mhz about speed, without any further detail on single or dual channel. In fact, general speed is almost the same! Is it normal? May be 2666 but CAS 19 is like 2400 CAS 17? Indeed, my first interest was not speed but more Gbs, and perhaps speed was already good for my use. I don’t know even how do you check speed upgrade. However, I expected more from Dual channel… Anyway, which is the difference between Dual channel and Dual Ranks? Perhaps my laptop continues to use the single channel of my old Hynix module in the first place, but I don’t notice any difference when it takes over 8 Gb… Finally, perhaps did I not buy a genuine Kingston? (I noticed that its 8 rectangular components -2 Gb each one- are not in the same way as in publication pic).
Below, pics from CPU-Z. Slots 2 and 4 appear empty, but slot 3 with the new 16 Gb.
Thanks for any explanation!