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Does the matching memory speed matter during upgrade?

I just got myself a brand new Dell Laptop. The ram on the spec sheet was 8gb DDR4 2666Mhz and when i contacted dell, they told me that for 8th gen cpus, the ram will run at 2400MHz rather than 2666mhz. So is it possible to put a 8gb DDR4 stick from crucial running at 2400MHz or do i have to buy the same speed stick?? It is really important to me to have 16gb ram as i am doing my IT Engineering studies. 

Specs:

Dell Inspiron 15 5580

8th gen Intel Core i5 8565U

8GB DDR4 Ram 2666MHZ

1tb HDD

500GB Crucial mx500 SSD

MX150 2GB GDDR5 Graphics

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8 minutes ago, Roschlynn Dsouza said:

So is it possible to put a 8gb DDR4 stick from crucial running at 2400MHz or do i have to buy the same speed stick??

It's possible but then your memory as a whole will run at 2400mhz which will cost you a bit of performance despite having more headroom memory wise.

Personal Desktop":

CPU: Intel Core i7 10700K @5ghz |~| Cooling: bq! Dark Rock Pro 4 |~| MOBO: Gigabyte Z490UD ATX|~| RAM: 16gb DDR4 3333mhzCL16 G.Skill Trident Z |~| GPU: RX 6900XT Sapphire Nitro+ |~| PSU: Corsair TX650M 80Plus Gold |~| Boot:  SSD WD Green M.2 2280 240GB |~| Storage: 1x3TB HDD 7200rpm Seagate Barracuda + SanDisk Ultra 3D 1TB |~| Case: Fractal Design Meshify C Mini |~| Display: Toshiba UL7A 4K/60hz |~| OS: Windows 10 Pro.

Luna, the temporary Desktop:

CPU: AMD R9 7950XT  |~| Cooling: bq! Dark Rock 4 Pro |~| MOBO: Gigabyte Aorus Master |~| RAM: 32G Kingston HyperX |~| GPU: AMD Radeon RX 7900XTX (Reference) |~| PSU: Corsair HX1000 80+ Platinum |~| Windows Boot Drive: 2x 512GB (1TB total) Plextor SATA SSD (RAID0 volume) |~| Linux Boot Drive: 500GB Kingston A2000 |~| Storage: 4TB WD Black HDD |~| Case: Cooler Master Silencio S600 |~| Display 1 (leftmost): Eizo (unknown model) 1920x1080 IPS @ 60Hz|~| Display 2 (center): BenQ ZOWIE XL2540 1920x1080 TN @ 240Hz |~| Display 3 (rightmost): Wacom Cintiq Pro 24 3840x2160 IPS @ 60Hz 10-bit |~| OS: Windows 10 Pro (games / art) + Linux (distro: NixOS; programming and daily driver)
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Just now, Princess Luna said:

It's possible but then your memory as a whole will run at 2400mhz which will cost you a bit of performance despite having more headroom memory wise.

Dell has told me that the ram will run at 2400mhz rather than 2666mhz. I dont know why but they have told me like this. They also told me that for the 8th gen cpu, the ram runs at 2400mhz rather than 2666mhz. So,i technically should be able to dump a 2400mhz ram from crucial right if the ram has to even run at 2400mhz rather than 2666mhz?

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