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Performance difference in SSD

I recently bought 2 Samsung Evo 970 500GB M.2 NVME SSD's and installed one in my desktop, and one in my laptop.

When running Crystaldiskmark, The SSD installed in the desktop has sequential read/write speeds of about 3500/2500, but my on my laptop it shows 1800/1700.

All updates are installed and Samsung magician shows that both SSD's are connected through PCI-E gen.3 x 4. Laptop is powered and off energy saving mode.

 

What can cause this difference in performance? I thought maybe thermal issues in the laptop... The SSD gets up to 70°C in the laptop vs 50°C in the desktop.But I don't know what's normal with these SSD's

Desktop MB: Gigabyte Designare EX X399

Laptop: HP Pavilion 15-cs0960nd

 

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70C is too hot.

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8 minutes ago, Enderman said:

70C is too hot.

I'll try and sort some kind of heat dissipation thingy

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