If you are looking for a small yet powerful notebook, Dell has the offer for you. The new Latitude 5480 features a Intel Core i7-7820HQ processors and high build quality.

The technology to connect an external desktop graphics card to a laptop is available from a rather short period of time. Companies like Razer, AKiTiO, and ASUS crated devices which allow you connect an external GPU to a laptop via a Thunderbolt 3. These devices are equipped with their own internal power supply and are compatible with almost every graphics card manufactured by AMD and NVIDIA.

You need a powerful CPU to make use of such a dock. The gorgeous-looking and slim ultrabooks with ULV processors are unfortunately not suitable for such needs. The problem with them is that they have low computing power which can severely bottleneck the high-performance graphics cards which isn’t the point.
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https://laptopmedia.com/news/the-new-14-inch-dell-latitude-5840-will-feature-a-intel-core-i7-7820hq-and-a-thunderbolt-3-port-to-attach-an-external-gpu/