With a thickness of only 21.49 mm, the EliteBook 840 is both stylish and powerful. All materials were carefully selected to make the unit even more lightweight and slim. The mass of the magnesium unibody casing has been reduced by 34 per cent and its thickness by 40 per cent as compared to previous models in the series. The notebook is still durable enough to meet the demands of challenging work environments and conditions. In addition, several high-performance components are concealed in the chassis, thus enabling high productivity.