What is the maximum overclocking of the nvidia gt 740m graphics card

Why overclock laptop video cards at all...? They are already hot...
As far as I remember, the GT 740 has a core overclocking lock. You can only drive memory through nVidia Inspector. There are tests on the Internet with this card, but a lot depends on a particular laptop! Somewhere it is chasing 300 MHz, but somewhere it cannot break even 50 MHz.

Sakho2015
Overclocking such a card will give almost nothing, you can try nVidia Inspector or MSI Afterburner. Core overclocking is limited to +135 MHz on NVIDIA mobile cards, the memory limit is higher.