If I use the Dell supplied driver QuickSync offloads all the encoding to the GPU (when I select that encoder) but with the Intel provided driver (which is a newer version) the QuickSync functionality doesn't work properly - it pushes the encoding to the CPU and it takes a little longer. For example, in my situation with the Dell Latitude E6420 laptop I have it uses the standard Intel 3000 GPU as part of the CPU (Sandy Bridge Core i7) - the Dell supplied driver adds some functionality that the plain old vanilla Intel-distributed 3000 GPU driver doesn't (like QuickSync working properly which allows me to use the GPU to do accelerated video encoding).
The only exception might be for laptops which sometimes to actually have drivers tailored for that specific hardware. But if you must have to get some additional functionality not provided with the distribution or Windows Update drivers then as long as the driver version is newer I'd say it can't hurt to install whatever the actual manufacturer of the given hardware provides. So it's a safe bet to say the distribution and Windows Update versions will keep your machine running reliably and stable for sure.
They're sent to Microsoft for testing in their labs to ensure compatibility and stability first and foremost and if they pass all Microsoft's testing then they get added to the distribution and after that is released then updated versions go to Windows Update - the other thing is that those drivers tend to leave out some additional functionality depending on the device itself (graphics drivers won't come with the Control Panel applets or driver configuration tools like the Catalyst Control Center for ATI/AMD hardware or the Nvidia Control Panel for Nvidia hardware, sound cards might not come with a Control Panel applet for configuration as well, etc). One would say that the drivers provided to Windows Update and those included in the Windows 10 distribution files (on the ISO or whatever) are "more stable" overall and designed to make sure the hardware functions as expected but they are most definitely not designed for performance.
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