Samsung has not yet updated their Magician software to detect Windows 10, meaning RAPID mode (needed to fix the write performance) does not function:
Some have managed to install 4.4 (which does not check OS version), enable RAPID, then make the setting stick with their upgrade to 4.7. However 4.4 does not detect some drives like the 500GB Evo 850 (at least not mine), so that workaround is useless for those.
Their Facebook page is full of posts asking when they'll fix this, but so far no answer. So for now, the Evo 850 is not fully compatible with Windows 10.
Some have managed to install 4.4 (which does not check OS version), enable RAPID, then make the setting stick with their upgrade to 4.7. However 4.4 does not detect some drives like the 500GB Evo 850 (at least not mine), so that workaround is useless for those.
Their Facebook page is full of posts asking when they'll fix this, but so far no answer. So for now, the Evo 850 is not fully compatible with Windows 10.