wcrockett :
The 950 will be faster, if your motherboard can use it.
850 specs
http://www.samsung.com/global/business/semiconductor/minisite/SSD/global/html/ssd850pro/specifications.html\
950 specs
http://www.samsung.com/global/business/semiconductor/minisite/SSD/global/html/ssd950pro/specifications.html
In those 'specs', what specifically points to the 950 and 'boot faster'?
Yes, overall it is 'faster' than the 850. In some numbers, by quite a lot.
But what leads you to determine 'faster boot'?