The "Ver 12" is critical. Earlier versions (Ver 1.0, Ver 2.1) had different front-panel pinouts and power configurations. Version 12 introduced support for 4th and 5th Gen Intel Core processors (LGA 1150), DDR3 memory enhancements, and revised USB 3.0 headers.
Before we dig into the manual, let's decode the hardware. hp ms7860 ver 12 motherboard manual new
If you are looking for the manual to resolve an issue, consult these common points: The "Ver 12" is critical
Intel 4th Gen Core i3, i5, i7, Pentium, and Celeron (Haswell architecture) DDR3 memory enhancements