How muсh cost WRITE in RVT?

its again story about rvt work.
my question about profiling this work or about cost range(min-max)
difference in ms its not good becouse i have very old hardware and get not correct result…i need only analitic answer or explaining how profiling per-mesh write performance

etc: read from rvt cost near 200 instruction but its only read texture so i think write in rvt can cost much MORE than drawcall
SO i need more exact info