Re: way to use all 8GB VRAM which is half disabled on P104-100 card
P102 uses 10 memory banks *512MB, so no solution for 102 
rly? https://www.micron.com/products/graphics-memory/gddr5x/part-catalog?Value=8Gb&Id={826DD0CE-31A2-43CD-AA36-E65D0DB21D31}
only one type banks exists - 8gbits -1gbyte
m8 do u have the pcb layout image of P102? we should confirm it has spare vram on it first.