At least in regards to bounty materials, it's 1/2 torment level. So t8 drops 4, t10 drops 5. t9 and t7 however i think is 50/50 on dropping 4/5 or 3/4 respectively. Also that number is doubled if you do bonus act, so basically if you're only doing bonus act, you get the same number of materials (on average) as the torment level.
From my xp with ubers, t10 seems 50/50 on 2/3 organs but that's pure conjecture.
At least in regards to bounty materials, it's 1/2 torment level. So t8 drops 4, t10 drops 5. t9 and t7 however i think is 50/50 on dropping 4/5 or 3/4 respectively. Also that number is doubled if you do bonus act, so basically if you're only doing bonus act, you get the same number of materials (on average) as the torment level.
From my xp with ubers, t10 seems 50/50 on 2/3 organs but that's pure conjecture.