An off the cuff thought...
After doing a bit of reading on issues with 118 chips that date back a bit, and spending all day flood testing four different boxes/sticks, the main issue I can see with all the different models is the power supply is so poor, everyone knows this, so what do the box builders do, do they put more money into the power supply, or do rockchip lock down the rk118 and lowering the voltage to help get around the cheap and nasty power supplies, just out of interest I got some Linksys 5v 2a power supplies the other day, they fit the x7 mini and the K-R42 very well, these units were very unstable last week the better one was the K-R42 with stock power supply, maybe this one is -t, but now with new power supplies they are all much more stable, funny the most stable is the non rk118 and that's the neo G4, but I did stick that on a 2 amp power supply..
I just cant see the 118-T being a different chip, my guess is its just a tuned down lower voltage unit, it would cost too much to make another chip with same architecture, especially for the life span left!
as the guys said about the pentium, they were all the top chip just the ones that failed the tests were locked down in the multiplier and given a lower voltage, and many times there were ways of undoing the lock, so maybe the same here, but as with the old Pentiums and Athlons if they are failure at higher clocks they will just fail again when unlocked, well some anyway??
Just a stab in the dark?
After doing a bit of reading on issues with 118 chips that date back a bit, and spending all day flood testing four different boxes/sticks, the main issue I can see with all the different models is the power supply is so poor, everyone knows this, so what do the box builders do, do they put more money into the power supply, or do rockchip lock down the rk118 and lowering the voltage to help get around the cheap and nasty power supplies, just out of interest I got some Linksys 5v 2a power supplies the other day, they fit the x7 mini and the K-R42 very well, these units were very unstable last week the better one was the K-R42 with stock power supply, maybe this one is -t, but now with new power supplies they are all much more stable, funny the most stable is the non rk118 and that's the neo G4, but I did stick that on a 2 amp power supply..
I just cant see the 118-T being a different chip, my guess is its just a tuned down lower voltage unit, it would cost too much to make another chip with same architecture, especially for the life span left!
as the guys said about the pentium, they were all the top chip just the ones that failed the tests were locked down in the multiplier and given a lower voltage, and many times there were ways of undoing the lock, so maybe the same here, but as with the old Pentiums and Athlons if they are failure at higher clocks they will just fail again when unlocked, well some anyway??
Just a stab in the dark?
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(jk)
but it would show since mine has 2 antenna's, though the solderpads for those antennas seem also in the same place as on the other photos. 
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