You need exactly zero repeatables before robomodded free synths match slaves..
No-ascension, guaranteed available Mineral producing slaves have 20% from pop traits (Strong + Industrious) , 55% available from slavery, and 93% available from empire effects, plus 40% available in multiplicative bonuses. Giving them a 221% total available bonus.
Synths with 100% happiness have 35% from pop traits, 103% from empire effects, and 60% available multiplicative for a 220% bonus.
However, both bio and psi ascension can do more. Either adding an extra 25% global bonus for a total 256% or adding Very Strong, Nerve Stapled, and Robust to them for an extra 15% additive/5% multiplicative bonus for a 250% total bonus.
(For reference a bio hive mind can get 35% at pop level, 83% at empire level, and 60% multiplicative for a total 188% bonus and a Machine empire can get 35% at pop level, 113% empire level, and 30% multiplicative bonus for a total 192% bonus, leaving both hives way behind)
This is why I don't rate synth ascension. You can be as good as it at minerals, the only thing that really matter, before you do your ascension and beat it afterwards because ascension doesn't really change the synth empire's production of minerals because all those tiles would have been worked by synths anyway.
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