It's the same for me. Best config for 4gb is double threads true and I 27, which gives 860. Higher intensity crashes miner in double threads, in single thread intensity is 57, but 740h/s.
Is it possible to get 1000+ on 4gb on haven and how?
8gb cards are giving 1150.
all 4gb card work with I=29 on heavy algo
rate 900+ with core=1250 mem=2000-2050