Mobile GTX 1650 4GG notes:
-Confirmed p0 power state of card at all times via: nvidia-smi -q -d PERFORMANCE
-Confirmed "max speeds" (see below) via: nvidia-smi -q -d CLOCK
-Confirmed list of speeds possible (60001Mhz for memory, 1785Mhz for graphics) via: "nvidia-smi --query-supported-clocks=timestamp,gpu_name,gpu_uuid,memory,graphics --format=csv"

In all tests run below, regardless of speed, settings for GPU were:
    Max Clocks
        Graphics                          : 1785 MHz
        SM                                : 1785 MHz
        Memory                            : 6001 MHz
        Video                             : 1650 MHz
    Max Customer Boost Clocks
        Graphics                          : 1785 MHz

First render numbers tossed because they're always slightly longer.
Prompt "A man in a spacesuit riding a horse", sampler: DPM++ 2S a Karras, 20 steps

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 75 --xformers
512 1:41, 5.06s/it
832 6:33, 19.69s/it

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 20 --xformers
512 1:39, 4.95s/it
832 6:23, 19.19s/it

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 10 --xformers
512 1:40, 5.00s/it
832 6:26, 19.32s/it

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 5 --xformers
512 1:38, 4.93s/it
704 4:09, 12.48s/it
832 6:24, 19.21s/it

--xformers
512 1:40, 5.04s/it
832 6:32, 19.63s/it

--xformers --no-half
OOM ERROR ON LOAD, BREAKS TO SHELL

--xformers --no-half --medvram
512 :49, 2.46s/it
832 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 50 --xformers --no-half --medvram
512 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 40 --xformers --no-half --medvram
512 :46, 2.33s/it
576 1:04, 3.21s/it
640 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 30 --xformers --no-half --medvram
512 :46, 2.35s/it
640 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 25 --xformers --no-half --medvram
512 :47, 2.36s/it
640 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 20 --xformers --no-half --medvram
512 :46, 2.33s/it
640 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 15 --xformers --no-half --medvram
512 :46, 2.35s/it
576 1:04, 3.23s/it
640 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 8 --xformers --no-half --medvram
512 :46, 2.31s/it
640 OOM

--opt-sub-quad-attention --sub-quad-min-chunk-vram-percent 5 --xformers --no-half --medvram
512 :47, 2.37s/it
576 1:04, 3.23s/it
640 OOM

(slow.bat) --no-half --no-half-vae --lowvram --opt-split-attention --xformers --listen
512 3:25, 10.28s/it
832 5:09, 15.47s/it