The test by failure where 80% was discovered to be the overall cap including any type of delay reduction is here:
http://www.bluegartr.com/threads/100...=1#post4256398
There is also a breakdown by Motenten of meaningful haste values for nin/dnc/thf at different DW values in that thread but I cannot seem to find it.
edit: http://www.bluegartr.com/threads/100...=1#post4255574
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