OCCT 3.1.0 shows HD4870/4890 design flaw - they can't handle the new GPU test !

[W1zzard]

wether this might be OCP or OVP, which i didn't know about before today

those are very simple protections that have been added to recent voltage regulator designs. if an output stage mosfet blows (overheat) it is possible that it pulls the whole output stage to 12V = bad(tm). ovp protects against that

ocp is for cases where a short circuit occurs somewhere in the consumer circuit. short circuit = lots of current = bad(tm).

in a proper configuration ocp is set in a way that it is never triggered during "normal" use. apparently ati didnt do enough testing and set ocp too low.

in addition to those two, volterra has added overtemperature protection as well, which is triggered when an output stage gets too hot. there are some more fault triggers as well which are not important for us

[Tetedeiench]

those are very simple protections that have been added to recent voltage regulator designs. if an output stage mosfet blows (overheat) it is possible that it pulls the whole output stage to 12V = bad(tm). ovp protects against that

ocp is for cases where a short circuit occurs somewhere in the consumer circuit. short circuit = lots of current = bad(tm).

in a proper configuration ocp is set in a way that it is never triggered during "normal" use. apparently ati didnt do enough testing and set ocp too low.

in addition to those two, volterra has added overtemperature protection as well, which is triggered when an output stage gets too hot. there are some more fault triggers as well which are not important for us

Many thanks for your explanations Things are much clearer for me now We may have reached one of those limits, indeed.