Something strange happened.
Running F2 ram at 201 timings 2.5 4 4 8 Voltage +0.1 worked fine, ET4 gives no temps.
Update to F8, ram at 158.1 timings 2.0 3 3 7 Voltage +0.1 ET4 fully functional.
Update to F9, ram at 157.9 timings 2.0 3 3 7 Voltage +0.1 ET4 fully functional.
I go back...