kraade

brosnanyuen

zippytek

brosnanyuen 
Is boosting to 1920 MHz normal for the GPU?
Also, the GPU randomly crashes when boosting above 1900 MHz.
 

idk seems like you answered your question

Is 1725 MHz a good core clock for long term stability?
Is 9751 MHz a good memory clock for stability?
 
 
 

the stock clocks will always be stable , your stable boost depends on your temps
and power target. Run a stress test like Kombustor for 25 minutes and see where your boost settles , then you have your answer

 
On Linux, the default NVIDIA settings are not stable because the default NVIDIA settings allow the core clock go from 210 MHz to 2130 MHz.  Also it allows the memory clock to go from 400 MHz to 9751 MHz. There is no core clock limit by default, but there is a power limit by default (350W). Running stress tests will just increase the core clock above 1900 MHz and crash the system sometimes.
 

 
You have to manually set the core clock limit and memory clock limit, otherwise the clock will exceed the GPU's limit. But I don't know what is the clock limit for EVGA 3090 XC3 ULTRA.