According to 

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<ul>
<li><tt> VLT-SPE-SPH-14690-0083 (SPHERE Technical Specification)</tt>
<li><tt> VLT-MAN-SPH-14690-0430 P104.0 </tt> 
</ul>

The IRDIS detector read out noise is specified to be lower than 15e-. Given 
the gain (see user manual) of 
1.75 e-/ADU, this results 
in 8.75 ADU.
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Please note the temperature dependence documented in the FULL plots.
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Evaluation:
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For IRDIS DIT=2 and DIT=30, ron is below the specification. 
As the KPI plot reference value we choose the long-term average 
for data processed with the sphere pipeline recipe (after 2017):
4.62 ADU (DIT=2) and 3.06 ADU (DIT=30)