FabianBorg,  The JC867 heatsink should work with all the processors compatible with the 1950 II, including the 5400 series. So there shouldn't be any issue with using it.   Hope this helps.
I will be upgrading the CPUs within the PE 1950 Gen II with the Intel Xeon E5450 processors and would like to ask if the PE1950 Gen II's heatsink Dell Part Number JC867 is compatible with the E5450. [IMAGE]  I am aware that this heatsink is compatible with the Xeon processor 5100 & 5300 series but I didn't find any documentation on the 5400 series.
JC867 heatsink compatible with Intel Xeon E5450?