Hi ,
I would suggest you to have a look at the document given below at page number 4 :
http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA4-7343ENW.pdf
i have listed compatible power supply for respective units below :
HP Z230 Tower:
400-watt 92% efficient power supply,
320 W, Standard Efficiency Power Supply available in some countries.
HP Z230 Small Form Factor :
240-watt, 92% Efficiency power supply
240-watt Standard Efficiency Power Supply available in some countries
I hope it helps ,
I am an HP Employee
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