Is the 4 pin connector required? (HP Pro 3330 MT)

[rbits]

I have a HP Pro 3330 MT, and I want to upgrade the PSU. The ones I am looking at don't have a 4 pin connector. Do I need the 4 pin connector as well as the 24 pin connector, or just the 24 pin connector? The 4 pin connector says ATX_CPU, and the 24 pin one says ATX_POWER

[AndreiArgeanu]

You need both. The 4 pin is for cpu power. Most if not all PSU's will come with a 8pin cpu that can be split into 2x 4pins like this.