@AntoineFlorian , welcome to the Community.
Q: Is there any way to get it to at least 2933mhz?
A: The short answer is no! HP doesn't use Extreme Memory Profiles (XMP) to overclock their memory. They use the standard JEDEC's. For this reason, it is not possible to get the overclocked speeds of third-party memory. The best way is to buy the correct amount when you buy the computer. The basic speed of memory modules is 2133 MHz.
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I am not an HP Employee!!
Intelligence is God given. Wisdom is the sum of our mistakes!!