PC/RAM upgrade

Hello, I tell myself that sometimes, I will find an answer here ... :) My workstation is a first generation HP Z1 workstation. We switched to Sw 2019 and at the same time I asked to give this pc a facelift by adding RAM ... I only had 8 GB (2x4)...

So I installed my 2 new sticks (2x8 GB) in the same slots as the old ones and I thought I could keep my 2 old ones in addition for a total of 24 GB ... But in vain, I can't manage to accumulate my bars. In theory I can put up to 32 GB on this pc, if I'm not mistaken. but when I put the 4 strips on the other 2 slots, I have 5 beeps at startup... I tested the 2 sets of strips, independently on the other 2 slots, it works too... I have 2 Black slots, on which were my old ones and on which my new ones were connected, I have 2 other beige slots, which take my strips by 2... but the pc doesn't like it when I put the 4... Note that my sets of sticks are not of the same brand between the new and the old ones. Is it a parameter to be set in the bios or is it because of the difference in memory... However I checked at home on my personal pc, I have 12 GB in 4 sticks that don't even have the same frequency, on the other hand they are of the same brand ... If anyone has an idea ... Thank you in advance.

There is no problem mixing brands, frequencies and capacities, the system is just based on the slowest one.

On the other hand, the mix of black and beige slots doesn't work. So you can only use 2 slots.
Note that one of the families requires 2 identical strips while the other allows mixtures.

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In other words, I can't put my 2 old sticks in addition? my other two slots just used to mix mixed strips?... that's stupid ... On my personal PC, I have my 4 slots full ...

Currently, to detail, I have 4 slots, let's say from left to right, slot 1 - 2 - 3 - 4, the 1 and 3 being beige and the 2 and 4 black, I have my new bars (of the same frequency and brand) on the 4 and 2, but if I add the old ones on the 1 and 3 (of the same frequency between them as well) it doesn't work...

 

That's exactly it.

 

Well benh thank you for your answer! ;)