Unfortunately, we wouldn't be able to tell you that.
HP uses memory from various vendors, so there is no telling what vendors memory they installed in your particular PC.
I have zipped up and attached a free utility you can run.
After you run it, close out of the summary window and on the left side of the screen, click on the Memory section, then click on each memory module listed, and it should tell you the manufacturer of the memory module(s).
I have attached a screen shot of the memory info it shows for my HP desktop PC.
I removed the HP memory, and maxed mine out.
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