My recommendation is update your BIOS and set it to 'factory default' and then do a clean install using the Z440/Z640 HP Cloud Recovery W10 installer you can find via google. I've used both HP and Lenovo NVMe sticks. that has a nice aluminum heatsink and is of usual excellent HP quality. My recall is that DGroves states that you can use about any brand NVMe-controller M.2 stick in the HP ZTD G2 card. There is a recent post, plus an exhaustive link on ZTD Secrets in HERE . I've posted quite a bit of info on these cards, as has DGroves here. There is a new 2.61 BIOS out, by the way, from April 2023. Not sure on that but there is surely some talking back and forth between the card and BIOS. That feature might also signal to the BIOS that a ZTD G2 card is being used and to unlock that capability. The cards have some unique HP engineering built in to not let them work in workstations they were not designed for. There are HP NVMe-controller M.2 sticks you can put in that card, but DGroves and I both here have posted on use of other source NVMe-controller M2 sticks we've used in those ZTD G2 cards. that card is called a Z Turbo Drive G2 (generation 2). The Z440 (and the Z640 and Z840) were engineered by HP to also use a PCIe card inserted into specific PCIe slots. Business PCs, Workstations and Point of Sale Systems.Printer Wireless, Networking & Internet.DesignJet, Large Format Printers & Digital Press.

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