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03-20-2020 02:46 PM - edited 03-20-2020 02:51 PM
HP released a Thunderbolt 2 card based on the reference Intel card for the zx20 line and a TBolt 3 card for the later zx40 systems the z840 uses a 5 pin gpio cable unlike the z820's custom gpio cable that connects to 2 usb headers
every TBolt card i have seen has a 10 pin header on it which connects to the motherboards header,
read the information below for general Thunderbolt information
while it "might" be possible to install a TBolt 3 card in systems like the Zx20 series that only came with TBolt 2 cards, keep in mind that you will not get TBolt 3 speeds in systems that have a pci-e 2.0 bus (TBolt 3 needs pci-e 3.0 for the full data speeds)
the HP z820 was unique as the engineers added thunderbolt late in the motherboards design cycle, as such they were unable to use a dedicated thunderbolt header on the motherboard, so what they did was repurpose two of the usb 2.0 headers on the board for the necessary TBolt signals you need this specific cable for the card to work in the z820 i don't know if the z420/620 used the same cable as the z820
while most wenders (like dell lenovo) settled on using a dedicated 5 pin header on the motherboard, there is no guarantee each board maker followed the same pinout, so a dell cable may or may not work on the lenovo board and vice versa
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