The pictures I posted show the difference between the older NEC (which sold this end of their business to Renasus) and the newer much better Texas Instruments card. Turns out HP liked the TI chipset so much that they then integraged it into their Z420/Z620/Z820 motherboards.
Thus, the easiest way to find the correct drivers for your TI based card is to go to the Z620 drivers download site and find them there. Those work fine on both the card and the motherboard chipset. This card works fine on our xw6400, xw6600, xw8600, xw4600, Z400, Z600 and Z800 workstations.... same drivers. As explained, power up the card properly before loading the drivers or the installer will not see all the parts and not load things correctly.