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i don't have an hp to know different, but i wouldn't think the hp bios would prevent newer video cards from working. you may want to search for solutions, like this from hp's forums:
if you want a new machine, something built around the i7-6700k would be a good system for lightroom. if you need a quadro for 10bit display, the quadro m2000 is a good card. if you don't need a quadro the nvidia gtx 960 4gb or amd rx 470 4gb may be enough. asus makes good parts, noctua and cryorig make good air coolers, fractal design, phanteks and corsair make good cases, corsair rmx or rmi and evga g2 are good power supplies. if you did want to buy one pre-built, there are lots of custom pc shops websites, and even hp z240 tower models can be custom ordered with the 6700k and quadro. hp non workstation towers are slightly cheaper with gtx options. if you do buy one pre-built you can add in your ssd and hdd, and install or clone windows to the ssd.
Thanks for your reply.
I had a had time believing it myself. It has to do with UEFI. This URL explains it. Trouble updating BIOS to run new Video Card - Page 2 - HP Support Forum - 3894924
I didn't realize HP had that model. I will look at it seriously.
Windows 10 (or something else) has alleviated the slowness I was experiencing with Lightroom. Perhaps the GPU being unavailable was not causing my problem.