So I recently just upgraded my graphics card on my prebuilt HP Compaq Elite 8100 CMT PC , from GTS 250 , I chose from a variety of cards. GTX 750, 660, 1050 and so on. I have done my research and I know that newer cards including the 1000 series require UEFI BIOS in order for the PC to boot. However, when I took it to the shop where I will be purchasing the cards, i asked them to install and i'll get whatever card works. I was so surprised when the PC booted with the ASUS Geforce GTX 1050 2GB , to be specific. So my question is, is this really possible? I am certain that my motherboard only supports Legacy BIOS. Well it is working for me and I am currently using the card now, but I am just curious. Would appreciate any response thanks