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Regarding fitting this to a Z420 - my Asus 4gb OC just squeaked into the case which has 2 x 6 pin auxiliary power plugs fitted on the 600w psu. This card however has a 6 pin & 8 pin power plugs so a 6 pin to 2 x 8 pin  €11 adaptor from Amazon did the job. The first attempt didn't work but trying the other 8pin out with the side removed lit up the other helpful power light on the card white instead of red & all was fine. I'm not a big gamer but the extra ddr5 ram on the card is a great boost for photography & video work I use it for. Regarding the comment about UEFI in my installation on a win10 MBR based system also seems to work fine.

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