I am confused. The card you've provided a link to lists a length of 14.5 inches. According to BareFeats, the longest card that will fit into the 7.1 Mac is 12.2 inches. Did you link the wrong card, or did you actually fit a 14.5 inch card in your 7.1 Mac? Incidentally, I purchased an RX 6900 XT video card from Amazon a while ago that lists a length of 11.26 inches, and it did appear that that 12.2 inch maximum size was accurate.
He's using a Reference RX-7900 XTX made by Sapphire.
You really should learn the difference between the reference cards and the overclocked ones. The OC cards generally have better specs but they are larger (with Gigabyte usually being the exception though not always), as they have different cooler designs to accommodate for being OC'd, etc....
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