Yes, the Canon EOS R5 Mark II is compatible with the ProGrade Digital CFexpress Type B Gold 128GB.
ProGrade CFexpress Type B Gold (128GB) writes at 260 MB/s, exceeding Canon R5 Mark II's 90 MB/s (Video Speed Class V90) requirement for 4K120.
“Canon EOS R5 Mark II Compatible Cards: CFexpress Type-B compatible; cards for movie recording should support VPG400 per Canon online manual.”
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Confidence: inferred