Yes, the Canon EOS R3 is compatible with the ProGrade Digital CFexpress Type B Gold 128GB.
The Canon EOS R3 accepts CFexpress Type B in Slot 1. The ProGrade Digital Gold (128GB) writes at 260 MB/s (min sustained ~250) -- enough for the R3's 6K RAW Light and All-I 4K/60 modes (200 MB/s floor per Canon's spec), but NOT enough for full 6K RAW or 4K/120 HFR, which Canon's own support page states require a card rated over 400 MB/s. The earlier '1400 MB/s, VPG400 rated' claim was the 256GB SKU's number, not this 128GB card's -- corrected 2026-06-21.
“CFexpress memory card Type B VPG400 support SD memory card Compatible with UHS-II”
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Confidence: inferred