Yes, the Canon EOS R3 is compatible with the Delkin Devices POWER CFexpress Type B 128GB.
Canon EOS R3 Slot 1 accepts CFexpress Type B with VPG400 support. Delkin POWER Type B is VPG400 rated at 1700 MB/s write — meets all R3 recording modes including 6K RAW and 4K 120fps HFR.
“CFexpress memory card Type B VPG400 support SD memory card Compatible with UHS-II”
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Confidence: inferred