Yes, the Canon EOS R8 is compatible with the Transcend 700S V90 128GB.
Transcend 700S V90 writes at 250 MB/s. Canon R8 4K30 floor is 30 MB/s (UHS Speed Class 3). Well within range.
“Canon EOS R8 Compatible Cards: SD/SDHC/SDXC with UHS-II and UHS-I supported; for movies use a card with ample performance (fast enough writing and reading speeds) per Canon online manual.”
Last verified:
Confidence: inferred