Yes, the Samsung PRO Plus 256GB SD is compatible with the Sony Alpha A7R V.
Samsung PRO Plus 256GB SD is V30 class. Clears: XAVC HS 4K (200 Mbps, requires U3); XAVC S 4K (200 Mbps, requires U3); XAVC S HD (100 Mbps, requires U3). Does not meet the floor for: XAVC HS 8K (400 Mbps, requires V60); XAVC S-I 4K (600 Mbps, requires V90); XAVC S-I HD (222 Mbps, requires V90).
Conditions for compatibility
Compatible for stills, XAVC HS 4K (200Mbps), XAVC S 4K (200Mbps), and XAVC S HD (100Mbps) — U3 minimum met. Cannot record XAVC HS 8K (requires V60 — UHS-I bus cannot achieve V60), XAVC S-I 4K (600Mbps, requires V90), or XAVC S-I HD (requires V90).
Limitation
UHS-I V30 card. 8K recording not possible — requires V60. Intra-frame (S-I) recording not possible — requires V90. Standard 4K and Full HD only.
“When the recording bit-rate is 200 Mbps, you can also record using an SDXC card (U3/V30).”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)