Yes, the Delkin Devices PRIME SD V60 128GB is compatible with the Sony FX3.
Sony FX3's SD slot accepts Delkin Devices PRIME SD V60 128GB directly. V60 class meets the V60 floor for standard XAVC HS/S 4K (280Mbps) but never reaches the V90 floor the camera's top-tier XAVC S-I intraframe modes (600Mbps/222Mbps) require — no setting or firmware update changes a card's rated speed class.
Limitation
Cannot record XAVC S-I 4K (600Mbps) or XAVC S-I HD (222Mbps) intraframe modes on the SD slot — those require SDXC V90 or higher. Works for XAVC HS 4K / XAVC S 4K (280Mbps) and XAVC S HD (100Mbps) on this slot.
“XAVC HS 4K 280Mbps CFexpress Type A memory card (VPG200 or higher) SDXC V60 or higher”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)