Magic Lantern on Twitter: "71.5MB/s read!!! SDR104 @ 160MHz on 5D Mark III 1.1.3. Other cards might be even faster. Download available for 5D3, 6D and 700D. Porting to other DIGIC 5
SD 3.0 / 4.0 Overview | GraniteRiverLabs
Linux/AM5716: SDR104 card fails at 192MHz - Processors forum - Processors - TI E2E support forums
SD spec
TXS0206: Recommendation for SD level shift device supporting SDR104 - Logic forum - Logic - TI E2E support forums