A major problem of state-of-the-art Nb 3 Sn accelerator magnets is their long training due to thermo-mechanical perturbations. Increasing the specific heat, C p , of the Rutherford cable would reduce and/or eliminate training by limiting the coils temperature rise. This paper studies feasibility of increasing the C p of Rutherford-type cables by using thin composite Cu/Gd 2 O 3 and Cu/Gd 2 O 2 S tapes produced by Hyper Tech Research, Inc. The tape can be either wrapped around the cable, placed on the cable wide faces under the insulation, and/or inserted as a core. Wire samples outfitted with these high- C p ribbons, or tapes, were prepared and tested at FNAL for their Minimum Quench Energy ( MQE ). At 90% I c and 15 T, the average gain of MQE of the Nb 3 Sn wire soldered to the Cu/Gd 2 O 2 S 55 μm thick ribbon was 2.5, and further increased at larger transport currents.