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We present results for solving electrically large electrodynamic problems using NVIDIA graphics processing units. The problems are solved using method of moments, surface integral-equation formulation, and higher-order basis functions. The large dense system of linear equations, which is filled by using method of moments, is solved with out-of-core approach accelerated with graphics processing units. Three electrically large examples are considered: a perfect electric conducing cube scatterer with up to 33 λ side length, a horn antenna with up to 125 λ length, and Cassegrain reflector antenna with up to 280 λ reflector diameter. The presented results show that problem of up to 200 000 unknown (complex) coefficients can be solved within 24 h on one personal computer with one graphics processing unit.