Several manufacturers sell cards built on the same chip — ASUS, Palit, Sapphire, ASRock — and the difference lies in the cooling and the dimensions of the card; within ASUS's own range the Dual, Prime and TUF Gaming lines run side by side. Memory capacity starts to make a difference at higher resolutions: 8 GB cards are meant for Full HD, 16 GB models for games with heavier textures. Measure the length of the card against the case, and check the power supply's output against the card.
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Several manufacturers sell cards built on the same chip — ASUS, Palit, Sapphire, ASRock — and the difference lies in the cooling and the dimensions of the card; within ASUS's own range the Dual, Prime and TUF Gaming lines run side by side. Memory capacity starts to make a difference at higher resolutions: 8 GB cards are meant for Full HD, 16 GB models for games with heavier textures. Measure the length of the card against the case, and check the power supply's output against the card.