What is the difference between this GPU and the Powercolor Radeon RX 590 Red Dragon? I read that the GPU from Powercolor has "Double Precision Floating Point (DPFP)". What exactly is that all about? Will I need it for gaming and normal desktop work?

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The GPU is the same, but as far as I can tell the different cards need different amounts of power (between 8 and 16 pin power connectors), so you need a power supply that has these connectors.

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Question about MSI Radeon RX 590 ARMOR 8G OC

What is the difference between this GPU and the Powercolor Radeon RX 590 Red Dragon? I read that the GPU from Powercolor has "Double Precision Floating Point (DPFP)". What exactly is that all about? Will I need it for gaming and normal desktop work?