Typically, when a graphics card launches with two memory configs, they’re fundamentally the same, just with different memory densities. That’s the case with the GTX 580 3GB, the RX 580 8GB, and the rare GTX 960 4GB. That’s not the case with the two models of the RTX 3080, and it looks like the RTX 4080 could launch in a similar state.

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Source: Hot Hardware – NVIDIA Could Launch GeForce RTX 4080 With Two Distinct Memory Configs