I'm using TFLOPs as my crude metric. We'll see how it plays out in terms of practical perfrmance, but right now it doesn't look like a huge leaps.
Early demos of ray-tracing are showing it to be an incredibly demanding feature that more or less means dropping down to 1080p and possibly dips well below 60fps, which may be an indicator that even with the major gains we might not quite be there yet, at least not for gaming.
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