The RX 7800 XT is notably absent from AMD's lineup. What can we expect?
graphics card, disabled half of its 32GB of memory and tweaked the power limits in order to simulate what to expect from a hypothetical RX 7800 XT.
Before looking at the results, it's important to remember that this is an experiment, and not one that claims to accurately simulate an RX 7800 XT. The actual specs of the Navi 32 GPU remain confidential, including the number of shaders, clock speeds and power levels. Also, the W7800 uses the big Navi 31 GPU which it shares with the RX 7900 cards, making this very much an unscientific comparison. An appropriate amount of salt is required. Nevertheless, it's interesting, and a fun little experiment from Igor.
Looking at the results, we see the 'RX 7800 XT' is barely faster than the RX 6800 XT. It might be more power efficient, but without a decent inter-generational jump in performance, there would be few reasons to choose an RX 7800 card over a 6800 XT or 6900 XT for playing games. We can expect the an RX 7800 to offer improvement in ray tracing performance, but that won't mean much if its raster performance isn't significantly better than the best RDNA 2 cards. Of course, AMD could sell the RX 7800 at an attractive price, though obviously it doesn't want to sacrifice its margins.
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