These days we’ve been hearing a lot about AMD’s upcoming Big Navi graphics card based on the RDNA 2 architecture. From what we’ve heard, the Navi 21 XT will feature a boost clock of up to 2.4GHz with a TBP of just over 250W. However, as per Igor, this figure represents just the GPU power and excludes the power draw of the VRAM, VRM, and the rest of the PCB. If we add all the missing values, the total TDP of the graphics card comes up to:
Surprise, that’s roughly the same as that of the RTX 3080. Before you start complaining, yes this is despite the fact that AMD is using the 7nm node from TSMC which is quite a bit better than Samsung’s 8nm LPP node. However, you need to remember that AMD is aiming for much higher boost clocks (2.2-2.4GHz) while NVIDIA’s RTX 30 series mostly tops out at around 1.7GHz. That’s a delta of nearly 0.7GHz.
Third-party factory overclocked boards should have a slightly higher TBP of around 350W+, with the boost clocks possibly nearing 2.5GHz. In the end, though, I expect the Radeon RX 6900 XT to draw less power compared to the RTX 3080, but possibly at the cost of marginally lower 4K performance. Ampere’s GDDR6X memory and wider bandwidth and higher shader count should give it an edge at higher resolutions, but the competition should be much closer at 1440p. We’ll ignore 1080p as you’ll inevitably run into a CPU bottleneck/utilization issues at that resolution.
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