With the overclocked Polaris 20 core hitting 1505MHz in my testing, the SAPPHIRE Radeon RX 580 Nitro+ sitting on the Core i7-7700K system was using an average of 270W, while peaking at 290W. Considering the NVIDIA GeForce GTX 1080 Founders Edition on the same system consumes 230W, this is a big difference between the power efficiencies of the Polaris GPU architecture from AMD, and NVIDIA's efficient Pascal GPU architecture.
Still, the SAPPHIRE RX 580 Nitro+ was operating at a maximum of 57C under my 1500MHz+ overclock thanks to the increased fan speed of around 2100RPM. The 3DMark Time Spy results increased by roughly 100 points for graphics/full system, not a bad result for free, considering it's already clocked up from the RX 480 frequencies.
This is one area I really don't like, is that SAPPHIRE requires a 6+8-pin PCIe power setup, and uses more power than NVIDIA's much faster GeForce GTX 1080 Founders Edition.
In our full power testing, we can see that the Polaris GPU architecture is nowhere near as power efficient as NVIDIA's Pascal GPU architecture. AMD's original Radeon RX 480 reference card used 245W total in our system, while the custom SAPPHIRE RX 480 Nitro+ uses 254W, the new SAPPHIRE RX 580 Nitro+ boosts all the way up to 281W.
281W for the SAPPHIRE RX 580 Nitro+ while the brand new MSI GeForce GTX 1060 Gaming X+ 6G @ 9Gbps is ridiculously power efficient, sipping 194W total - nearly 100W less than the new RX 580. SAPPHIRE's overclocked RX 580 Nitro+ still loses to the custom MSI GTX 1060 6G 9Gbps, which is a super-new card, we haven't even finished our review on it yet as the RX 580 rush arrived too quickly after the GTX 1080 Ti rush, and now all three are going at once.
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