30 more watts should not matter to anyone, i am sure we all have PSU's that can support a 580. Does the 580 support Freesync 2? that might be a reason to get one over a discounts 480 but the lack of info suggests these will not support freesync 2 with HDR. However i thought i saw a box on a website earlier today saying it would get support for HDR. i wonder if Vega will get freesync 2 then the next mainstream iteration of cards will get it.
It's not clear from the press release whether or not Freesync 2 monitors require the 5xx cards instead of just 4xx, but if you plan to buy a F2 monitor with HDR then yes the 580 supports it:
http://www.amd.com/en-us/press-releases/Pages/radeon-rx-500-series-2017apr18.aspx#
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Smooth, stutter-free gaming with Radeon™ FreeSync – Gamers can enjoy smooth framerates in virtually every game released, without the frustration of screen tearing and input lag using Radeon FreeSync, available on a wide range of affordable displays.5 For those that want to get even closer to pixel-perfect gaming, Radeon™ FreeSync 2 monitors harness low-latency, high-brightness pixels, excellent black levels and a wide color gamut to display high dynamic range (HDR) content, and feature Low Framerate Compensation (LFC) enabling stutter-free gaming when framerates dip below a monitor's refresh rate, all in a completely plug-and-play experience that eliminates the need to tweak settings in software or on the monitor.6
6. Radeon™ FreeSync 2 does not require HDR capable monitors; driver can set monitor in native mode when FreeSync 2 supported HDR content is detected. Otherwise, HDR content requires that the system be configured with a fully HDR-ready content chain, including: graphics card, graphics driver and application. Video content must be graded in HDR and viewed with an HDR-ready player. Windowed mode content requires operating system support. GD-105
30 more watts should not matter to anyone, i am sure we all have PSU's that can support a 580.
I care about noise, and in general more power = more heat = more noise. If you use headphones or a noisy CPU HSF then it probably doesn't matter.
If you use the PC for much video playback then the new middle power state is a good reason to buy the 5xx, since that cuts power (and noise) way down when watching a movie.