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Eevee - Principled BSDF doesn't use specular value in metallic mode.
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 416.34

Blender Version
Broken: version: 2.80 (sub 72), branch: master, commit date: 2019-05-25 13:41, hash: rBe1d1899e7290
Worked: (optional)

Short description of error
In Cycles, the strength of the "metallic rim" is controlled by the specular value:

In Eevee however, the metallic rim is fixed and is not influenced by the specular value:

This is an inconsistency between Cycles and Eevee, that was probably just an oversight. I'd classify it as a bug - sorry if it's not, then I'll create a Rightclickselect request instead.

Exact steps for others to reproduce the error

  • Add a material and set metallic to 1.0 and specular to 0.0

Example File