  Prompted by the recent report on the evidence for superconductivity at
ambient temperature and pressure in nanostructures of silver particles embedded
into a gold matrix [arXiv:1807.08572], we have exploited first principles
materials discovery approaches to predict superconductivity in the 3D bulk
crystals and 2D slabs of Ag-Au binary alloys at 1 atm pressure within the
phonon-mediated BCS-like pairing mechanism. In calculations, it turns out that,
the estimated superconducting transition temperatures of the ensued stable and
metastable Ag-Au alloys resulted in Tc as low as one mK. Whereas similar
calculations for the known superconducting intermetallic compounds consisting
of gold, Laves Au2Bi and A15 Nb3Au predict Tc =3.6 K and 10.1 K, respectively,
corroborate with experiments. And, the hitherto unknown silver analogues, Ag2Bi
and Nb3Ag are also found to be superconducting at 6.1 K and 10.8 K,
respectively. Furthermore, we show that, elemental Au in its metastable 9R, and
hcp phases superconduct at Tc =1 mK; but not Ag, in these hexagonal lattices.
