We overclocked by using the automated scanner tool.
Plenty of extra frequency headroom opportunity at lower voltages is normal for Ampere. All told, our sample boosted to 1,899MHz (2,070MHz in-game) with memory running along at 15.4Gbps.
Worth overclocking? Going by experiences in the last few years, the answer would have to be no. You'll be introducing potential instability for minimal gain.