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The article states the High-Efficiency Mode toggle is available on MSI AMD AM5 motherboards in Click BIOS X under the overclocking section for those with the latest BIOS version. The article does not list specific motherboard models that support the feature. Answered

The four High-Efficiency Mode presets, Relax, Balance, Tighter, and Tightest, apply progressively more aggressive secondary and tertiary memory subtiming values, with Relax being the most conservative and Tightest the most aggressive. MSI recommends starting with a conservative preset and stress testing because tighter subtimings can cause instability depending on controller, ICs, and board revision. Answered

MSI found High-Efficiency Mode tightened secondary and tertiary subtimings on a standard DDR5-6000 CL30 kit, cutting AIDA64 latency from 79.4ns with the feature off to 71.6ns with the Tightest preset, essentially matching a G.Skill EXPO ULL kit at 71.4ns. With EXPO ULL kits the feature produced only a tiny improvement (71.4ns to 71.1ns) because the ULL profile already applies similar tight subtimings. Answered

MSI recommends starting with a conservative preset and then stress testing after enabling a tighter High-Efficiency Mode preset. Specifically, they suggest using tools like MemTest86 or OCCT to check stability before pushing further, since tighter timings can cause instability depending on the memory controller, memory ICs, and board revision. Answered