No, 62° idle is not normal for the 7900x.
No, 62° idle is not normal for the 7900x.
Ryzen Master works well. It offers the simplest method for undervolting. It provides direct BIOS access, which is the key benefit.
All processors are resting except one that’s consuming 30W, which explains the reported temperature of 60°C. This single core is responsible for the spike. The entire CPU isn’t at 60°C—it’s just this one core reaching that peak because it’s actively working. It won’t matter if you lower the voltage; most of the power usage comes from how much current the CPU draws. Let's break it down: it accounts for about 12% of TDC, or roughly 19.2A at 1.439V, which equals around 27W in that core alone. Even if you try to undervolt it to 1.3V, the single core would still draw about 25W. Because this core is tiny with minimal surface area, moving much heat from it into the cooler is tough due to physical limits. Improving the cooler setup or pressure might help slightly, but there’s little you can realistically do. It’s not a big concern and isn’t something you should worry about.
Ryzen temperatures tend to spike during heavy use but remain uncommon to stay at 60°C while idle. Over the past five years, I've noticed that when working on desktops, a single core or two quickly reach 60°C, then settle back down to 40–50°C. This behavior is more noticeable with Zen4 compared to Zen3 and Zen2, and it changes as the CPU model improves.