Yes ARM will be more efficient than x86 at low loads, but Qualcomm hasn't shown the efficiency compared to the own predecessor X1. It would be nice if Qualcomm could achieve efficiencies at the level of Apple Silicon. But it's really nice, that Qualcomm achieves this efficiency without any E-Core (bigLITTLE-concept).
Qualcomm has unveiled the Snapdragon X2 Plus series for Windows laptops. Snapdragon X2 Plus SoCs bring up to 10 Nuvia CPU cores, a new Adreno X2-45 iGPU, and more. Performance-wise, Qualcomm is claiming big improvements in both CPU and GPU departments.