Which one is better V2 or V3? All searches in google landing only at V2.
CM MWE 650W V2 vs V3
V3 has ATX 3.1 support which is the new GPU power port used in RTX 40 series GPUs. Just 1 cable for power, instead of 2 - 3x 8 pin cables earlier. I think 1 cable can carry upto 500-600W.