Given that the lamellae of semi-crystalline PE are thicker when formed at higher temperatures and that the NVE simulations heat up as crystallization proceeds, it would be reasonable to conjecture that clusters arising in the NVE simulations might exhibit longer stems. However, this is not the case. The chains composing the crystalline clusters arising in this study's NPT, NVT, and NVE nucleation simulations were analyzed in terms of both stems and folds (see Fig. ) with a focus on small clusters (i.e., the early stages of crystal formation and nucleation). The dependence of average stem length on cluster size is nearly identical for the NPT, NVT, and NVE simulations as is shown in Fig. , and the same is true for maximum stem lengths (see Fig. ). Moreover, there is also no discernible difference between the sets of simulations in terms of the number of folds associated with early-stage crystalline clusters (see Fig. ). It is worth noting that the stem length and fold results in Fig. and Fig. are qualitatively comparable to the results that Yi and coworkers previously obtained for PE crystal nucleation in smaller systems under NPT conditions using a modified version of Paul, Yoon and Smith's united atom model, highlighting that the coarse-grain SDK model is an appropriate coarsegrain model for probing polyethylene crystallization phenomenology. The ratio of the fold chain segments associated with a nascent crystalline cluster to the number of segments composing that cluster is comparable and evolves in a comparable fashion as crystal nucleation proceeds in the NPT, NVT, and NVE simulations (see Fig. ). Finally, clusters of a given size are on average composed of the same number of polymer chains regardless of whether nucleation is probed using NPT, NVT, or NVE simulations (see Fig. ).