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This work illustrates the verification of the nTF/CTF multi-physics core solver for full core VVER-1000 analysis and more specifically the X2 benchmark. The coupled code system is compared with a solver of similar capabilities, Serpent2/SCF. The differences in the models and in the methods employed by the multi-physics core solvers are discussed in detail. Their impact is studied by comparing nTF/CTF with Serpent2/SCF for single VVER assembly calculations with different modeling options. Then, the two code systems are compared for the Hot Full Power (HFP) state of the X2 benchmark, which includes two phases, one with default modeling options for all codes, and one with consistent modeling options. Overall, nTF/CTF presents good agreement with Serpent2/SCF, in terms of power, temperature and boron concentration. The existing discrepancies can be partly attributed to the different methods and correlations used by the codes involved in the coupled code systems.