At their core, these two cards are nearly identical silicon: both share the same 2407 MHz base clock, 4608 shading units, 144 TMUs, 48 ROPs, and 1750 MHz memory speed. This tells you they are built on the same GPU die with the same memory subsystem, meaning their performance floors are indistinguishable under sustained load when both cards are thermally constrained.
The only meaningful divergence in this group lies in the boost clock. The Shadow 2X OC Plus reaches a turbo of 2602 MHz versus 2572 MHz on the standard Shadow 2X Plus — a 30 MHz advantage. That gap, while modest in absolute terms, cascades into slightly higher derived throughput figures: 23.98 TFLOPS versus 23.7 TFLOPS of floating-point performance, and a texture rate of 374.7 GTexels/s versus 370.4 GTexels/s. In practice, this translates to roughly a 1–1.5% theoretical performance lead for the OC Plus — noticeable in benchmark numbers, but unlikely to produce a perceptible difference in real-world gaming frame rates.
The OC Plus holds a narrow but clear edge in this group strictly by virtue of its factory overclocked boost clock. Both cards support Double Precision Floating Point, which is rarely relevant for gaming but useful for GPU-accelerated compute workloads. For a pure gaming buyer, the performance delta here is marginal; the decision will more realistically hinge on price and thermal/acoustic characteristics rather than this clock speed difference alone.