Yes, that second stick will likely get you more than 10%.

You’re probably looking at 15–25% higher minimum FPS, and maybe 10–15% higher averages in Horizon Zero Dawn. That game loves memory bandwidth.

Single-channel RAM starves a CPU like yours. The i7-10750H has 6 cores and 12 threads, and with an RTX 2060, it’s a balanced setup — except you stuck 8GB in one slot. The CPU spends cycles waiting for data. Adding dual-channel roughly doubles memory bandwidth, and Horizon is one of those open-world titles that benefits directly.

Check benchmarks: Digital Foundry and others have shown that going from single to dual-channel can add 15–20 FPS in CPU-heavy scenes with a similar laptop config. 8GB total is still tight for modern games (you’ll want 16GB eventually), but the dual-channel jump alone is worth it.

This is one of the cheapest performance upgrades you can make. Do it.