Will my PC immediately get dual-channel memory if I install a second matching RAM stick?

Yes, if you plug it into the correct slots (usually 2 and 4 or 1 and 3), your motherboard enables dual-channel automatically with no BIOS tweaks. This gives 5-15% faster performance in memory-bound tasks like gaming or rendering. Just make sure the new stick matches your old one in speed, timings, and rank—ideally the exact same model. Verify with CPU-Z or Task Manager; if it says “Dual” under memory channels, you’re good.