Your motherboard almost certainly supports dual-channel.

Yes, unless your board is from the Bush administration or a really cheap office special, dual-channel is standard. Even budget boards from the last decade support it.

The way to check: look up the motherboard model online. But honestly, you probably don’t need to. If your board has four RAM slots (or even two), dual-channel is almost guaranteed. The real trick is putting the sticks in the right slots — usually slots 2 and 4 (counting from the CPU), or 1 and 3. Check the manual or the silkscreened labels near the slots. Mismatched slots just run in single-channel, and you leave performance on the table.

If you’re still paranoid, CPU-Z (free) will show you if it’s running in Dual Channel under the Memory tab. But nine times out of ten, plug them into the recommended slots and you’re done.

Don’t overthink it — just make sure they’re in the right slots.