2400MHz or 2666MHz
2400MHz or 2666MHz
You're considering upgrading your laptop's RAM. Based on the speed you measured (2660–2669 MHz), it seems close to 2666 MHz. You might want to get something near that frequency, like 2666 MHz, since 2400 MHz is lower and 2659 MHz is a bit higher but still not ideal. Your current setup has 4GB DDR4, so adding more RAM could help performance. Just check compatibility with your laptop before buying.