I'm building my first PC gradually and my eventual goal is 32GB of DDR5 using two 16GB sticks. Would it be reasonable to install one 16GB stick now so the system is usable, then buy a second stick from the same store with the same brand, speed, and model later? I'm wondering whether compatibility problems or performance drawbacks make this a bad idea. The planned system uses a Ryzen 7 9700X, a Radeon RX 9060 XT, and a B650M Gaming Plus WiFi motherboard.
3 Answers
Buying the second stick later carries some compatibility risk, even if it has the exact same product number. Manufacturers can change the memory chips or internal revision over time, so two separately purchased sticks might not run together reliably with EXPO enabled. You may have to disable the memory profile or reduce the speed if the system fails memory training.
If the budget requires building in stages, one 16GB stick is a reasonable temporary solution. However, you’ll get better performance immediately and avoid the matching issue by waiting until you can buy a 2x16GB kit. Also consider that 16GB is becoming more of a minimum for Windows, games, and other applications rather than a comfortable amount.
It should work, especially with DDR5, and 16GB may be enough depending on the games and applications you use. Just remember that one stick runs in single-channel mode, so performance can be lower than with two sticks. If you already know you want 32GB, buying a matched 2x16GB kit now is usually the safer option.
I’ve seen two kits with the same advertised specifications use different chips, such as Hynix in one and Micron in the other. The PC worked only after disabling the memory overclocking profile.