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It generally functions well, matching the slower unit's pace regardless of frequency or CL. It’s a solid option if you already have it, but adding another RAM module should be done with matching specifications.
It could be that memory ICs vary between models, and not every different IC is compatible. However, if purchased together from the same seller, chances are high they match. If not, my experience suggests around 85% will run at XMP, 10% at regular speed, and 5% won’t work even at JEDEC standards. If you need a reliable 2x8GB or 2x16GB setup, consider buying a dedicated kit for certainty, though it might still function otherwise.
If we were discussing OEM Samsung/Hynix bare PCBs with identical model numbers or bare RAM modules sharing the same IC, it would consistently work reliably. Visual checks confirm this on platforms without major issues. For sticks with matching clock speeds—like a 1900 DDR3 D9QBJ and a 2200+ PSCS—performance remains stable on standard boards. All components are bare PCBs, so compatibility is key. If they belong to the same IC family (e.g., 3200C16), expect different I/O options but still functional. Exceptions arise with Samsung Bdie chips; pairing a low-bin and high-bin stick may cause OC issues due to inconsistent behavior. My recommendation is to purchase complete kits for hassle-free performance or opt for specialized OEM parts if you're an overclocker. Prioritize genuine components, avoid confusing branding, and ensure proper I/O selection to secure solid OC results without compromising reliability.