Combining 2400 MHz and 2666 MHz RAM is possible but requires careful setup.
Combining 2400 MHz and 2666 MHz RAM is possible but requires careful setup.
You're dealing with an MSI H110M Pro VD Plus motherboard that originally came with 8GB DDR4 RAM at 2400MHz. After two years, you're looking to upgrade and found a DDR4 8GB RAM stick compatible with your system. However, when you installed the new RAM in the correct slots, it only recognized up to 2133MHz, even though you had the 2400MHz model. When you tried enabling XMP, it disappeared from the BIOS settings and still stuck at 2133MHz. It seems the motherboard supports 2400MHz, but the newer RAM isn't being detected properly. You might want to check if the RAM is compatible with your specific motherboard model or consider using a different RAM speed that matches the system's capabilities.
Typically you shouldn’t combine different RAM rates. The best option is to match both RAM speeds—either by slowing down the faster type or speeding up the slower one.
Try adjusting the system settings to lower the clock speed of the RAM to 2400 MHz if possible. If unsure, consult your device's manual or contact support for guidance.
H110 boards lack memory overclocking features, meaning XMP isn't available. That's why you're limited to 2133 MHz. Still, 2x2133 remains significantly quicker than 1x2400.
There was an XMP configuration before I changed the RAM slots, but it only accepts 8GB of RAM when activated.
There was an XMP configuration before I changed the RAM slots, but it only accepts 8GB of RAM when activated.
XMP needs identical RAM rates, but your setup removes a stick when you turn it on. The setting isn’t available when you combine speeds.
Configure both units to JEDEC #8 from the second stick at 1200, with settings 17-17-17-39-55. The timing is more relaxed compared to the 1333 profile on the first stick, so the first stick will perform well with the looser timing and lower frequency range (1066–1333). Use Aida64 (any shareware version works) to access the full preset; most parameters are important, though others can remain at default settings.