For example, my Asrock P67 Extreme4 says this:
- Supports DDR3 2133(OC)/1866(OC)/1600/1333/1066 non-ECC, un-buffered memory
Is RAM clocked at 2400 MHz compatible? Will the performance be downgraded or it just won't work?
I found other questions but they were related to the CPU cap at 1600 MHz. This cap is related to the motherboard, specs says 2133(OC) max.
Answer
The RAM would down-clock automatically to DDR3-2133 speed and it would run fine. This is safe and will only make you lose the speed edge of the faster module.
If there are more than one and they are different:
The RAM in your system will 1. all run at the same speed, and 2. run at the lowest supported speed by any one stick of installed RAM. Different sticks of RAM can NOT run at different speeds in the same system. The motherboard will make both RAM modules runs in the lower speed.
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