We have established that you definitely can’t mix generations of DRAM. But it can lead to unpredictable results. If you are experienced at overclocking, it is possible to adjust the BIOS and other settings to tweak the performance of mixed-speed modules. If you are trying to save money, you will get the best value by purchasing an additional module with the same speed and latency. If you can afford to replace all the modules with faster, lower-latency modules, you will get the best benefit. The verdict? Possible, though you will lose the benefits of the more efficient module. If you wanted your DRAM modules to run at 1.35v, all of them would have to be 1.35v and your motherboard would have to support the lower voltage. What about DRAM modules with different voltages? You guessed it: both modules would run at the higher voltage.įor example, if you have a 1.5v module in one slot and a dual voltage (1.35v/1.5v) model in the other, your system will run at 1.5v. If your motherboard can only handle a 1333MHz module, then a 1600MHz module would run at 1333MHz.
Another thing to keep in mind is what speeds your motherboard can handle. The system will run based on the module with the slowest timings. The same thing happens with modules that have different latencies. For example, if you have a DDR3 1333MHz system and install a second module at 1600MHz, they would both run at the 1333MHz speed. While you can technically mix speeds, there is one important thing to note: your DRAM would all run at the speed of the slowest module. What happens when you install DRAM modules of different speeds?
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