Same RAM, Speed and Capacity
When it comes to timings, bigger values means more conservative, more relaxed, slower.
For example, by changing one of those 15 to 16 you mean you're giving the memory sticks 16ns instead of 15ns to reply to a command - the cpu will wait 1 ns more for the memory to reply and make data available before sending commands again to the memory. I'm over-simplifying things just to make it easy to explain.
At low frequencies like 2400 Mhz, there really shouldn't be any problem.
However, at higher frequencies, some motherboards - most often the ones on the cheaper end - have difficulties working with 4 memory sticks at same time, especially if they're of the DS type.
There's SS and DS sticks ... SS are easier to drive (work with) by the memory controller in the processor, DS sticks are a bit harder, so often if you use 4 DS sticks you can't quite get the highest frequencies... like you buy 4 x 8 GB DS 3200 Mhz sticks but you'd get crashes or problems, which go away if you run the sticks at 2933 or 3000 Mhz.
So you're mixing the memory types, you have 2 sticks that are SS and two sticks that are DS... as you run at 2400 Mhz like i said twice already I think, you're most likely gonna be fine. But just in case you get errors, it could just be one channel has harder time working with the DS sticks, so by loosening the timings you may get things error free again.
You may not have to raise the voltage all the way to 1.35v.. try combinations of looser timings and higher frequencies.
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