What are the ranges of frequencies of RAM supported by TravelMate P259-G2-MG?

I'll try to be succinct, not to add to the confusion.

The memory controller nowadays lay in the processor itself, not in the motherboard, that's why the specifications for the processor (when talking about Intel) are as accurate as they can be, without overclocking (overclocking the memory in laptops is a no-no because it implies hacking its firmware too).

I very much doubt Acer overclocked the memory controller for that particular machine during manufacturing, it is possible, but I find it unlikely. It is wasy to see though, CPU-Z is capable of showing in a semi-real time manner (it polls ever X seconds) at which frequency the RAM is running. So does HWiNFO if that program is more to your liking.

Fire it up, you'll see the DRAM frequency alternating states, based on whether the computer is used or not, it's saving energy by running slower. For example, mine is resting at this moment so it downclocked:



If you do something, even if it is not as intensive as running Prime95 with large FFTs, you'll see that value ramp up, but my assumption is that it won't ever get past 1066.5-ish, which means the RAM is effectively running at 2133 MHz (double that). That would be because of the limit I talked about, because Intel chose 2133 MHz, to be the expected DDR4 frequency for non-soldered RAM for that processor. Mine is 2666 MHz:



There are times, in which because of shortage of components, or others being cheaper, faster graded RAM is put in a computer. For example a friend of mine had his A515-54G shipped with DDR4-3200 RAM. It worked, because the chip had a profile for running at 2133 MHz, but that's it, it won't be getting past that.

What's more, if you were after specialty RAM, performance-oriente RAM, they normally state the timings of the RAM for the speed it is rated at. They won't tell you the timings for 2133 MHz in my chip for example, even when it can and will run in a computer that only expect that, so it gets complicated comparing if you were looking for performance.

Look at the profiles of my RAM for example:



This 16 GB stick would work in your computer without a doubt, even though it is DDR4-2666 and it has 4 profile for running at that frequency (probably to accommodate, or play nice with other, less performant chips), it has 2 profiles for DDR4-2133 (starting from the bottom the two that list frequency being 1067 MHz. Hell it would even run in a machine expecting DDR4-1866!

But do you see those timings? (and those are but a few) They generally advertise the best ones and for the memory speed the RAM is rated at. In this case, they advertised it as DDR4-2666 CL15 (15-17-17-35).

And that's my whole reasoning for which RAM stick(s) to choose, knowing your limits, getting higher than that is something I'd only do if it's cheaper as it won't be going any faster than the limit.

I hope I didn't contribute to the confusion, but shed some light on it :S