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sets voltage, and timings ect..
auto will 'work' but best to select the highest freq lowset cl profile
Not running XMP is more likely to cause issues then running XMP.
If you have multiple profiles to choose from it doesn't matter which one you get. Check the ups and downs of each one, then decide for yourself.
also, if you bought those RAM sticks, their package probably has that information aswell.
Edit: another thing to keep in mind, do you have any other RAM sticks installed besides those G.Skill ones? RAM will aways run at the highest speed supported by all modules, so if you have a 2133MHz stick somewhere, then all run will run at that frequency.
https://www.cpuid.com/softwares/cpu-z.html
(ddr = double data rate, multiply freqx2 for speed)
if using different dimms, manually set them to the highext common speed with lowest common timings for those speeds
i've had some RAM sticks were the MB could not correctly identify the frequency and set them to the lowest possible. seemed to be a commom issue with that model. once the correct settings were configured on the BIOS everything was smooth, its been like 4y now.
Also I have Corsair Vengeance RGB 3466 MHz CL 16 and with ASUS Z370-F Strix and _TWO_ i7 8700K using it with XMP didn't worked. Bluescreens and failed memory test.
Using the MSI Z370 Gaming 5 though memtest86 didn't crash except when doing the multi-core one it always crashed at 4 seconds in for some reason. That crashed the whole machine so no memory errors in the program just a locked up machine.
Both boards threw a lot of voltage at it.
On the X470-Prime Pro and X470-F Strix using the same kit and Ryzen 7 2700X instead the claimed to be "safe" settings from Ryzen RAM calculator which is actually more aggressive at CL 14 results in crashes. Changing to CL 16 and it crashes too even though that's closer to the numbers it's supposed to be able to handle. 3333 MHz CL 16 I've just had one crashed browser tab with no idea if that was because of RAM or not but maybe it is a bit less stable than stock but nowhere near as bad as 3466 MHz.
On the ASUS board if you just set the frequency at 3200 MHz to see if that work rather than the XMP 3466 MHz it put 1.5 volt to the RAM and whatever SA and VCCIO.
I suggest you use as little automatic stuff as possible and stay with safer voltages and if it doesn't run with those then maybe scale things back instead rather than going with very high voltages and damaging your gear.
Completely wrong.
XMP is Extreme Memory Profile.
Neither Intel or AMD offer warranty (without paying for additional insurrance at least) for overclocking and it's overclocking and you aren't guaranteed positive results with XMP enabled.
The motherboard manufacturers will claim what RAM speed OC you can use on their boards but they don't guarantee that work because they will just blame the rest of the CPUs memory controller.
However like I tried with two different CPUs and none of those worked.
But neither Intel or AMD guarantee anything beyond the standard speeds you can find at Intel ARK and anything else is overclocking and you're on your own then.
As far as stability and lasting processor go you will definitely have less issues at stock.
If you only measure by performance then yeah you'll have "less issues" with the overclocked memory controller and RAM but you may get no boot whatsoever, crashes, data corrupted without you noticing and eventually destroy your components.
It's definitely safer and less "issues" just letting it run standard.
You can enable XMP but XMP isn't the safest way to run the RAM at those settings either. It kinda can't be in either direction. To reach a specific speed you could either go with lower voltages but then maybe chances are you easier get crashes but it's safer for your components or you can go with higher voltages which maybe work more reliably but is bad for your components. Also at very high voltages chances are things just go bad and it's no longer get better just as if you go with too low voltages even at stock speeds of course eventually that won't function/be reliable either.
There's very fast memory kits out there, upwards 5000 MHz, of course simply enabling XMP on a i7 6700K and expecting it to work will unlikely work. Then again poor example I guess because I guess the motherboard boxes didn't said 5000+ MHz RAM OC either but you get the point.
1cekiller: Register on overclocker.net and find some Intel motherboard / RAM / whatever forum category and ask what's a safe / reasonable way of using your RAM with the stuff you've got in the headline and list your processor, motherboard and RAM (exact model / frequency, timings and voltage) and wait for someone to give you a decent reply. I don't know what's good voltages but I'm pretty sure 1.35 or 1.40+ volt for SA and VCC IO isn't.
https://www.overclock.net/forum/5-intel-cpus/1571843-cpu-vccio-voltage-system-agent-voltage-stabilty-xmp.html#post24362874
6700K and someone complain how that post is making suggestions from the X99 platform instead so may not be a good one.
https://www.reddit.com/r/overclocking/comments/5pkwp6/recommended_voltage_and_speeds_to_overclock/dcryo8w/
"Safe Voltages (Always TENTATIVE):
Vcore: 1.45v/1.37v
VCCIO: 1.25v/1.2v
System Agent (SA): 1.3v/1.25v
Vdimm: 1.4v/1.35v
The first value shows voltages a pretty ballsy person can use. The voltage after the forward slash shows voltages for regular users who don't want to live on the edge. Refer to the disclaimer spoiler."
Intel of course doesn't recommend it:
https://www.pcgamer.com/intels-tells-core-i7-7700k-owners-to-stop-overclocking-to-avoid-high-temps/
"We do not recommend running outside the processor specifications, such as by exceeding processor frequency or voltage specifications, or removing of the integrated heat spreader (sometimes called 'de-lidding'). These actions will void the processor warranty."
Even though they sell the chips capable of it ..
If XMP on leave SA below 1.25 volt and VCCIO below 1.20 volt then you're at-least not above what the previously linked post said.