ram unstable at rated speeds

[Celach]

Yesterday i finished building my pc but it seems the ram i bought is unstable when running at rated speeds. I bought everything on the US from amazon but now im back home in south america so i dont really know how easy or costly would it be to ask for a replacement. I have enabled xmp default profile and ive changed the settings manually in the BIOS but both seem to be causing game crashes.

Should i try to ask for a replacement or do i just settle for a lower speed? my ram is at 2133 mhz atm, while the rated speeds are 3000. I'd really like to use my ram at 3000 mhz since, from what ive read, higher speeds reduce stuttering a bit, but i dont really know if i should try increasing the ram voltage to have it @3000 mhz cause i dont know how badly it would affect the ram. Any guidance is appreciated, thanks

this is my pcpp: https://pcpartpicker.com/list/fQRJmq
p.s i havent tried middle ground speeds nor increasing the voltage to check if it gets stable.

 

[Darkbreeze]

Something not right. Temps should go up when you increase the level of LLC. There must be something else going on. IDK, unless auto was configuring a higher LLC than level 4, which is entirely probable. Automatic settings almost ALWAYS opt to the side of caution, which almost always results in higher voltages, higher temps, etc. Err to the side of caution in order to err to the side of stability. That's what automatic features tend to be programmed to do, which is why manually configuring practically everything that's possible, including overclocks, are always preferred.

 

[Karadjgne]

Not really, but sorta. Kinda. LLC kicks in after the cpu comes under a load. It adds voltage. So if your vcore was 1.34v and stable, under heavy loads like p95 you'd suffer vdroop and vcore would hit 1.26 or so, and bye bye stability. Consequently, with no LLC you'll need to set higher vcore so that you'll remain stable under loads when vdroop sets in hard.

So LLC was introduced to combat that. It adds a % of voltage to make up the difference. Now you might have set 1.34v, but if the cpu only need 1.28v then LLC 100% extreme will put your vcore at 1.34v and temps are higher. Drop LLC down to 67% and vcore will hit 1.3v, cpu is stable, but temps drop as well. Most OC is good with a 50-67% LLC, because you also have to take into consideration the fluctuation of the DC output of the psu, extreme 100% doesn't leave much room for varience, so you'd best have an extremely high quality psu with very tight, epic type outputs, as close to pure DC voltage as possible. Since most ppl don't buy platinum/titanium psus mostly Bronze or gold rated, you'll tend to get a slightly larger amount of possible vdroop as a side affect. Not that efficiency has much at all to do with outputs, but to get that efficiency, there's enough circuitry involved that outputs tend to be better regulated than lower efficiency models. Not always the case, but true in general.

 

[Darkbreeze]

Yes, we understand what LLC is and what it does. Bottom line is, when voltage drops to 1.28 there is going to be less heat as a result than when LLC keeps the voltage up around 1.35, or whatever, at full frequency, which of course is going to create more heat. So, not only in essence, but in point of fact, the higher LLC is set, the higher your full load temperatures are going to be.

No matter what, stability or lack of it aside, if LLC is higher, thermal condition will be higher. Always. Lower voltage will ALWAYS equal lower full load temperatures. And also less stability, to a degree, depending on various other factors. Sometimes too much voltage can cause instability as well.