Ram question from an illiterate

i notice, for one example, as on my CPU's spec's that it's limited to supporting 2600 MHz ram, but the motherboards for my CPU all seem to support up to 3200 MHz

what is the controlling factor? When i bump my ram in BIOS to anything over 2600, i find it re-adjusted to 2133. If i adjust it to 2600 it seems to stay there for awhile, then spontaneously drops it back to 2133 ????

i'm getting ready to build a new rig, and don't want to waste money buying ram that will not be used, MHz wise

 
Solution
Don't use an "app" or automatic overclocking features. Those are just a waste of time for the most part and as you say, practically dangerous in some cases. I recommend avoiding ALL preconfigured overclocking profiles and desktop overclocking applications.

For ME, I recommend ALWAYS overclocking manually via bios settings/configuration. It's not hard. Actually, it's probably easier than a lot of common tweaks you probably do regularly in Windows.

This might be helpful. Yes, it's pretty basic, but basic is all you need to get started doing things manually and one of us, or any of the various advanced tutorials online, can help get you even further down the road once you get past the basics if you need to...
What is your CPU and motherboard model numbers?

Do you have the newest BIOS installed?

Let's see if we can determine why your memory isn't running at the correct speed on THIS configuration, before we worry about the next one. Of course I'll be glad to help you make sure you don't have any issues on the new build as well.

FWIW, CPUs ALWAYS show a lower memory support speed, usually whatever the highest default JEDEC SPD value is, but occasionally slightly higher than default, but it is usually not as high as what the motherboard supports IF you have a motherboard that supports a higher memory speed than the CPU shows. Really, it's practically always the motherboard that is the limiting factor, aside from the memory itself.
 

Crashman

Polypheme
Former Staff
2600 is a weird place to stop.
Intel Core i3 is limited to DDR4-2400. H370/B360 are limited to DDR4-2666. Intel K-series processors (apart from the i3-8350K) are unlocked up to the limit of the RAM. The LOWEST number is your limit for those: Put an i3 on an H370 and you're stuck at 2400 or less. Put an unlocked i7 on an H370 and you're stuck at 2666 or less.

AMD has different limits and more stuff unlocked, so someone else could answer that.

 


my current system is listed in my signature. Asrock only recently released the 2nd BIOS for that motherboard and it's been flashed
 

Crashman

Polypheme
Former Staff
It's unlocked. It shouldn't have any trouble running DDR4-3200. I believe I was getting to around DDR4-3733 on similar boards

 
thanks for the education, for your benefit i'll state the obvious - "computer illiterate"

Ram is 2800 MHz, and i purchased two 32GB kits (as no 64 GB kits could be found at the time) - CMK32GX4M4A2800C16 - that part # is on Asrock's qualified memory list

and i ran MemTest for 9 hours one time, with no errors
Matching ram sticks have been kept separate, one kit installed in all the "1" slots, and the other in all the "2" slots
 

Crashman

Polypheme
Former Staff
Great, so you're all set up. I'm glad we could help you tell us that :)

OH, the original question: Don't manually configure it, just turn on XMP.
 
whenever i try either XMP (#1 was preset at 2800 w 4.0 Turbo Boost as default and #2 was preset at 3000 w/4.4 TB) i get an immediate BSOD when system tries to boot

and another detail i forgot to state earlier, thinking the two 32GB kits might be too "unmatched", i've tried just running one set of sticks, and then the other set of 32GB, and with either set, i get the same results. But it was because of the BSODs that i tried 2600

i've managed to OC to 4.2MHz using Asrock's F-stream tuning app - it basically does all the work, BIOS setting wise, but i did go in and adjust the cpu vcore down to 1.35V (F-stream put it at 1.9V which gave me temps high enough to fry an egg.

I haven't touched voltages on dram
 
Don't use an "app" or automatic overclocking features. Those are just a waste of time for the most part and as you say, practically dangerous in some cases. I recommend avoiding ALL preconfigured overclocking profiles and desktop overclocking applications.

For ME, I recommend ALWAYS overclocking manually via bios settings/configuration. It's not hard. Actually, it's probably easier than a lot of common tweaks you probably do regularly in Windows.

This might be helpful. Yes, it's pretty basic, but basic is all you need to get started doing things manually and one of us, or any of the various advanced tutorials online, can help get you even further down the road once you get past the basics if you need to.

http://www.tomshardware.com/faq/id-3761568/cpu-overclocking-guide-tutorial-beginners-work-progress.html

Also, this, even though it isn't ASRock board specific, aside from some few settings and possible some of the nomenclature and naming schemes, a lot of it should be helpful:

https://rog.asus.com/articles/overclocking/rog-overclocking-guide-core-for-5960x-5930k-5820k/

I'd recommend putting the memory to the default speed and settings, probably 2133mhz, maybe 2400mhz, IDK for sure with those sticks on that board, but I think those early platforms all defaulted to 2133mhz unlike a few newer ones that are hit or miss on which they want to default to, while you work the CPU configuration and then worry about the memory afterwards.

If you are going to upgrade to a new system though, this might not even be something you want to mess around with right now.

I will say this, for the number of modules you are using, at the speed you wish to use them at, while Crashman certainly knows a hell of a lot more than I do, my advice would be that you are GOING to need to overclock the CPU AND you are GOING to have to increase the DRAM voltage, system agent voltage and VCCIO voltage, at least moderately, to get all those sticks to run at that speed.

Your biggest problem likely isn't getting either of those kits to run at that speed, that can probably be done far easier. It's getting two not-matched sets, with a total of four or more modules, at a HIGH frequency, to all run together. Regardless what anybody might say, running memory at high speeds with four or more modules is almost never a given. It will always require some work unless you are very luck AND buying ALL of the memory together in a matched set will of course help a lot. Buying very good modules, like those using Samsung B-die ICs, is probably also helpful when trying to do this on a consumer platform.


You might also try restoring EVERYTHING to it's default configuration, then enable XMP, THEN increase the DRAM voltage by steps of .005-.020v to see if they stabilize. You will be best off to begin doing this with only one module installed, then add two, etc. See where you end up. You may have to increase voltage incrementally AS you add more modules. I wouldn't exceed 1.4v and if you get that far and can't get all the sticks stable at that speed, I'd call it quits because it's probably not going to happen and if it does, running at higher DRAM voltage full time might be a less than desirable situation for a daily driver.
 
Solution
thanks - i'll try all that this evening (on the road right now), if for no other reason, practice & learning curve climbing. The F-Stream tuning app, i only discovered it 4 or 5 months ago, before that system was at default. I'll try the one stick at a time first, and actually was planning on putting one set of sticks (32 GB) up for sale as the new board only has 4 dimm slots
 
Combing multiple kits of memory is not guaranteed to work by Corsair or other manufacturers.

XMP profiles are for a Single Kit not Two Kits.

Due the extra stress placed on the memory controller by multiple kits of memory, you may need to run the memory with a:
1) lower memory clock speed
2) relaxed timings
3) increased DRAM voltage
 
Yes, but for timings at least, the XMP profile is usually a pretty good place to start. And, as I said, getting a kit with ALL of the modules you need is always a better option, but kits with that many modules are VERY expensive. Like 700 dollars plus expensive. I can understand not being able to afford to do that all at once. Still, the chances of success are a lot higher if you do.
 


thanks, but for what it's worth, it wouldn't accept XMP when i first built the system with only 32 GB (4 sticks), and as stated above, i've tried it since with each set (32 GB) only installed, and it wouldn't accept XMP settings with either set.

it always resets to 2133, and timings, hopefully there'll be some info on that in that link dardbreeze provided
 
Try XMP with only two sticks from the same kit. That is where I would start actually. Get two sticks working at the XMP profile settings and voltage, and then add two more. If no post, take two back out, increase DRAM voltage by .005v, save settings, power off, add two sticks back in, try to POST. No love, sticks back out, increase DRAM voltage another .005v, try again. Once those work, add two more, rinse and repeat.
 
just wanted to report back that after reading that tutorial you posted on OCing the Ram, i was able to take my ram up to 2600 MHz with no issues - i'm going to leave it there to see if it really is stable - it's been at that speed since last Thursday. But i think the mistake i was making before, not having read your tutorial, i "instinctively" assumed it was best to return BIOS to default settings, then set the ram speed, and then OC the CPU.

OCing the CPU, then going back and OCing the ram seemed to be the trick.

tks again

if it stays stable for a couple of weeks, i'll bump up to 2800 and see what happens