cancel
Showing results for 
Search instead for 
Did you mean: 

Understanding and using XMP

Praz
Level 13
XMP is often viewed as plug n' play when overclocking memory. As is the case when overclocking other system components memory stability may not be achievable by simply enabling XMP.


XMP will have been fully qualified by the memory manufacturer. This testing is done on a sample of boards the manufacturer has in there possession and/or by machine testing. The motherboard manufacturer likewise qualify specific memory sets for motherboards using provided memory sets, board samples and design/test data. The following are important considerations to keep in mind when relying on XMP as an overclocking option:


Using XMP is not running the system at default stock settings. Any memory setting that differs from JEDEC or processor manufacturer specifications is an overclock.


XMP is valid only for the set of memory that is purchased. Mixing modules or combining kits results in the XMP profile being no longer valid.


Regardless of what may be assumed from marketing XMP does not guarantee automatic overclocking. The tighter the timings or higher the frequency compared to stock specifications the more likely chance there is that the user will need to manually make some adjustments for stability.


To increase the probability of XMP being successful and when overclocking memory in general purchase memory kits one or two bins lower than the maximum the motherboard is qualified for.


The biggest variable of XMP being successful will be the capabilities of the processor's IMC. As with CPU speed memory overclocking success will vary from one CPU sample to the next.


When enabling XMP it is normal and should be expected that the board will alter other settings as well as voltages. These changes are set up to accommodate the processors at the lower end of the lot sampled. Especially with voltages it is the responsibility of the user to change these values to amounts that suit the particular CPU and configuration being used. Below are examples of some of the voltages that were altered by enabling XMP. As can be seen this CPU requires considerably less IO, SA and Standby voltages for stability than initially set.




XMP enabled

69408


69409




XMP enabled with IO, SA and Standby voltages adjusted to match the needed values for the CPU

69410

69411
209,034 Views
29 REPLIES 29

Raja
Level 13
Depends if you're going to overclock the CPU. If you are, select yes.

Hello,

I wanted to check the images, open them in bigger, but it wrote an error, that I do not have permissions.

Can you please allow me, so I can open them?

Thank you.
Regards,
Stefan

xherics wrote:
Hello,

I wanted to check the images, open them in bigger, but it wrote an error, that I do not have permissions.

Can you please allow me, so I can open them?

Thank you.
Regards,
Stefan


If you're logged in, simply click on them.
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Silent Scone wrote:
If you're logged in, simply click on them.


Well he had to be logged in to post his message. I've been getting this same error for months now.

Question on this XMP topic: if XMP is the first thing i've set AFTER clearing CMOS, tested ram for stability then rebooted, would there be any issues if i left XMP on and just altered all the other specs to OC the CPU and RAM?

F0x135 wrote:
Well he had to be logged in to post his message. I've been getting this same error for months now.

Question on this XMP topic: if XMP is the first thing i've set AFTER clearing CMOS, tested ram for stability then rebooted, would there be any issues if i left XMP on and just altered all the other specs to OC the CPU and RAM?


No problem at all.
NAME THE SANDWICH: – White Bread, Lots of Baloney, Russian dressing and served with a small pickle.?


Intel Core i7 8700K @5.1 Stable Delidded
Asus Maximus X Code

16 GB
G skill TridentZ DDR4 ​4266 (PC4 34100)
Corsair HX1000i digital
EVGA 1070 GTX TiSuperclocked+
Samsung NVMe SSD 960 pro M. 2
Samsung 860 Pro
Watercooled with EK block radiator fans etc.

Snakeyes wrote:
No problem at all.


Okay, thanks! I'll keep continuing to push the OC.

Silent Scone wrote:
If you're logged in, simply click on them.


Well, I am logged in and they do not work 🙂 That is the reason, why I wrote here.

BLOODCHILLER
Level 7
Hi all I have xmp enabled and I have run cpu - z seems my core speed in cpu section is going up and down 0799,2then 0800.2 then 4,700then 3900 ect ect is this normal ?

Yeah thats is totally normal operation called Intel SpeedStep. It reduces cpu speed and voltages automatically to lower power consumption. https://www.intel.com/content/www/us/en/support/articles/000007073/processors.html
https://en.wikipedia.org/wiki/SpeedStep

Hey guys, just a quick one.. I haven't encountered that before.

I ve bought a set of 16x2 GB Corsair RGB memory CL15 3000mhz.
If i select an xmp profile on my z490 G gaming it sets out unusual values.
FSB is set to 102.5 ( which i can understand due to 3000mhz ram) but it also sets out cpu cache ratio to 43.

I do not want to run it on these settings. This causes extra heat and extra fan noise. SO what I did is a manually set it to 100 FSB, I set cpu cache to auto, keep the CL15 timings and voltage 1.35( up from 1.2) but run in in 2933mhz instead of 3000mhz.

DO you think I did the right thing?