Memory Frequency Issues

[antiguy1994]

So less than a week ago i decided to buy gaming desktop pre-built on newegg.com and i went with the asus rog strix GL10DH since it was good deal. It supposed to have DDR4 2666 Mhz but on cpuz it shows that its running at 1330 Mhz the ram speed is missing on task manager can't tell if really 1330 mhz. I looked up that you most of the time have to manually change this in the bios to make it use your max frequency or by using xmp or docp but my bios doesn't have ai tweeker or seem to have a option to adjust this.

 

i contacted asus support the rep. i talked with said my motherboard doesn't have this feature and told me it should adjust the frequency based on the process and that it is impossible for ram to reach its max frequency which is 2666 in my case but that sounds like a load of bull. So any advice on this would be appreciated i would like to get the speeds i paid for and take advantage of the ryzen performance with higher clock speeds. 

 

The bios and cpuz say the motherboard is the same model the desktop is which is the GL10DH but i found a article made by asus stating that its actually a special version of the asus prime b450m-k motherboard which is located in the paragraph under double trouble. So if you look up this motherboard on there website it shows a picture of there bios and it has ai tweaker in it so why does my bios not have it? Why would they take out the bios put a 2666 mhz ram with a ryzen 7 3700x and not have a option to overclock it? I read somewhere you can sometimes get past bios ocing locks with special chip is that even possible? I linked some pictures and websites in reference to my issues let me know if you need anymore information

 

Link to where I bought it and the Specs:

https://www.newegg.com/asus-rog-strix-gl10dh-nh764/p/N82E16883221574?item=N82E16883221574&source=region&nm_mc=knc-googleadwords-pc&cm_mmc=knc-googleadwords-pc-_-pla-_-gaming+desktop-_-N82E16883221574&gclid=CjwKCAiAzuPuBRAIEiwAkkmOSAgUSY2p_DSwF0SYcrAF2lSmRC8O7mbk-Csl9E0cxrQMioYG9krWSRoCX_4QAvD_BwE&gclsrc=aw.ds

 

Link to Asus Stateing what Motherboard it really is:

https://rog.asus.com/articles/coming-soon/the-rog-strix-gl10dh-packs-3rd-gen-ryzen-into-an-affordable-gaming-desktop/

 

Link to the motherboard page

https://www.asus.com/Motherboards/PRIME-B450M-K/

[Enderman]

1333 * 2 = 2666

It is running at the correct speed.

[Neggy-Z]

DDR is double data rate so you have to multiply by 2, 1330 x 2 = 2660, it's down 6mhz from 2666 probably due to the bclk not being exactly 100mhz.

[Oshino Shinobu]

3 minutes ago, Enderman said:

1333 * 2 = 2666

It is running at the correct speed.

Just expanding on this so OP understands why this is the case. 

 

The DDR in DDR4 stands for Double Data Rate. This means that the RAM performs two operations per clock cycle. 

 

The RAM is running at 1330MHz (which is basically 1333MHz) actual clock, but because it's performing two operations per cycle, this gives it an effect clock speed of 2666MHz, which is what RAM is typically marketed with. 

 

EDIT: Also, your ASUS support person is indeed talking nonsense. 

[-rascal-]

 @Oshino Shinobu and @Enderman is correct.

Just adding this diagram here:

 

 

You DRAM frequency is a ratio of your FSB.

In your screenshot, a 3:40 ratio...so assuming BCLK is 100 MHz, you get your 1333.33

 

BCLK is not always exactly 100.0 MHz; it can be something like 99.9 or 99.8 MHz.

Even the BCLK dropping down by a hair to 99.8 MHz, your RAM will show up at 1330.66 MHz.

BCLK = 99.5 MHz, RAM = 1326.66 MHz

[antiguy1994]

Thank you all for explaining what a Asus support rep for some reason couldn't.