Question GSkill ram running slower going to 32gb

[chrisbati]

Hello,

I have an Intel I9 9900k on an Aorus Z390 Master (Latest Bios, F11).
I was running with a kit of G.Skill F4-3200C14-16GTZ (2*8GB / 14-14-14-34).
All running fine with XMP profile activated, ram @ 3200MHz in the Bios dashboard.

I added the same kit to go up to 32GB ram.
Now in the Bios Dashboard the ram frequency is @ 3066MHz.

I tested each kit separetely, and for each kit I get 3200 MHz.

Why only 3066 MHZ with the 2 kits (4 modules) running together ?

Thank in advance for any advice.

Kind regards,

Chrisbati

 

[Fix_that_Glitch]

What bios are you running, F10 and above have a fix for native 3200mhz, it might help? There is this in manual: " When enabling Dual Channel mode with two or four memory modules, it is recommended that memory of the same capacity, brand, speed, and chips be used. " Did you add to the 16gb or did you buy a new 32gb set of ram? Check the new ram against the old ram and see if the memory chips match. Even though it may be the same brand and model the memory chips may differ.

 

[chrisbati]

Thx for your answer, as noted, I have F11 Bios

 

[Fix_that_Glitch]

Thx for your answer, as noted, I have F11 Bios

Sorry missed that , I added to my answer.

 

[chrisbati]

no problem !
I bought an additional 16gb kit, exact same kit as the first one.
When I check with CPUZid, I have the exact same information for each module.

 

[Fix_that_Glitch]

When you set the ram speed in xmp is there a second xmp setting, have you tried that?

 

[Fix_that_Glitch]

Also in bios if you look on page is there a selection for Dram Speed? Have you tried changing it from auto to 3200mhz?

 

[chrisbati]

I have only one XMP profile available.
I'll try to change DRAM speed and let you know.

 

[geofelt]

You have mismatched am.
Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
The internal workings are designed for the capacity of the kit.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards, can be very sensitive to this.
This is more difficult when more sticks are involved.
Ram must be matched for proper operation.
The motherboard recognizes this and lowers the settings to one that can work.

If you want 3200 speed, you may get it if you set the ram settings individually in the bios.
Likely you will have to increase the voltage past the normal xmp setting of 1.35v.

When done, check for stability.
Run memtest86 or memtest86+
They boot from a usb stick and do not use windows.
You can download them here:

MemTest86 - Official Site of the x86 Memory Testing Tool

MemTest86 is the original self booting memory testing software for x86 and ARM computers. Supporting both BIOS and UEFI, with options to boot from USB.

www.memtest86.com

Memtest86+ | The Open-Source Memory Testing Tool

Memtest86+ is an advanced, free, open-source, stand-alone memory tester for 32- and 64-bit computers (UEFI & BIOS supported)

www.memtest.org

If you can run a full pass with NO errors, your ram should be ok.

Running several more passes will sometimes uncover an issue, but it takes more time.
Probably not worth it unless you really suspect a ram issue.

 

[Fix_that_Glitch]

Try setting memory boot mode to normal. That will allow the mb to train the memory. You can also experiment with Memory enhancement settings, its default is Normal, there is Relax OC and Enhanced Performance I would try.