Question Adding new RAM / RAM speed ?

[Sarasti]

Hello.

My PC was originally running with Klevv Bolt XR (16GB x 2) DDR4-3600Mhz. In task manager it shows 2667Mhz . I bought a new pair of ram to add teamgroup T-force Delta (8GB x 2) DDR4 - 3600. The volts are the same for both new and old. At first after adding the new ram, the PC was running but the screen was blank. I decided to take out the old RAM and put in the new ones to see whether or not they were faulty. Fortunately it was not and the PC booted up, but I saw in Task Manager that the speed was 2400 Mhz. I eventually managed to boot up the PC with all 4 RAMs (48GB) and the speed is at 2400Mhz.

So my question is, why are the new ones slower than the old ones even though they are the same (except for the brand)? Is there anyway to increase the new ones to 2666Mhz like the old ones or will be the old ones always drop to match the slow one ?

Thank you.

 

[geofelt]

There are two related issues here.

1) You have mismatched ram.
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.

2) The default speed of the ram is 2400. 3600 speed is achieved by overclocking the ram.
The ram you mentioned is better binned and is capable of running at 3600 speed when overclocked. Usually this is implemented by specifying xmp.
That is not going to work with two different kits.

If your motherboard is capable of specifying ram specs and voltage, you can try to get things to work by explicitly specifying 3600 speed and increasing the ram voltage past the 1.35v specified.
I imagine you might have to go as high as 1.4v.

If it seems to work
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.

 

[Sarasti]

Thank you for your reply. I would also like to ask, if 2 RAM with the same specifications (same speed, volt and latency) but different brands, is it common for their speed (the one in task manager) to be different?

You also mentioned that the default speed of the RAM is 2400 and it can only achieve 3600 if overclocked. I was actually not aware of that, would you mind providing me a link?

 

[geofelt]

Thank you for your reply. I would also like to ask, if 2 RAM with the same specifications (same speed, volt and latency) but different brands, is it common for their speed (the one in task manager) to be different?

Yes, a motherboard that can not run at the speeds you asked for will try to find a speed that works. If successful, this will usually be the most basic and slowest speed.

 

[SkyNetRising]

You also mentioned that the default speed of the RAM is 2400 and it can only achieve 3600 if overclocked. I was actually not aware of that, would you mind providing me a link?

Please list model name of your motherboard. You can find it with CPU-Z - motherboard section.
Your board may not even support ram overclocking.

Then you may have wasted your money on overclocking ram, that your motherboard doesn't support.

And Task Manager is not a proper way for checking ram frequency. It often shows wrong values. Use CPU-Z instead.

 

[Sarasti]

I actually have not overclocked anything. XMP is disabled I checked.
My motherboard is B560m ds3 ac

 

[SkyNetRising]

My motherboard is B560m ds3 ac

It supports ram overclocking.
You have to enable XMP.