CPU-Z shows Quad channel

[LUXIL]

Hi Guys, I would like to know why CPU-Z shows that I have Quad Channel when I have only 2 stick installed as Dual Channel. Is it bad or good :/ ?

Thanks

 

[Athlonite]

DDR5 is dual channels per Dimm whereas DDR4 is only single channel per Dimm so it's fine

 

[ThrashZone]

Hi,
Looks like it's too fast to read lol

 

[Wirko]

CPU-Z knows how much you paid for your DDR5 and is now trying to cheer you up. Don't worry, the piping from your CPU to RAM is still "normal" width, 128 bits in total. Most of the industry, including Intel and motherboard makers, calls it two-channel. The new thing about DDR5 is that each of the two 64-bit channels can operate as two separate 32-bit channels, and those are sometimes called "subchannels".

 

[W1zzard]

DDR5 is dual channels per Dimm whereas DDR4 is only single channel per Dimm so it's fine

Most of the industry, including Intel and motherboard makers, calls it two-channel. The new thing about DDR5 is that each of the two 64-bit channels can operate as two separate 32-bit channels, and those are sometimes called "subchannels".

That. It's just a slightly different way how CPU-Z names it

 

[mrthanhnguyen]

It is bad coz you have micron chip.

 

[ir_cow]

DDR5 shows up as quad because of the 2x32 bus to CPU-Z. It should still be dual channel. So Intel says, though Quad makes more sense from a technical standpoint.

 

[fadideeb]

Hello

please CPU-Z shows that my ram channel 4 x 32-bit
I have 16gb 2*8gb of ddr5 4800MHz

one of the ram is micron and the other one is kingston fury

what does that mean ?

 

[3x0]

Each stick is 2x32bit, so since you have two sticks it's 4x32bit

 

[fadideeb]

Each stick is 2x32bit, so since you have two sticks it's 4x32bit

thank you

 

[Benja]

Each stick is 2x32bit, so since you have two sticks it's 4x32bit

so that means dual channel as well?

 

[3x0]

4x32bit is dual channel DDR5

 

[LabRat 891]

Now that the question has been thoroughly answered...
Does that imply DDR6 will have 2x64-bit/stick?

 

[agent_x007]

Actually, it's more likely it's going to get 4x 16-bit (if it's necessary), than 2x 64-bit.
As using smaller width allows for more effective use of bus.
In 64-bit vs. 2x 32-bit example :
If you don't have 64-bit's to transfer one way, some part of bigger bus is wasted on each cycle.
While 2x 32-bit get's you a read of 32-bits from memory and at the same time write 32-bit in another part of memory (<== very simplified).
DDR4 dual rank memory does similar thing to ^this, that's why dual rank DDR4 is considered faster at the same clock speeds.

 

[Wirko]

Actually, it's more likely it's going to get 4x 16-bit (if it's necessary), than 2x 64-bit.
As using smaller width allows for more effective use of bus.
In 64-bit vs. 2x 32-bit example :
If you don't have 64-bit's to transfer one way, some part of bigger bus is wasted on each cycle.

Hm, that's all approximately true but I'd still add a few things.

Actually, one of the few things already known about DDR6 is that it will have four 16-bit channels per module (and will be twice as fast, which surprises no one). 2x 64-bit on one module would be next to impossible. For one, the connector would have to be twice as dense (more or less), or maybe implemented in two levels (like the AGP bus).

Many narrower channels do have a small advantage over fewer wider channels in theory but the memory controller just gets more complex, and it's complex enough as it is. I'm not even sure if client CPUs make use of those 32-bit subchannels. Server CPUs more likely will. Someone would have to create a specialised benchmarking program to prove or disprove that.

Narrower channels also have at least one disadvantage. The smallest unit of data transfer is 64 bytes (512 bits), that's one cache line. If you do that over a 64-bit bus, it will take 8 transfers = 4 clock cycles. If you do that over a 32-bit bus, it will take 16 transfers = 8 clock cycles.

While 2x 32-bit get's you a read of 32-bits from memory and at the same time write 32-bit in another part of memory (<== very simplified).

DDR5 is also not a dual port memory (if anyone thinks of it as such). One subchannel accesses one half of total memory on the stick, the other one accesses the other half. They are also interleaved, so it's not a simple divison like channel A = first 8 GB, channel B = second 8 GB. It's like channel A = first 64 bytes, channel B = next 64 bytes, and so on. So the benefit of narrower channels is pretty limited, I think.

DDR4 dual rank memory does similar thing to ^this, that's why dual rank DDR4 is considered faster at the same clock speeds.

Yes. However, a single rank DDR5 module is made of two mostly independent halves so it physically can't have just one rank. It has two. But if a CPU can't use two subchannels separately, it also can't take advantage of doubled ranks. By extrapolation, a dual rank module probably has four ranks?

 

[aQi]

The fact that ddr5 has sub channels. Well nothing wrong anywhere in your scenario just enjoy more bandwidth.

 

[mrod]

Im still a little confused. I have 4 sticks of 16 GB ram = 64GB ram (I used to have two, and I just installed the other two). So if it shows that I have 4 x 32bit Channel. Then I am running dual channel? Even though I should be running quad? It got me wondering if I mistakenly installed them incorrectly?

 

[Wirko]

Im still a little confused. I have 4 sticks of 16 GB ram = 64GB ram (I used to have two, and I just installed the other two). So if it shows that I have 4 x 32bit Channel. Then I am running dual channel? Even though I should be running quad? It got me wondering if I mistakenly installed them incorrectly?
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View attachment 284485

Everything is all right here. CPU-Z calls this config 4-channel (4x32) but others, including Intel and AMD, call it 2-channel (2x64).

 

[JohH]

Calling it dual channel is better and less confusing from a consumer perspective. But calling it quad channel is technically correct too. The total data width of 128 bits is divided into two channels each composed of 2 x 32 bit subchannels. Really there are 4 channels. So instead pay attention to the total data width. If it totals up to 128 bits, you're maxing out your Z690 board.

Secondly, going from 2 to 4 sticks should not increase the number of channels used. Unless the memory modules were plugged into the wrong slots prior (i.e. both were plugged into the slots wired to Channel A).

 

[ir_cow]

It's always dual channel for Intel 12/13th on the 1700 socket. What changes when you add more ram is the amount of ranks (pools of memory). Total of 128 bits for 2 channels of 64 each. With four sticks, two are sharing the same bus which is one extra level of complexity. On-fly switching is crazy when you thinking about slot trace lengths and delay signals so it all lines up. This is why 2x dual rank memory is easier to run at higher frequency vs 4 single rank. Less things for the cpu to deal with.

 

[Jony121]

Hello, I have built a new computer and I have a problem with the ram.
Can you give me some advice?

I'm using the
CPU: AMD Ryzen 9 7950X3D
ASUS Motherboards: ROG Strix X670E-E Gaming WiFi
2X RAM Desktop Kingston FURY Beast Black 64GB (2 x 32GB)
DDR5 5200MHz 1.25V 288-pin DIMM
Total 128GB RAM

Windows shows that it is running at 3600 MHz.
If I try to turn on higher MHz from the bios, it blocks and does not load anything
In CPU-Z I see, that ram number 4 shows it differently than the others, I don't know if it is damaged..
In the above pictures CPU-Z shows "Channel 4 x " but for me it shows 2 x

 

[ir_cow]

Windows shows that it is running at 3600 MHz I try to turn on higher MHz from the bios, it blocks and does not load anything
In CPU-Z I see, that ram number 4 shows it differently than the others, I don't know if it is damaged..
In the above pictures CPU-Z shows "Channel 4 x " but for me it shows 2 x

You have 128GB of ram 4x32B. Officially AMD only supports that at DDR5-3600. Probably the highest you'll get is DDR5-4800 if you manual set the voltage and stuff.

 

[ultron2099]

Hi Guys, I would like to know why CPU-Z shows that I have Quad Channel when I have only 2 stick installed as Dual Channel. Is it bad or good :/ ?

Thanks

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Hi Guys, I would like to know why CPU-Z shows that I have Quad Channel when I have only 2 stick installed as Dual Channel. Is it bad or good :/ ?

Thanks

View attachment 238165

View attachment 238166

View attachment 238167

Just an observational note, but your two chips of ram are be recognized as one (bank 3) running at 2800 cas 40 w/ 1.25v and the other (bank 4) running as 2600 cas 38 w/ 1.1v. Did you buy the 8gb chips seperately?