Dual channel ram CPUZ

[Nicbloub]

Hi everyone!
Im having a little trouble with my ram sticks.
I use the b450m d3sh motherboard with 2 sticks of 8 gb ram.
I tried ram slots 1 and 3 and in cpuz, it was telling my i was in rank single
I tried ram slots 1 and 2 and same thing in cpuz.
Does my motherboard not support dual channel at all ?

[_I_]

post the cpuz validation url

[Illusion of Progress]

I guess it's something to do with certain systems. I just checked on my laptop and it shows dual. I thought it used to on this system (hence I thought it was a CPU-Z change with a recent version) but now if I'm wondering if maybe it always showed it this way and I might be mistaken. In any case, they both shows "dual channel (128-bit)" if I validate them.

[Illusion of Progress]

Początkowo opublikowane przez _I_:

post the cpuz validation url

It won't show the difference. Both systems validate as "dual channel (128-bit) DDRx SD-RAM". It's only in CPU-Z on the memory tab that I see this difference.

[r.linder]

Rank just notes if the RAM is single or double sided (chips on both sides). Channel # in memory tab will tell you if it's running single or dual channel.

[DevaVictrix]

Początkowo opublikowane przez 尺.し工几句ヨ尺:

Rank just notes if the RAM is single or double sided (chips on both sides). Channel # in memory tab will tell you if it's running single or dual channel.

I thinks it down to how many groups of modules there are. How else could you have quad rank?

[r.linder]

Początkowo opublikowane przez DevaVictrix:

Początkowo opublikowane przez 尺.し工几句ヨ尺:

Rank just notes if the RAM is single or double sided (chips on both sides). Channel # in memory tab will tell you if it's running single or dual channel.

I thinks it down to how many groups of modules there are. How else could you have quad rank?

Quad rank is with 4 dual sided DIMMs installed IIRC, I run 4 single rank DIMMs and it's still single rank in CPU-Z

[DevaVictrix]

But you can buy quad rank ram, and single sided dual rank ram.

[PopinFRESH]

Początkowo opublikowane przez 尺.し工几句ヨ尺:

Początkowo opublikowane przez DevaVictrix:

I thinks it down to how many groups of modules there are. How else could you have quad rank?

Quad rank is with 4 dual sided DIMMs installed IIRC, I run 4 single rank DIMMs and it's still single rank in CPU-Z

Rank has nothing to do with single or double sided. Its the number of "logical partitions" that are addressible on the dimm, or as DevaVictrix said the number of groups of modules on the dimm.

Początkowo opublikowane przez Crucial:

In other words, if a module has chips on both sides of the PCB, which makes it dual-sided, it can still be single-ranked, dual-ranked, or quad-ranked, depending on how those chips are engineered

What is a Memory Rank? [www.crucial.com]

[dOBER]

Its a little wired now. In cpu z memory tab it shows 4x32-bit with 2 ram sticks but after validation it shows quad channel 256 bit

[DevaVictrix]

Ahh… that’s a pretty good link! Thank you!

When I said earlier that “2x64bit” has nothing to do with ecc… that’s also wrong! If it’s 2x64bit then it’s definitely not ecc.

I guess the number of slots also must come into it though. Not so much that it allows for quad or octal rank but if you have say 8 slots not all can be used if you use high rank sticks. Possibly that a controller can only handle a max number of ranks and if you meet that capacity using 6 slots then the remaining two are redundant.

I’ll have a search tomorrow.

I started scratching my head earlier because I’m sure I remember having a double sided single rank ddr400 stick a looong time ago. I may be wrong but it tickled a memory.

I’ve still got some ecc buffered dual rank ram… I’ll install windows on that computer and see how cpuz reports that, for completeness!

[Illusion of Progress]

Rank definitely doesn't pertain to the number of sides there are chips on the RAM, although they do tend to coincide so people often mistake that as being a difference. I think quad rank RAM (on a single module) is a thing too, though probably mostly (or only) in the server space with very high capacity modules. If you notice, it's more likely that RAM that is "high capacity" for a given time is what tends to be more ranks. It might explain why all my systems through time have tended to be dual rank, as I tend to buy a lot of RAM.

Początkowo opublikowane przez dOBER:

Its a little wired now. In cpu z memory tab it shows 4x32-bit with 2 ram sticks but after validation it shows quad channel 256 bit

And there it is. I was going to ask this earlier if anyone with a 12th generation Intel platform could report what they saw on V 2.00 because I was wondering if it'd show 4 x 32-bit, and then you answer it does.

I did some searching earlier and there's a lot of comments, many of them recent (but also some not so recent) about this. All of them are from AMD users, saying they are seeing "2 x 64-bit" in the channel number field in place of seeing "dual" in V 1.99 and prior. I knew I wasn't dreaming it.

Some people theorized it was a change in CPU-Z reflecting other ways to show it, perhaps due to the change in how DDR5 RAM operates or something, and the other (older) mentions of it go back years and years ago on AMD platforms and involved the terms "ganged" and "unganged" being mentioned a lot which... elude me a bit as I don't know what those are as they were apparently AMD only things and I didn't use AMD back then (I've definitely heard the terms used years ago, maybe as far back as the Athlon 64 but at least since Phenom I or II, but I never bothered to learn what, specifically, it was).

Well, I guess that answers that then. It's definitely a change in the way CPU-Z V2.00 reports this on some systems.

[PopinFRESH]

Początkowo opublikowane przez dOBER:

Its a little wired now. In cpu z memory tab it shows 4x32-bit with 2 ram sticks but after validation it shows quad channel 256 bit

Do you have a new system with DDR5?

[Illusion of Progress]

Początkowo opublikowane przez PopinFRESH:

Początkowo opublikowane przez dOBER:

Its a little wired now. In cpu z memory tab it shows 4x32-bit with 2 ram sticks but after validation it shows quad channel 256 bit

Do you have a new system with DDR5?

Yeah, Dober has a 12th generation Intel platform with DDR5 from what I recall.

[PopinFRESH]

Początkowo opublikowane przez Illusion of Progress:

...I think quad channel RAM (on a single module) is a thing too, though probably mostly (or only) in the server space with very high capacity modules....

Nope, at least not yet anyway. The Dual channel per-DIMM was a design change with DDR5. When you get into higher capacity server modules that moves to using Load Reduced DIMMs (LRDIMM) which use a buffer and is named because of how it addresses the challenge of how accumulated capacitance impacts the signaling.

DDR5 also moves the power management and voltage regulation (PMIC and VRM) on module instead of relying on the motherboard, for similar reason but to address a different goal.

[Illusion of Progress]

Początkowo opublikowane przez PopinFRESH:

Początkowo opublikowane przez Illusion of Progress:

...I think quad channel RAM (on a single module) is a thing too, though probably mostly (or only) in the server space with very high capacity modules....

Nope, at least not yet anyway. The Dual channel per-DIMM was a design change with DDR5. When you get into higher capacity server modules that moves to using Load Reduced DIMMs (LRDIMM) which use a buffer and is named because of how it addresses the challenge of how accumulated capacitance impacts the signaling.

DDR5 also moves the power management and voltage regulation (PMIC and VRM) on module instead of relying on the motherboard, for similar reason but to address a different goal.

Oh, I meant to type "quad rank" (not quad channel) modules but had a word typo I guess.