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How would I determine the RAM latency in Windows 10 using wmic memoryChip or related commands in command prompt or else a related, built-in tool.

I'm not that trusting of third-party software that taps into my system's hardware, so please don't suggest that as a solution.

Reason for my question -

I have two slots of single channel ram installed in a PC I purchased for a family member, but need to upgrade. I don't particularly want to purchase dual channel ram for the entire PC and I'd rather take advantage of the 12 GB already in use on the PC rather than just throw that out. My understanding (perhaps incorrect) is that it is only single channel if I don't match the latency to new memory in the matching dual channel slot on the motherboard. Having the latency would allow me to purchase two matching memory modules.

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  • it doesn;t look like neither the wmic memoryChip or W32_PhysicalMemory classes has this information, which makes sense since timings a negotiated by the SPD, not the chip itself. TBH, timings aren't important at the windows level; if the SPD can't negotiate them, 'the RAM just doesn't appear to the OS at all. – Frank Thomas Dec 20 '17 at 14:45
  • I've added some edits to clarify, but in short I meant to say "latency" not "clock timing"... admittedly terminology is not my cup of tea, which is the main issue there! In terms of why latency is important, it is because I need to match two already installed ram modules to utilize dual channel ram. – Andrew Reinhardt Dec 20 '17 at 15:48
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This can be easily done within PowerShell using the following commands:

Get-WmiObject win32_physicalmemory | Format-Table Manufacturer,Configuredclockspeed,Devicelocator,Capacity,Serialnumber -autosize

This will give the following as output: enter image description here


You can also get this through Command line using the following command:

wmic memorychip get Capacity, MemoryType, Speed, DeviceLocator

..which would give the following output: enter image description here

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I think you can use wmic MemoryChip.

Example command:

wmic MemoryChip get BankLabel, Capacity, MemoryType, TypeDetail, Speed

where Speed is the parameter you need.

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  • This doesn't give the latency, though. – BenMorel Jun 30 '19 at 23:41
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After digging deeper, my original intention (to use already existent single channel memory and match using latency, speed, and size to a new memory set) is a seriously bad idea. There are several instances of individuals, in hindsight including myself, having bad experiences doing this. In my case, several years ago, a slight mismatch of latency on dual channel ram caused the memory upgrade for a PC to be essentially unusable.

If someone absolutely needs to pull the latency, there are third-party tools that I am aware of (CPU-Z, for example), that I personally would rather avoid but may be good enough for someone else. That said, for my purposes, I think I would advise that if your purpose for seeking the latency is the same as mine was, just don't.

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Single channel and dual channel rating doesn't matter so much to the dimms. technically, although it is often advertised as such, there is no such thing as "dual channel memory dimms" or "single channel.." etc. It all depends on whether or not your CPU/Motherboard supports dual or single channel config, you use the same dimms no matter what. The dimms probably have the latency spec printed on them. If not, you can google the model number and find more of that particular model. I do not recommend mixing and matching dimms, generally it just doesn't work. Also, ram timings are adjusted in BIOS on your motherboard, not in windows.

To summarize - if you want to tighten the timings and adjust voltage of your RAM, use BIOS. if you want to add ram to an empty slot, buy the EXACT SAME model that you already have, same capacity, same timing, etc. or it likely wont work. Or, most easily and effectively, look up what ram your cpu/mobo can run, and just buy all new ram.

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