Micron 8GB SO-DIMM / DDR4 / PC4-25600 / 3200 MHz / For Parts or Not Working
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Listing Update (General)...This is not so much an update as it is a brief comment about the computers and related parts I have available for sale. Personal computers (and in particular desktop computers) have always been a hobby of mine. I've enjoyed tinkering with this stuff over the years and have accumulated a number of items during this time...some new and some used. I am not an expert on the subject...more of an enthusiast...but I will still do my best to answer any questions as it relates to my computer related listings. Thank you.

Listing Update (For Parts or Not Working)...The story behind this memory is I was upgrading the memory in a few laptops around the holidays last year. So I purchased a handful of different 8GB SO-DIMM memory modules from fellow sellers. I was able to use all of those memory modules except for this one. Over the past 9-10 months, I've installed this memory module in a few different laptops that needed a memory upgrade, but I have yet to be able to get a laptop to recognize this memory. It was represented by a reputable vendor back in December 2025 as preowned and tested, and to look at it, I see no visible damage. Anyway, I thought about keeping it for a while longer, to try it in other laptops that need memory upgrades, but I guess I just got tired of it laying around the shop. I paid $27+ for it back in December 2025 and it appears that prices have not changed that much in today's market. So I thought what I would do is make this memory module available for 1/3 my original cost with the caveat that this is a "as is, "where is" sale with no returns. So please understand what your are getting with this memory module. In other words, you may get it to work in a laptop, and then its a deal, but its also a real possibility that it will never work (and that is the risk you have to be willing to take).

Original Listing...
This offering is for a Micron (For Parts or Not Working) 8GB memory module. It is DDR4 (Double Date Rate - Type 4) SDRAM (Synchronous Dynamic Random-Access Memory) running at 3200 MT/s or MegaTransfers/second. This is not to be confused with the true clock speed of 1600 MHz x 2 (because DDR memory performs two operations per cycle). Said another way, MT/s is sometimes labeled as effective MHz, which is why we also see the clock speed of 3200 MT/s referred to as 3200 MHz. Then there is memory timing...measured as 11 for these particular memory modules. This number generally describes latency, which is the amount of time between memory operations (including the amount of time it takes for memory to respond to a data request). So in summary, higher clock speed numbers are better (because this tells us how much data our memory can move...send/receive...per second), while lower timing/latency numbers are better (because this generally measures the delay between memory operations).

I also want to confirm this a SO-DIMM (Small Outline Dual-Inline Memory Module) with 260 pins that is intended for a laptop computer. For those that are interested, you may also see this memory labeled as PC4-25600. This labeling indicates this module is unbuffered (or non-registered) and have a memory bandwidth of 25.6 GB/s (or 25600 MB/s). Please note the bandwidth (25600 MB/s) should not be confused with the transfer rate (3200 MT/s). At the risk of getting too far into the "weeds", all personal (x86) computers use a 64-bit (wide) memory channel. When this channel includes DDR4 memory running at 3200 MT/s, the bandwidth of 25600 MB/s may be computed as follows: 3200 MT/s * 64-bit channel * 1 byte / 8 bits = 25600 MB/s. Lastly, the PC4 part of this labeling is similar to the DDR4 labeling above. In other words, this labeling is an indicator of Type 4 memory running at a fairly standard voltage for Type 4 DIMMs (so this memory runs at 1.35 V).

Then there is the "1Rx8" labeling that refers to the memory rank. As I understand it, a memory rank consists of a 64-bit data bus of memory chips on a memory module. A "1R" reference indicates there is one (1) memory rank per module (so likely having memory chips on one side of a module, but now always, as is the case here), while a "2R" reference means there are two (2) memory ranks per module. As you might expect, "1R" memory is sometimes referred to as single-rank and "2R" memory as dual-rank (with the latter usually having memory chips on both sides of a module). In theory, dual-rank memory is generally considered better due to lower latency, because memory ranks can be accessed independently. I say in theory, because not all processor memory controllers are powerful enough to run dual-rank memory at the same frequency as single-rank memory. My research indicates that memory controllers on Intel 8th generation processors (or newer) and AMD Ryzen 3000 series processors (or newer) are capable of maximizing the benefits of dual-rank memory. So anything older in terms of a desktop processor may not be designed to take full advantage of dual-rank memory. Finally, there is the "x8" labeling. This refers to the bus width of the individual memory chips, and is related to the arrangement of the internal memory banks. For example, we know that each rank is a 64-bit data bus, so a "1Rx8" memory module will have 8 memory chips on it (64 bits per rank / 8 bits per chip = 8 memory chips). Generally speaking, the more memory chips on a module means more memory banks, which effectively decreases latency and increases bandwidth because accessing data in different banks is faster than accessing data in the same bank.

As mentioned above in the Listing Update (For Parts or Not Working), the history of this memory is that I cannot get it to work. So I am making it available at a discount with the caveat that this is an "as is, where is" sale and no returns.

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