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Solved Double vs Single sided ram

July 15, 2010 at 13:11:07
Specs: any

I've seen many poorly answered questions about single and double sided ram and frankly it's amazing that so many people are getting this wrong. Especialy with the internet rescources at your fingertips. So listen up once and for all: The dif between single and double sided ram is this; Double sided ram has two groups of chips. (These two groups can be laid out on the stick in any configuration the manufacturer wants. Generally one group is located on each physical surface of the stick, but not always.)However, that is not why it is called double sided. This is; the computers memory controller sees each of those two groups of chips seperately and can only read/write to one of them at a time. In order to read/write to the other one the controller must switch back and forth between chip groups. NOW,...To settle the argument; Single sided ram has only one group of chips that the controller sees all at the same time. These chips may be laid out on one or both sides of the stick, it doesn't matter. All single sided means is that the chips are a single group that are used simultaniously, (now here it is) therefore making it MUCH faster than double sided ram.
Now for the fun part; finding single sided ram can be tricky. Sometimes ram that is denoted as "High performance or for extreme gaming" will get you some single sided ram. Otherwise, you might try this; Pins 33 and 45 on the board are used by double-sided memory, and can sometimes be an indicator as to whether a given module is single or double-sided. Happy Hunting!

Big E Custom PC


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✔ Best Answer
July 16, 2010 at 09:20:56

Hey, you're the one that started this thread & you're the one that claimed to know all about single vs double sided. You also chose the name "Big E Custom PC" which sounds like it could be the name of a computer shop, so it would seem that you came here as an expert to set all of us straight.

I gave you my answer which I believe to be correct:

single sided = memory chips on one side of RAM module
double sided = memory chips on both sides of RAM module

There is no rocket science involved in trying to figure it out. The rest of the crap you went on about involves "ranking" & that is a completely different issue. I posted a link that explains what that is all about. The following was taken from your favorite site to plagiarize, Wikipedia...it describes what single & double sided RAM is & how the terms *may* cause confusion when it comes to ranking:

"DIMMs are often referred to as "single-sided" or "double-sided" to describe whether the DRAM chips are located on one or both sides of the module's printed circuit board (PCB). However, these terms may cause confusion, as the physical layout of the chips does not necessarily relate to how they are logically organized or accessed."

It goes on to say that: "JEDEC decided that the terms "dual-sided," "double-sided," or "dual-banked" were not correct when applied to registered DIMMs."

http://en.wikipedia.org/wiki/DIMM#R...

I'm sure you know what JEDEC is AND the difference between registered & un-registered DIMMs.



#1
July 15, 2010 at 13:28:28

"I've seen many poorly answered questions about single and double sided ram..."

You just added to the poor answers. Good job...

"Otherwise, you might try this; Pins 33 and 45 on the board..."

Try what?

Skip
Audares Juvo


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#2
July 15, 2010 at 14:08:11

Pin one is usually labled on the ram stick. locate it and count from there. then visually inspect the pins corresponding circutry. If it is used on the stick it is double. If it is not then it is single. Don't give up so easily.

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#3
July 15, 2010 at 14:55:17

I'm looking on a 30pin stick and just can't find those pins.

Do I take it that what you say holds true with all memory sticks from 72pin on up?

And visually inspect the pins corresponding circuitry? Sure I will. Identify the pins, scrape labels off, get out a magnifying glass, etc.

My last question for the moment is how to do this if buying online or how to talk a store clerk into lettin' me do all this?

I may just continue to do it the hard way by looking up the specs for the system and matching the memory to those specs.

Skip
Audares Juvo


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Related Solutions

#4
July 15, 2010 at 16:10:17

Skip, I can't believe we've been doing it wrong all these years!

"I've seen many poorly answered questions about single and double sided ram and frankly it's amazing that so many people are getting this wrong"

Big E, you're confusing your terms so you may as well just join the "getting it wrong" club along with all the rest of 'em. I sure hope you don't run your own PC business?

Single-sided is exactly what it sounds like - the memory chips are only on ONE side of the RAM module. Double-sided is just that - the memory chips are on BOTH sides of the RAM module.

However, what you're describing is "ranking"...specifically, single rank vs dual rank. A RAM module can be single-rank, dual-rank or quad-rank depending on the chip configuration.

A single-sided module is always single-rank. Double-sided can be single-rank, dual-rank, or quad-rank.

This should explain:

http://www.ramcity.net/content/faq/...


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#5
July 15, 2010 at 16:15:09

Parts of the opening post are verbatim from this wikipedia article. Did you write the article, Big E, or are you plagiarizing it?

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#6
July 16, 2010 at 01:00:54

I don't claim to know everything, but just like all of you, I try to offer what I do know. And most of you don't seem to know much more than I do.

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#7
July 16, 2010 at 09:20:56
✔ Best Answer

Hey, you're the one that started this thread & you're the one that claimed to know all about single vs double sided. You also chose the name "Big E Custom PC" which sounds like it could be the name of a computer shop, so it would seem that you came here as an expert to set all of us straight.

I gave you my answer which I believe to be correct:

single sided = memory chips on one side of RAM module
double sided = memory chips on both sides of RAM module

There is no rocket science involved in trying to figure it out. The rest of the crap you went on about involves "ranking" & that is a completely different issue. I posted a link that explains what that is all about. The following was taken from your favorite site to plagiarize, Wikipedia...it describes what single & double sided RAM is & how the terms *may* cause confusion when it comes to ranking:

"DIMMs are often referred to as "single-sided" or "double-sided" to describe whether the DRAM chips are located on one or both sides of the module's printed circuit board (PCB). However, these terms may cause confusion, as the physical layout of the chips does not necessarily relate to how they are logically organized or accessed."

It goes on to say that: "JEDEC decided that the terms "dual-sided," "double-sided," or "dual-banked" were not correct when applied to registered DIMMs."

http://en.wikipedia.org/wiki/DIMM#R...

I'm sure you know what JEDEC is AND the difference between registered & un-registered DIMMs.


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#8
July 16, 2010 at 12:46:50

Thank you! That wasn't so hard. It's kinda funny what it takes to get you guys to just spill the beans. I've been on many sites trying to get someone to just tell me what they know about ram. And so far no one has said it quite as well as JAM. Sorry I had to spank the monkey a little bit, but I guess some poeple do their best work when their pissed off. :)
And Oh Yea, Thanks for copying your answers from someone else.

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#9
July 16, 2010 at 13:02:58

All you had to do was ask the question, not act the expert as you did in your original post.

Then you told me to count from pin1 (doh!) and not to give up so easily. Your entire post assumes each and every ram stick ever produced has pins 33 and 45 doing the same job.

You have absolutely no idea of what you're talking about so don't think for one second we're not gonna call you on it.

We're not mad at you but we will tromp all over a post that only serves to confuse others.

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Audares Juvo


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