My Old Memory Modules

[army_ant7]

I have two old memory modules. I don't understand somethings written on them.
I find these on label stickers on the module:
What is AM1? (It's written on both the chips and labels.)
What is UNB?
What is NCTI 06- 04?

These ones I found on the RAM chips themselves:
What is 9LA and9LZ?
What is 22561615M-6B?
What is 16Mx16?
What is DDR-7-T? (I know what DDR means, but what's -7-T?)

I also can't find the manufacturer. Where is that usually located on the RAM?

Sorry for all the questions. If you you could answer all, I would be eternally grateful! LOL! Thanks

 

[army_ant7]

But the RAM is 128MB. Anyway thanks dude.

Does anyone know what AM1 and UNB mean?

 

[TheDraac]

Can you post a picture of exactly what your looking at....

 

[army_ant7]

Here:

They're kinda dark, but you can still see the AM1. The UNB is in the lower-left corner of the label.

 

[TheDraac]

I can't really see in your pics.... but I believe your chips are marked as follows....

AM1 9LA
22561615M -6B
??????? DDR-7-T

AM1 = Apacer Technologies, Manufacturer of the chips
9LA = Manuf code... date, run, lot (not sure, no specifics)
22561515M = chip id, model number
-6B = Usually the chips "speed grade"
????? , not sure what's there... is it the 16Mx16???
16Mx16 = Internal chip memory configuration. 16Meg bits x 16 bits
DDR-7-T = DDR, double data rate, -7-T = could be timing??? Not sure.

NCTI 06-04 = not sure where your reading that, anyway, I'm not sure... Manuf codes.

And finally UNB on the label = Unbuffered, the type of RAM normally used on desktop computers. Buffered memory is almost always used on servers and mission critical computers. Buffered memory data is more reliable.

I'd give you more info but I can't seem to find the needed datasheet on the 22561615m chips.

I will say it is PC2700/DDR333 with a CAS of 2.5.

 

[army_ant7]

Here, I'll try to mimic the label:

_________________________________
| (serial lines) P/N:73.74498.892 |
| (serial lines) S/N:2304255-01153|
| 128MB UNB PC2700 AM1 |

I can't put the under border of the label. LOL!

The other information is on the chips themselves... You already stated them.

Thanks for the info... I thought AM1 was something like AM2... LOL! Stupid me.

Thanks a lot though...

 

[army_ant7]

Yeah... It was just that I already know those. I just wanted to know about the rest of the info... Hehehe...

 

[wuzy]

What is 22561615M-6B?

...256... means 256Mbit per chip. Your module has 4 chips so 4x256/8=128Mbyte.
-6B means 1000/6=166.67Mhz (333DDR) and hence PC2700.

Since your module doesn't specify what timing it uses that means it'll default to JEDEC spec. which for PC2700 is 3-3-3-xx 2T. You can overclock and tighten its timing through more vDIMM of course, but your luck may vary.

 

[army_ant7]

WOW! So that's what the -6B means. And I didn't think of the x4 chips part. No wonder it adds up to 128 MB. Hehehe... I have a low I.Q. you see. LOL!!!

 

[army_ant7]

Here are some clearer pictures of my RAM's:

You'll notice that the NCTI is on the label to the side.

 

[TheDraac]

WOW, I was gonna disagree with wuzy on his 4 chip only description. As I've personally NEVER seen only 4 chips on a RAM module, and it was hard for me to notice only four chips in your original pictures.

I was however getting confusing info on the 22561615M -6B chip usage. I was seeing the same chips being used on 256MB modules with 8 chips and the 16Mx16 would in fact indicate 256Meg bit memory chips.

16Mx16 normally means an internal chip configuration of:

4Mbits words x 16bits x 4banks.
4Mbit x 4banks = 16Mbits
16Mbits x 16bits = 256Mbit So 256Mbits x 8 chips (1 byte = 8 bits) = 256 MByte or in your 4 chip module, 128 Mbytes.

So only 4 chips to make a 128MB module makes sense to me now. Wow, I've just never seen that before. 8 chips, 9 chips, 16 and 18 chips, but not just 4.

And you said CLEARER pictures.... My eyes are still buggin.... LOL

As for the NCTI, my guess is it's the module sellers ID label. Can't pin down any info on that tho.

Here's a link to some pictures of a 256MB module from a Chinese website, you can almost make out the printing on the chips.

http://goods.ruten.com.tw/item/show?11080214287162

 

[army_ant7]

LOL! Sorry... I only have a 2 megapixel camera on a cell phone... Hehehe... Sorry for not mentioning the additional info before. And, again, I have to say, thank you to all...