I’m attempting to replace faulty RAM and I am trying to understand the meanings of the label to make correct decision.

I have a 2GB stick of SAMSUNG RAM which appears to have gone bad.

The top line reads:

2GB 1Rx8 PC3-10600U-9-10-A0

The part number reads:

M378B5773CH0-CH9 1051

Doing a number of searches, I ended up finding this site which lists the manufacturers part number as:

M378B5773CH0-CH9 1110

Notice there is a difference my stick has 1051 but that website lists it as 1110.

What is the meaning of the part number, and the last 4 digits?

Is there a significant difference between the 1051 and 1110 that affect the machine?

  • Is that RAM stick causing some problems? Part numbers are, well, part numbers. They may have meaning for manufacturer, but not necessarily for end-user. If it works, then it's fine. If it matches your other RAM stick with capacity and frequency, then you can gain few percent better performance because they will work in dual channel. The rest doesn't matter. – gronostaj Aug 24 '14 at 22:00
  • I am not sure to understand what kind of answer you expect...This could be interesting Do you want to replace a faulty RAM ? I would say just buy one with required technical spec (DDR2, DDR3, Frequency etc...). You should not care about part number here – user2196728 Aug 24 '14 at 22:02
  • @user2196728 you have helped me. I'm not experienced with hardware replacement, but yes - I'm replacing the faulty ram and just need a fool-proof way to do it. – 1Up Aug 24 '14 at 22:08

Did you try to Google for 'Samsung RAM part number'. The first hit (on my search) lead me to this site, which exactly answers your question. Here is a picture of what's there:

Samsung DDR3 part number decoder

But, as stated by @user2196728 in the comments, part numbers are not the numbers you need to worry about when you're replacing the RAM. The following spec's must be the same for the RAM to work:

In order to make optimal use of dual channel (generally, it helps a bit) the following specs should be the same:

  • chip timings and CAS latency (in your case: CL9)
  • memory size (in your case: 2 GB).

When you replace all your memory or you buy a new computer, it is cost efficient to buy a pair of chips from the same manufacturer.

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  • Technically this answers the question, although I've discovered its not the thing I should be trying to understand. I'm replacing a RAM stick and thought the part number had meanings relevant to it's replacement. – 1Up Aug 24 '14 at 22:13
  • Added some info about how to replace your RAM. Hope it helps. – agtoever Aug 24 '14 at 22:40
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    Link no longer shows the picture, so thank you for including the image in the answer. :) – dannysauer Nov 28 '18 at 0:58
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    "Did you try to Google for..." yes, and it brought me here, and the link you found is dead now... – jrh May 25 '19 at 14:55

1051 and 1110 are the time codes when the chips were made: 1051 = week 51 of 2010; 1110 = week 10 of 2011. The format is usually YYWW, where YY is the year and WW is the week within the year.

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Just meeting specs does not mean the RAM will work in your computer. Samsung RAM is used in many HP desktops. Some older HP computers are strict on RAM. They have to have Low density chips on the boards. So, even though you match all the specs, but insert High density RAM on the HP boards, it won't work, you'll just hear beeps.

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A part number is an identifier of a particular part design used in a particular industry.

Every constructors have its own part number for its product.

More infos here

In your case, where you want to replace a faulty RAM stick, the part number is not important.

The most important things to consider are technical specs : Speed, Frequency, Type etc...

Find a RAM stick with required technical specs, regardless any part number.

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