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Old 07-03-2007, 08:28 AM   #1
Mega Man X
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Help to identify this RAM type!


Hi all!

I've a n00b hardware question. A friend of mine is willing to increase his computer's memory. I went to his place, opened the case, took one of the mem-stick out and on the stick, it reads:

Samsung 1Rx8 PC2 - 42000 - 444 - 12 - D3.

Now, what exactly am I looking at here? I mean, I can't find any memory like that in local stores over here. Is there any other type of memory "compatible" with this? I've "googled" for hours, without coming any where (except for links to eBay, which I don't want). I understand that it should be up to the motherboard to know that, but I could not read what type of motherboard it is. All I know it is a Intel motherboard and the PC is a Dell Dimension 9150. I believe that removing the processor would allow me to know the motherboard's name, but this computer build is so damn horrible that I am sure to break something before I remove the processor.

Ironically, I had the exactly same PC, but sold it a few months ago because I now officially hate Dell and that PC only gave me headaches.

Any help would be appreciated.

Thanks in advance!
 
Old 07-03-2007, 08:39 AM   #2
avallach
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The most common ram types are DDR ram and SD ram ..
If it has two cuts like this: it's SDRAM then .
If it has only one cut like this it's DDR. Another important thing is bus frequency, it is defined by your motherboard and you can read it when starting your computer in BIOS for example...
 
Old 07-03-2007, 08:59 AM   #3
Mega Man X
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Thanks a lot for the quick reply avallach!

I really didn't know about the cuts difference between those RAMs, thanks . I always forget to check the bios as well :S. I will check it again and post here.

Cheers!
 
Old 07-03-2007, 09:12 AM   #4
weibullguy
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That's not a part number. The part number will be just above the bar code on the sticker and probably begins with an M or a K.

This is what the numbers you have mean:

1Rx8 means 1 rank (row) of 8 chips (since it's a multiple of 8 you also know it is non-ECC)
PC2-4200 means DDR2 533MHz
444 and D3 are timing specifications

SDRAM means synchronous dynamic random access memory. DDR mean double data rate. DDR is SDRAM. Single data rate (SDR) SDRAM has the two keys and DDR has the one key. DDR has 184 pins on the module while DDR2 and DDR3 (double-pumped DDR) have 240 pins and the one locater pin is in a different location in the DDR and DDR2 since DDR2 is not backwards compatible with DDR.

Last edited by weibullguy; 07-03-2007 at 09:26 AM.
 
Old 07-03-2007, 09:24 AM   #5
Crito
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The Dimension™ 9100 / 9150 / XPS™ 400 system supports two channels of four sockets of 400 MHz, 533 MHz, and 667 MHz DDR2 memory, branded PC3200, PC4200, and PC5300, respectively. The 9100 / 9150 / XPS 400 launches with and ships PC3200, PC4200, and PC5300, unbuffered, non-ECC memory.

Like DDR, DDR2 is also SDRAM-based architecture with double data rate. But unlike DDR, DDR2 has some additional features:

* Dual DDRII SDRAM channels (can operate in single-channel mode, depending on configuration)
* Support for up to four double-sided DIMM modules (limited to two in the small form factor chassis)
* On-die termination to improve signal integrity
* Off-chip driver calibration
* 64-bit data interface
* 400/533/667 MHz (2x) system memory bus frequency (PC3200, PC4200, and PC5300 respectively)
* 1.8 V SDRAMs
* Support for memory densities of 256 MB, 512 MB, and 1 GB
* Maximum memory configuration: 4 GB (four 1 GB sticks)
* Variable page sizes: 2–32 KB in single-channel mode, 4–64 KB in dual-channel mode
* Support for Suspend to RAM
* Support for unbuffered DIMMs
 
Old 07-03-2007, 09:25 AM   #6
Mega Man X
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Amazing weibullguy. Thanks a lot. I will check with the BIOS as well to be on the safe side.

I went to one Online store and it looks like they don't have Samsung DDR2 533MHz. Is that ok to mix different marks as long as they are of the same type and speed or should I just replace his memory all together?

Thanks again for the help!
 
Old 07-03-2007, 09:27 AM   #7
Mega Man X
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Wow, thanks Crito. I've been at Dell's homepage, but did not find that. Thanks a bunch.

So, it looks like the motherboard also supports faster memory. Should I go with "PC5300 - 667MHz" instead?

Price wise, it is pretty much the same over here
 
Old 07-03-2007, 09:29 AM   #8
Crito
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For dual channel to operate correctly you usually have to buy them in matched pairs.
 
Old 07-03-2007, 07:20 PM   #9
Jorophose
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And if the RAM is faster than what you need, it's fine, but be careful if the speed of the RAM is slower than the minimum, you'll need to overclock and might kill it.

But definately DDR2, simply from the 4200 ; )
 
Old 07-04-2007, 06:26 AM   #10
Mega Man X
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Thanks all for the reply. As usual, LQ.org is great for asking questions not only Linux-related .

I will get 2GB RAM @ 667MHz(PC5300) then ^^.

Thanks again.
 
Old 07-04-2007, 04:15 PM   #11
Jorophose
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RAM is crazy inexpensive right now.

And they say it might drop even more (But just a couple bucks a stick) because of lack of Vista adoption; Kingston, Crucial, Corsair, OCZ, etc. all the "big" players stocked up and went crazy on RAM production for Vista (Only reason to buy a ton of RAM, other than smaller fish like Eclipse), but since no one bought it, they've got to get rid of it.

I'm hoping the 40$-for-1GiB-of-667MHz-stick phase will stay with us, or get better for the customers, within the next few months... Some say the prices might be going up higher because they want to move to DDR3, but IMHO, DDR2 is "good enough".
 
Old 07-05-2007, 08:54 AM   #12
Mega Man X
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Yup. The RAM price really surprised me. They are like half the price they were a few months(?) ago. Indirectly, Vista is then helping everybody. We can always use more RAM .

DDR3 is insanely expensive though... Reminds me of my old (and still bloody expensive) Rambus
 
  


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