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Old 11-16-2008, 03:23 PM   #1
Odyssey1942
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What type of memory is needed?


I have found the following for:

hardware profiler:

sudo lshw

and

BIOS & MOBO profiler:

sudo dmidecode

But they do not show the vernacular in use when one orders memory, e.g.
"PC 3200 DDR400" or "PC5400 DDR2 667MHz"

in my computer, sudo dmidecode yields:

Memory Device
Array Handle: 0x001B
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: A2
Bank Locator: Bank4/5
Type: Unknown
Type Detail: None
Speed: 800 MHz (1.2 ns)
Manufacturer:
Serial Number:
Asset Tag:
Part Number:

If I understand the above, this would translate into "DDR800", yes?

But how does one determine the "PCabcd" part of the description and whether DDR or DDR2? Thanks.
 
Old 11-16-2008, 03:53 PM   #2
Junior Hacker
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If you know which mother board your computer uses, you can go to the mobo manufacturer's web site and download the manual for it and it will tell you exactly which type/types, and configurations you can use for different types if it can handle more than one type.
Sometimes you can find out which mobo you have through the computer manufacturer's web site. I use a utility called Everest ultimate edition to get all hardware information on computers I repair form within Windows. There are many utilities available that will tell you this information, but they are mostly ported to Windows. You can also open the case and look at it, it may be written right on it, usually between the PCI slots.
 
Old 11-16-2008, 04:04 PM   #3
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I don't know how to interpret the output of dmidecode, but if you have a dual channel capable mobo, you would put 400MHz memory in each channel to get 800MHz, which is capable of feeding an 800MHz FSB on a processor. Your best bet is to go straight to the manufacturer for precise answers.
One thing I did notice is this:
Quote:
Bank Locator: Bank4/5
Most mobos require you to use the first in line banks, dmicode may not be interpreting the information correctly.
 
Old 11-16-2008, 04:08 PM   #4
johnson_steve
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Or you could get a screwdriver, open the case and see what the little sticker on the ram says.
 
Old 11-16-2008, 05:53 PM   #5
teckk
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http://www.crucial.com/
http://www.crucial.com/systemscanner/index.aspx
 
Old 11-16-2008, 07:51 PM   #6
Odyssey1942
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Steve, thanks for the suggestion. Opening the case is easy. Getting the case out to open it is another thing entirely.

teckk, the d/l is an .exe file. Will this run in Linux?
 
Old 11-17-2008, 04:40 AM   #7
H_TeXMeX_H
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I would recommend you look up your motherboard and see what it supports.

However, you can find more information by running 'dmidecode' as root.

Last edited by H_TeXMeX_H; 11-17-2008 at 04:44 AM.
 
Old 11-18-2008, 07:33 AM   #8
Odyssey1942
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TexMex,

I have the original manual that came with the mobo and have downloaded the pdf. Neither specify the RAM except that it is DDR2 and will support 1066/800/667 MHz memory modules.

The demidecode output is shown in the first post in this thread.
 
Old 11-18-2008, 08:08 AM   #9
ptemmerman
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Quote:
Originally Posted by Odyssey1942 View Post
But how does one determine the "PCabcd" part of the description and whether DDR or DDR2? Thanks.
the PCabcd part is just another way of naming the memory speed.
If dmidecode says it's 800Mhz (DDR), then this means they are talking about PC6400 memory (6400MB/s throughput).

Here you have a summary:

Quote:
PC speed DDR MHz
PC-2100 DDR-266 133
PC-2700 DDR-333 166.5 (167)
PC-3200 DDR-400 200
PC-3500 DDR-434 217
PC-3700 DDR-464 232
PC-4000 DDR-500 250
PC-4200 DDR-525 262.5 (263)
PC-4400 DDR-550 275
PC-4800 DDR-600 300
PC-5300 DDR-662.5 (663) 331.25 (332)
PC-5400 DDR-675 337.5 (338)
PC-6400 DDR-800 400
PC-8500 DDR-1062.5 (1063) 531.25 (532)
PC-9136 DDR-1142 571
PC-9600 DDR-1200 600
PC-10000 DDR-1250 625
Starting PC-3500, it is assumed that it's DDR2 memory.
 
Old 11-18-2008, 08:09 AM   #10
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Ok then, then the board supports DDR2 RAM running at 1066, 800, or 667 MHz. From the dmidecode output, which you should look more closely at, you only posted a small part that doesn't include much useful info, you are currently using a DDR2 800 MHz. So if you want to stay with this speed simply buy another of this type. The marketing name for these is:

PC2-6400 = 800 MHz data & strobe / 400 MHz clock for address and control

see the wiki:
http://en.wikipedia.org/wiki/DIMM
 
  


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