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Old 12-19-2008, 04:31 PM   #1
OR13
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RAM upgrade question


Hello!

My computer is a Compaq Evo-d510 with an Intel Pentium 4 CPU (1.80Ghz).
I currently have 2x256MB internal RAM devices:
Quote:
Handle 0x0024, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0022
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 256 MB
Form Factor: DIMM
Set: None
Locator: DIMM1
Bank Locator: Not Specified
Type: SDRAM
Type Detail: Synchronous
Speed: 266 MHz (3.8 ns)
Manufacturer: JEDEC ID:00 00 00 00 00 00 00 00
Serial Number: 30343000
Asset Tag: Not Specified
Part Number: ME256M333DDR

Handle 0x0025, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0022
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 256 MB
Form Factor: DIMM
Set: None
Locator: DIMM2
Bank Locator: Not Specified
Type: SDRAM
Type Detail: Synchronous
Speed: 266 MHz (3.8 ns)
Manufacturer: JEDEC ID:7F 7F 7F 0B 00 00 00 00
Serial Number: 15000000
Asset Tag: Not Specified
Part Number: NT256D64S88AAG-7K
I want to upgrade to 2x1GB internal RAMs.
I can choose between NCP ELPD7AUDR (PC3200) and ELPIDA EBD11UD8ABFB-7B (PC2100).

Since I know nothing about computer memories, and almost nothing about hardware, my questions are:
(1) Can I do this upgrade? Will these memories work with my computer? I checked, and physically they both fit to the memory slots in my machine, but will it work?
(2) What is the "Speed" criteria, and does it matter if I change both memory devices? Should I only put 266Mhz memories?
(2)b What are the speeds of the two memory types I mentioned? Does this has something to do with the PC3200 and PC2100 stuff?
(3) If I change the memories, can I just restart my computer and everything should work (I have Fedora9 with kernel 2.6.27.5-41.fc9.i686 and also WinXP Home), or will I need to define the new memory size somewhere?
(4) Is there anything else I should know before I do this change?

Thank you very very much,
O.R.
 
Old 12-19-2008, 05:04 PM   #2
JosipBroz
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PC3200 RAM is faster (which means, better), so if the price is identical, you should go for it. RAM can never be too fast, so don't worry about compatibility. Is that a laptop? Why don't you simply take it to the store, they'll be glad to swap the mem sticks for you and hopefully even take the old ones in for a small discount on the new ones. That way, you can also test the machine on the spot. The new amount of RAM will be recognized automatically on boot, and the computer may ask you to confirm whether the new RAM size is correct.
 
Old 12-19-2008, 06:29 PM   #3
lazlow
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The only potential issue I can see is that it looks like you have to use low density ram(not X4) with this motherboard. If you try to use high density ram the only side effect is that you will only see half the ram. I also did not see how much ram that motherboard could handle. Some of the older motherboards like this have some strange limits. I have seen a few that could only hand 1.5g (which is weird).
 
Old 12-19-2008, 07:39 PM   #4
thorkelljarl
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You should google!

The place for this for you should be on the net. The fact that the RAM stick fits is not the issue. They must match the type and timing for the board. Remember, buying the right kind is your responsibility, not the sellers. There will be a number on the RAM already installed. Google it for specifications and buy the same but larger. You might also google to see if the board does in fact accept 1GB RAM. Many manufacturers lied a little, or should one say were optimistic about their products. It's your money, but linux doesn't usually need 2GB of RAM, and you are spending money on an older system. There is the swap partition to augment your RAM if necessary. Whatever you do, Good Luck.
 
Old 12-19-2008, 07:41 PM   #5
jlinkels
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It's a Compaq. If you don't follow JosipBroz good suggestion, make sure the memory is specified to work with a Compaq Evo.

If you can't get 1 GB memory chips, settle for 512 MB. Only if you run virtual machines you need more, but Gnome/KDE perform good with 1 GB. The total amount you have now is too low, so upgrading is a sound decision.

jlinkels
 
Old 12-19-2008, 07:59 PM   #6
OR13
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JosipBroz
Yes, I can get both for about the same price.
I rather replace it myself - thanks for the tips!

lazlow
My motherboard is a Compaq 07E8h.
I don't know what low/high density means in the RAM field... Can you tell me how to check whether the memory types are mentioned have low or high density?
Anyways, I've seen this on the web (I emphasized the parts that I found interesting):
Quote:
Memory Details for Compaq / Hewlett Packard ( HP ) Evo 07E8h
Standard Memory : 128MB or 256MB (Removable)
Maximum Memory : 2GB
Total Memory Slots : 2
Memory Type : 184-Pin PC2100 (266MHz) DIMM
Notes :
I was happy to see that the maximum memory size supported is 2GB (the exact size I want to use);
The line about the memory type says PC2100 - is it possible that this motherboard doesn't support PC3200 after all?

Thank you both for your replies!
 
Old 12-19-2008, 09:03 PM   #7
lazlow
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A long time ago I could tell you. At one time you cold tell by low density had chips only on one side of the card and high density had chips on both side. Beings that you MAX(which I could not find) memory is 2GB and you have only two slots (yes?) I would not worry about it.

You can (almost always) use higher speed memory in a system that normally uses lower speed memory, it just runs that memory at a lower speed. Think about it like jogging with your baby brother, you do want to leave him behind so you just run slower.
 
Old 12-20-2008, 05:00 AM   #8
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First, thank you all for your replies!

lazlow - after reading your reply, in addition to what I read here ("Because DDR memory is backward-compatible, you can safely upgrade your system with any of the guaranteed-compatible DDR speeds listed below, even if your manual calls for PC1600 or PC2100 speeds.", and "Each memory slot can hold DDR PC2700,DDR PC3200 with a maximum of 1GB per slot."), I've decided to go for the PC3200 memory.

Thank you for helping me.
 
Old 12-26-2008, 12:15 PM   #9
OR13
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Thank you all.
Yesterday I installed the new memory (2x1GB PC3200).
My computer sees them both and it works now with 2GB of RAM (yei! ).
It sees them as 266Mhz (although they can handle 400Mhz), but I don't mind.

This is how it looks:

Quote:
Handle 0x0024, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0022
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM1
Bank Locator: Not Specified
Type: SDRAM
Type Detail: Synchronous
Speed: 266 MHz (3.8 ns)
Manufacturer: JEDEC ID:7F 7F 7F 7F 7F DC 00 00
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: HEXON

Handle 0x0025, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0022
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM2
Bank Locator: Not Specified
Type: SDRAM
Type Detail: Synchronous
Speed: 266 MHz (3.8 ns)
Manufacturer: JEDEC ID:7F 7F 7F 7F 7F DC 00 00
Serial Number: 00000000
Asset Tag: Not Specified
Part Number: HEXON
If anyone else wants to do what I did - it works. Good luck!

Oded R.
 
Old 10-01-2009, 08:56 PM   #10
Jim43
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Hello, I have the same motherboard and considering upgrading, but have a weird question that's bugging me:

Here are the 2 memory modules, I am about to buy one of them but which one?

1GB DDR-333 (PC-2700) DIMM Memory Module
LATENCY: 2.5-3-3-7
http://www.microcenter.com/single_pr...uct_id=0311104


OR

1GB DDR-400 (PC-3200) DIMM Memory Module
LATENCY: 3-3-3-8
http://www.microcenter.com/single_pr...uct_id=0256694

^now the 1st one has a slower clock speed and slower transfer rate (I believe), but the 1st one also has better latency (timing) then the 2nd by a little bit.


Should I just go with the "DDR-333 PC-2700" instead of the "DDR-400 PC-3200" since it has lower latency ?

Or is their a chance I could overclock the faster one and achieve better or performance ?

Same motherboard as above: Compaq 07E8h

Will this motherboard limit the clock speed and transfer rate, thus making it a better decision to go with lower latency memory ?


thanks for any advice I will really appreciate it !

Last edited by Jim43; 10-01-2009 at 09:24 PM.
 
Old 10-01-2009, 08:57 PM   #11
Jim43
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I should note that I use Windows XP home right now but thinking about trying linux soon.

Last edited by Jim43; 10-01-2009 at 08:59 PM.
 
Old 10-02-2009, 09:55 AM   #12
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No matter what RAM you get it will use the clock frequency set by the northbridge on the motherboard, which in this case seems to be 266Mhz (this is often listed in BIOS settings or the mobo manual). RAM sticks that are rated higher than this will still work but only at 266Mhz, so it's kind of a waste. So the best thing to do is get RAM rated at 266Mhz. The CL is less important than clock speed, it should only be taken into account when comparing sticks of equivalent frequencies, and even then, sometimes the mobo doesn't support it, only if you overclock. The RAM will still work but you won't get the listed CL. Really, as long as you get DDR RAM (and not DDR2 or DDR3) the RAM will work, but to save money you should try to get 266Mhz or close.

AS for the PC-#### it is redundant info:
http://en.wikipedia.org/wiki/DIMM#Speeds

Last edited by H_TeXMeX_H; 10-02-2009 at 09:59 AM.
 
Old 10-02-2009, 02:24 PM   #13
salasi
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Quote:
Originally Posted by Jim43 View Post
...but which one?

1GB DDR-333 (PC-2700) DIMM Memory Module
LATENCY: 2.5-3-3-7
OR

1GB DDR-400 (PC-3200) DIMM Memory Module
LATENCY: 3-3-3-8

^now the 1st one has a slower clock speed and slower transfer rate (I believe), but the 1st one also has better latency (timing) then the 2nd by a little bit.
Normally, if you run eg DDR-400 at a slower clock rate, you can tighten latencies somewhat, so there probably isn't much real difference between the two. In any case, running the memory faster without increasing the processor clock normally only makes a minor difference.

(This is, or was for the OP, a P4; because of their rather extreme architecture, the processor is more sensitive than most to latency, so it is more likely than most to show a measurable difference, but I suspect that is all that it will be, a difference that you can measure with a benchmarking program, but can't detect in any other way.)

OTOH, because the processor clock speed is related to the memory clock frequency, if having memory able to run at higher frequency allows you to move the processor frequency up, that can make more difference. Obviously, this isn't the only way of overclocking though, and isn't desirable in all circumstances.

Of course, if you later see any sign of instability (even much later), then you have probably gone too far and have to wind back your overclock.
 
Old 10-06-2009, 08:56 AM   #14
Jim43
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hmm, thanks guys, seems to be a wealth of information on this site.

I installed the DDR-333 (PC-2700) ram - I put in two 1gb modules for a total of 2gb and it's working very well, there is a noticable improvement when multi-tasking but speed on a single application is about the same.

Still, however, I am somewhat confused.

A couple people have told me the same as H_TeXMeX_H that the ram clock frequency is set at 266ghz by the motherboard.

But Salasi seems to be implying that I could overclock using the method he described to utilize the faster speed of the ram in some way.

So will moving up to a P4 3.06ghz with bus speed of 533mhz from my current P4 2.0ghz bus speed of 400mhz, allow me to utilize the faster clock frequency of the ram in some way ?

wow i just confused myself, hopefully someone can illuminate this issue a bit further, because I still feel like I'm somewhat in the dark.

Thanks!

Jim

Last edited by Jim43; 10-06-2009 at 08:59 AM.
 
Old 10-06-2009, 01:13 PM   #15
H_TeXMeX_H
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Well, you can (with the right BIOS options) overclock the RAM by changing the multiplier. But I doubt your Compaq has this capability. Take a look at the BIOS options, see if there is overclocking in there.
 
  


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