difference between DDRAM and SDRAM

[Zbigniew Lisiecki]

Hi,
could somebody explain me, please what is the difference between DDRAM and
SDRAM. Has DDRAM somtheting to do with DDR RAM ? My special question is
also if my newly bought:

DDRAM,184-polig: Infineon 512 MB DDR PC400 ECC

fits into an Intel Server Board S875WP1
(http://www.intel.com/design/servers/s875wp1-e/), which specification
demands RAM of type:

unbuffered ECC DDR266/333/400 SDRAM 72-bit 184-pin gold plated DIMMs

Thank you in advance for your suggestions,
zbyszek

 

[Roy Coorne]

could somebody explain me, please what is the difference between DDRAM and
SDRAM. Has DDRAM somtheting to do with DDR RAM ? My special question is
also if my newly bought:

DDRAM,184-polig: Infineon 512 MB DDR PC400 ECC

fits into an Intel Server Board S875WP1
(http://www.intel.com/design/servers/s875wp1-e/), which specification
demands RAM of type:

unbuffered ECC DDR266/333/400 SDRAM 72-bit 184-pin gold plated DIMMs
...

You may look at the small paper label on your newly bought Infineon
module and consult
http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/prod_cat.jsp?oid=-8005

HTH - Roy

 

[Zbigniew Lisiecki]

You may look at the small paper label on your newly bought Infineon
module and consult
http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/prod_cat.jsp?oid=-8005

hi roy,

actually i didn't get the memorys yet, they'll arive in a few days.
does the title "DDRAM,184-polig: Infineon 512 MB DDR PC400 ECC" from ebay,
where i'v get them, still leaves the question opened if they fit to my
board ?

the page you'v mensioned says little to me, it's merely a starting point and
it didn't answere my question about the terminology. some people say SDRAM
means 168 pins, but Intel demands SDRAM 184 pin
z

 

[beav AT wn DoT com DoT au]

fits into an Intel Server Board S875WP1
(http://www.intel.com/design/servers/s875wp1-e/), which specification
demands RAM of type:

unbuffered ECC DDR266/333/400 SDRAM 72-bit 184-pin gold plated DIMMs

This doesn't make much sense to me. SD Ram is 168 pin and DDR is 184
pin. That and the fact that the slots to line up the chips are in
different places means that the two types of chips are NOT
interchangeable...

--
-Luke-
If cars had advanced at the same rate as Micr0$oft technology, they'd be
flying by now.
But who wants a car that crashes 8 times a day?
Registered Linux User #345134

 

[Zbigniew Lisiecki]

pon 5. of April 2004 09:20 "beav AT wn DoT com DoT au" <"beav AT wn DoT com

This doesn't make much sense to me. SD Ram is 168 pin and DDR is 184
pin.

that's what i heare also on other groups and a forum.
i asked Intel to refere me to the description of their terminology,
answere is expected in two days.
still if somebody has the explanation, give it here, please
z

That and the fact that the slots to line up the chips are in
different places means that the two types of chips are NOT
interchangeable...

you mean infineon ram won't go ?
o gosh

 

[Pen]

I think your confusion is arising from the fact that
DDR ram is the same type of ram as SDRAM. The difference
is in how it is used, therefore the extra 16 pins on the DIMMs.
Both types of DIMMs contain SDRAM, just that the DDR
ones allow the double density hookups. Don't read so much
into the SDRAM being on the DDR modules.

 

[Zbigniew Lisiecki]

you mean Infineon RAM, which i bought is ok for my Intel board, don't you ?
z

 

[Pen]

Should work.

you mean Infineon RAM, which i bought is ok for my Intel board, don't you ?
z

 

[Zbigniew Lisiecki]

that's what i heare also on other groups and a forum.
i asked Intel to refere me to the description of their terminology,
answere is expected in two days.

here is intel's answere:

Thank you for contacting Intel(R) Technical Support.
You might be confusing two types of memories, please see the description
below:

-168-pin SDRAM DIMM (dual in-line memory module)
-184-pin DDR-SDRAM (Double Data Rate-Synchronous DRAM)

The Intel(R) Entry Server Board SE7210TP1-E has been validated with
Unbuffered ECC and non-ECC DDR266, DDR333 or DDR400 memory.
Please see the URL below for a list of validated memory:
ftp://download.intel.com/support/motherboards/server/se7210tp1-e/sb/se7210tp1ememlist1.pdf

z

 

[General Schvantzkoph]

I think your confusion is arising from the fact that
DDR ram is the same type of ram as SDRAM. The difference
is in how it is used, therefore the extra 16 pins on the DIMMs.
Both types of DIMMs contain SDRAM, just that the DDR
ones allow the double density hookups. Don't read so much
into the SDRAM being on the DDR modules.

You obviously haven't a clue, SDRAM and DDR are very different. SDRAM
transfers a single word of data per clock, DDR (Double Data Rate)
transfers data on both clock edges. Also the power supplys voltages are
different, most SDRAM is 3.3V, DDR is 2.5V. SDRAM is an older technology,
all current motherboards use DDR.

The OP's motherboard requires DDR, it supports both ECC and non-ECC DIMMs.
I'd suggest that you buy your RAM from http:/www.crucial.com. The crucial
site has a RAM selector which will give you a choice of DIMMs that are
compatible with your board. One more piece of advice, get ECC memory (ECC
stands for Error Correcing Code, ECC DIMMs can correct signle bit errors
and detect double bit errors), it costs a little more but the extra
reliablity is worth it.

 

[Pen]

And you obviously don't read very well and don't have a clue
as to the questions being asked and answered. You should
read the entire thread before you mouth off with your
half assed criticism.

 

[CBFalconer]

This is excellent advice, and should save the OP much heartache
and grinding of teeth in the future.

And you obviously don't read very well and don't have a clue
as to the questions being asked and answered. You should
read the entire thread before you mouth off with your
half assed criticism.

Any missing pertinent thread data is due to your own carelessness
in top-posting and destroying continuity. I have corrected this
one.

 

[General Schvantzkoph]

On Tue, 06 Apr 2004 17:39:21 -0400, Pen wrote:

This is what you said, you said that DDR RAM is the same as SDRAM. Here is
your quote exactly.
It's not the same, it's a different architecture. I've been designing
computer systems for 30 years. I've used every generation of DRAM from the
4K generation (that's right K not M) to today's DDR RAMs. The DDR DIMMs
are larger because DDR RAMs have extra signals that aren't present on the
older SDRAMs specifically they have data strobe signals. You've obviously
never designed a CPU or a memory system, don't make statements about
things that you don't understand.

 

[Pen]

Well bully for you.
I think you must be suffering from Alzheimer's, perhaps
too much exposure to lead core solder? By deleting the
message I replied to you've destroyed the context of my post,
and really replying a year later. Unbelievable. Please let us know
who you allegedly design these memory systems for so we can
all avoid them.