What is the difference of DDR and DUAL DDR Memory

 > 1) What is the difference between the two?

It's similar to the old "two-way interleaving". Obviously dual DDR will give
you a slight increase in performance, as it helps to increase the
bandwidth, but it may be as little as 5-10%, if that.

 > 2) can DUAL DDR work with only one 512MB Stick or
 > does it require two 256MB Sticks?

You'll need two (dual). Can be two of anything, as long as they are the same
(2 x 256Mb, 2 x 512Mb). You'll have to refer to the motherboard manual to
find out which two DIMM slots to use, as some boards can be picky.

 > 3) Is there special memory or can any DDR 3200 stick be used?

Any speed can be used (2100, 2700, etc.) Some manufacturers test two sticks
and package them together (e.g. Corsair TwinX), but depending on brand
and/or quality, any old memory may work. I use 2 separately purchased
Samsung 512Mb PC3200 sticks on an A7N8X board without any problems at all.

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AMD AthlonXP 2400+ @ 2800+ (TBred-B, 13.5 x 166, 1.7VCore)
1Gb (2 x 512) Samsung PC3200 400Mhz DDR RAM (M368L6423DTM/CC400)<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: What is the difference of DDR and DUAL DDR Memory 

However, Dual DDR doesn't work more efficiently in athlon's motherboards. If
you want to use efficiently the dual channel, you must have a pentium
motherboard with i875 or i865 chipsets and a microprocessor with 800 mhz of
FSB.
 >> Stay informed about: What is the difference of DDR and DUAL DDR Memory 

On Sun, 31 Aug 2003 15:34:59 +0200, Miguel A. Muñoz wrote:

 > However, Dual DDR doesn't work more efficiently in athlon's
 > motherboards. If you want to use efficiently the dual channel, you must
 > have a pentium motherboard with i875 or i865 chipsets and a
 > microprocessor with 800 mhz of FSB.

First things first. No Intel cpu has a FSB over 200MHz (unless you
overclock it). The data rate is however twice that of a similarly clocked
fsb on the Athlon. The FSB width is the same for both the Athlon and P4
afaik. Neither CPU's benefit much from a dual channel ddr unless you have
something using the extra data of the memory bus. In the Athlon MB with on
board video, that would be the case. In the P4, assuming the chipset can
handle it, one could see the benefit to the cpu since the cpu's FSB is
quad pumped (QDR). Now dual DDR ram would equal QDR thus allowing the full
bandwidth of the fsb. Even with this, the benefit isn't as much as you
would think since many data accesses never actually go to the DDR ram for
their data, but get it from one of the cpu caches. This leaves all that
bandwidth only useful in certain applications.
So bandwidth benchmarks don't really mean squat in real world
applications. Probably why the single channel nf2 400 chipset outperforms
the nf2 ultra 400 dual channel chipset in most applications benchmarks.

IOW's don't be concerned with dual channel with AMD unless you have on
board video. There, it does make a difference, giving the video faster
access to the ram.

--
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 >> Stay informed about: What is the difference of DDR and DUAL DDR Memory 

"Miguel A. Muñoz" <miguemunoz RemoveThis @lycos.es> wrote in message
news:bistpq$cmns5$1@ID-151093.news.uni-berlin.de...
 > However, Dual DDR doesn't work more efficiently in athlon's motherboards.
If
 > you want to use efficiently the dual channel, you must have a pentium
 > motherboard with i875 or i865 chipsets and a microprocessor with 800 mhz
of
 > FSB.

Wow, are YOU misinformed.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: What is the difference of DDR and DUAL DDR Memory 

Pug Fugley wrote:
 > "Miguel A. Muñoz" <miguemunoz DeleteThis @lycos.es> wrote in message
 > news:bistpq$cmns5$1@ID-151093.news.uni-berlin.de...
  >> However, Dual DDR doesn't work more efficiently in athlon's
  >> motherboards. If you want to use efficiently the dual channel, you
  >> must have a pentium motherboard with i875 or i865 chipsets and a
  >> microprocessor with 800 mhz of FSB.
 >
 > Wow, are YOU misinformed.

What he said was probably not far off real life, unless you use onboard
graphics. Oh. and the 533 Intel boards are quad too.

Ben
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 >> Stay informed about: What is the difference of DDR and DUAL DDR Memory