Re: Using Corsair pc3200 512 mb x 2 value select _Double Sided_ ram modules in P5P800 SE motherboard. ADDITIONAL INFO + FEEDBACK


"Paul" <nospam@xxxxxxxxxx> wrote in message
news:nospam-0407061054530001@xxxxxxxxxxxxxxxx
In article <udtqg.15645$IU2.8884@xxxxxxxxxxxxxxxxxxxx>, "Sylvain VAN DER
WALDE" <sylvain.vanderwalde@xxxxxxxxx> wrote:

"Sylvain VAN DER WALDE" <sylvain.vanderwalde@xxxxxxxxx> wrote in message
news:...
Hello all.

I've just upgraded from a socket 478 motherboard (P4C800E de luxe) with
P4
2.8 ghz CPU, to a socket 775 motherboard (P5P800 SE) with D805 dual
core
CPU.
On the first board, I ran the memory (in Subject:) with no problems as
DDR
400.
Now, the second board's manual states (and I quote exactly): "DDR DIMMS
made up of 128 Mb chips or double-sided DDR DIMMS with x 16 (data bus -
16
bit) memory modules are not supported in this motherboard".
So, are my Corsair value select memory modules (not bad ones, by any
means) as described above?
Can I install them in the P5P800 SE motherboard, without fear of
damaging
anything?
What negative symptoms can I expect to get, if any?
Answers to my questions will be very wellcome.
Although I appreciate _all_ replies, an answer from Paul will make my
day.
I have read previous threads on memory in this group, but they are not
sufficiently relevant in this particular case.

Thanks in advance.

Sylvain.
p.s. I should have mentioned that I'm also using Crucial (Micron) 256 Mb
x
256 Mb, PC3200, _ DDR 400, Single Sided_ memory modules. They are in use
right now, but running at a lower speed (533 FSB).

Well, I know a few small facts about RAM, but I'm hardly the final
authority on the subject :-)

The text you quote, would appear to be extracted from an Athlon64
motherboard :-) It has no business in the P5P800 SE manual.
Remember, that the chipset used on P4C800-E (875) and P5P800 SE (865)
share a common silicon die. There are tiny differences in functionality,
placed there for the purposes of marketing, but the memory controller
section that handles address multiplexing and the like, would be
shared between them. There is no particular good reason, for the
population rules on those two motherboards, to be different.

You should be able to take any DIMM that worked in P4C800-E Deluxe,
and use it on P5P800 SE. (An ECC DIMM would no longer support ECC
operation, because the 865PE has no ECC bits on the Northbridge.)

This is from the 865PE Intel data***:

"* Support for non ECC.
* Supports 128-Mb, 256-Mb, 512-Mb DDR technologies
* Supports only x8, x16, DDR devices with four banks
* Registered DIMMs not supported"

The smallest capacity DIMM you can use, is 64MB, and would consist
of (4) 8Mx16 chips on a single sided DIMM. The largest capacity
DIMM you can use, is a 1GB DIMM consisting of (16) 64Mx8 chips.

From the 875P Intel data***:

"* Configurable optional ECC operation
* Supports 128-Mb, 256-Mb, 512-Mb DDR technologies
* Supports only x8, x16, DDR devices with four banks
* Registered DIMMs not supported"

One minor difference, is an unbuffered ECC DIMM used on an 875P
board, will not have working ECC on an 865PE board. But, as
far as I know, there should be no operational problems by using
the ECC DIMM. It just means the RAM chip used for the ECC check
byte, is not driven by the Northbridge.

I would say the memory is interchangable, with the small proviso
that the P5P800 SE would not support ECC protection, so an ECC
DIMM would not add any value to the operation of the motherboard.

Paul

Hello Paul, and all.
Your info was "spot on". All the memory appears to be working alright (room
temperature here in London, UK, is 85 F - 28 C). It's reported as: "DDR
frequency 333 Mhz, dual-channel, linear mode. The reduced speed being caused
by the Pentium P4 D805 CPU which has a 533 Mhz FSB.

Thanks again.

Sylvain.


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