P5P800 and 4 gig of memory

  • Thread starter Thread starter Joe Schmuckatelli
  • Start date Start date
J

Joe Schmuckatelli

We've got an issue here where a P5P800 motherboard (865pe chipset),
3.4GHz cpu, and four 1 gigabyte modules somehow equal 3776MB on
startup, instead of 4096MB. Remove any one of the modules, and it
says 3072 like it's supposed to.

I've got a call into Asus, and one of their Level 2 techs is supposed
to give me a call back, but I wanted to see if anyone in the group
could come up with any suggestions.


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Mr Schmuckatelli,

That is unfortunately normal. The hardware reserves space in the 32bit
address space for various functions and this comes out of the total address
space so when RAM is mapped, chunks have to get left out to leave the
regions the hardware has reserved.

Gettting 3776MB is excellent. On some motherboards considerably large
chunks of ram go "missing".

If you have one of the new "J" suffix Intel CPU's (IE with 64 bit support)
you may be able to get the entire ram - but this may require a 64bit OS
however. Windows XP64 is due out within a month or so.

HTH
 
Tim said:
Gettting 3776MB is excellent. On some motherboards considerably large
chunks of ram go "missing".
Click to expand...
Indeed. That's so high that I'm wondering if there is no agp aperture at
all...
If you have one of the new "J" suffix Intel CPU's (IE with 64 bit support)
you may be able to get the entire ram - but this may require a 64bit OS
however. Windows XP64 is due out within a month or so.
Click to expand...
No, this cannot work with intels chipset. There exists no current intel
chipset which supports memory remapping (outside of server space). Even
the upcoming i945 (lakeport) is supposed to be limited to 4GB. Only i955
(glenwood) should officially support memory remapping. Kinda funny if
you consider intel markets x86_64 as EMT64 (Extended Memory Technology)
but their chipsets can't handle the "extended memory" at all...

Roland
 
Thanks for those comments.

Do you have a reference for this? Suppose I could google. I have been coming
across a lot of references to AMD and memory remapping (articles, bios
versions), but not a sausage on Intel. They seem intent on releasing chips
'ahead' of AMD and saying next to sod all about them.
 
Tim said:
Thanks for those comments.

Do you have a reference for this? Suppose I could google. I have been coming
across a lot of references to AMD and memory remapping (articles, bios
versions), but not a sausage on Intel. They seem intent on releasing chips
'ahead' of AMD and saying next to sod all about them.
Click to expand...

only german articles, both from heise, both quite recent:
This one says i915/i925 doesn't support remapping,
http://www.heise.de/ct/05/05/096/
this one http://www.heise.de/newsticker/meldung/57433 talks about i945/i955.
(I did not look for references for the i8xx chipsets, I suppose it's a
dead sure bet they don't support it if the newer ones don't.)

Roland
 
That is unfortunately normal. The hardware reserves space in the 32bit
address space for various functions and this comes out of the total address
space so when RAM is mapped, chunks have to get left out to leave the
regions the hardware has reserved.
Click to expand...

Indeed. Would this also be the case with a 900-series chipset board?
Gettting 3776MB is excellent. On some motherboards considerably large
chunks of ram go "missing".
Click to expand...

I'll make sure and tell the customer that when he calls in again. :-)

Thanks -- your post was most informative.
 
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