Re: DDR memory settings?
- From: Joe Pfeiffer <pfeiffer@xxxxxxxxxxx>
- Date: 25 May 2006 14:08:46 -0600
David Wang <foo@xxxxxxxxxxx> writes:
Joe Pfeiffer <pfeiffer@xxxxxxxxxxx> wrote:
Recently got a new Averatec 7100-series laptope, and upgraded it by
adding some memory. Averatec specifies PC2700 (333 MHz) DDR memory,
which is what I got.
First thing after a memory install is, of course, to run memtest86+ on
it... and memtest86+ is reporting 100 MHz (DDR200) memory with
timings of 2.5-2-2-5. Went to the BIOS to adjust it, and found no
memory settings in the BIOS.
In the case of your laptop, the focus is on ease of use and lower
power profile. The memory system is sometimes downclocked on purpose
to save power. So my guess is that you have a DDR-200 memory system with
to way to adjust anything.
Found the answer (in AMD's BIOS writer's guide...). It turns out
that, depending on the configuration of the chips on the SO-DIMMs, the
CPU can decide that loading considerations mean it can't run at the
memory's rated speed. So it'll slow down the memory interface.
In this case, one of the memories is DDR400 and the other is DDR333
(and memtest86+ reports them as running at those speeds), but with
both in there together it slows down to DDR200.
--
Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605
Department of Computer Science FAX -- (505) 646-1002
New Mexico State University http://www.cs.nmsu.edu/~pfeiffer
.
- References:
- DDR memory settings?
- From: Joe Pfeiffer
- Re: DDR memory settings?
- From: David Wang
- DDR memory settings?
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