OT: Strange memory reading (hardware)

Graeme Dargie arab at tangerine-army.co.uk
Fri Jun 17 14:22:31 UTC 2011

-----Original Message-----
From: owner-freebsd-questions at freebsd.org [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Robert
Sent: 17 June 2011 00:06
To: Chuck Swiger
Cc: freebsd-questions at freebsd.org
Subject: Re: OT: Strange memory reading (hardware)

On Thu, 16 Jun 2011 15:11:22 -0700
Chuck Swiger <cswiger at mac.com> wrote:

> On Jun 16, 2011, at 2:10 PM, Robert wrote:
> > I have tested with all of the sticks installed and with one at a
> > time. When all of the sticks are installed, BIOS show a total of
> > 2752 MB of RAM. If any of the sticks are installed alone in any of
> > the four slots, BIOS then shows 960 MB instead of the 1024 one
> > would expect.
> Sounds like the BIOS is stealing 64MB for video RAM.
> There's likely a BIOS setting which governs the size of this.
> As for not being able to access all 4GB, this is a FAQ.
> If you run a 32-bit system, the top gigabyte or so of address space is
> reserved for memory mapped I/O reservations like AGP, PCIe, etc.
> If your hardware is capable of running in 64-bit mode, do that.
> Regards,


Thanks for the reply. I should have been clearer. During POST only 2752
MB is shown.

Also, I am running the amd64 version of freenas.

As I said, I am 100% sure this is a MOBO hardware problem and I was
just trying to compute the math.

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The BIOS if it has shown 4096mb at post in the past would suggest that it is up to date at least enough to deal with 4gb of ram. I would say the likely hood of all 4 ram sticks developing the exact same problem at the same time while not impossible is highly unlikely. Do you have another machine you can test the ram in or stick of ram you can test on this motherboard? Not sure if your board will let you do this or not, but try 1 stick in bank 1 rather than bank 0, and see what it shows, you might also want to repeat the same test with 1 stick in bank 2 and then in bank 3. Bios settings for on board video will reserve some ram, some boards report the main ram figure less this figure others do not. You might want to try doing a bios reset with the jumper on the motherboard its self. Also give the ram slots a blow out with some aero duster could be there is some dirt in them. Other than running memtestx86 or the 64bit equivalent I am pretty much out of ideas.



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