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Re: P5Q changes memory rate set in BIOS

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      09-23-2010, 11:28 PM
dave wrote:
> I don't know if any running software in Win XP can do this, but my
> asus P5Q Delux occasionally changes the BIOS DDR2 DRAM frequency
> setting from 835Mhz to a value 667Mhz! (bsod's often result).
> Has anyone come across this problem and maybe knows how to fix it?
> Thx

When Asus needs to access hardware features, they generally do it by
using ACPI objects. The ACPI objects are announced by the BIOS (passed
in a table to the OS). They don't get used, unless an Asus driver gets
installed and makes use of them. I don't think any other software
knows or cares about it.

I suspect, if you installed AI Suite, it has AI Booster in it, and
perhaps that gives access to the memory clock. You could try uninstalling
it, and see if the problem stops. After a reboot, check Device Manager,
do a "View Hidden Devices" and see if there is any crap left over
from the AI Suite install. Just in case it is still happening.

Other than that, looking at and the reviews on Newegg,
there are the odd issue with memory on that board. Looking at the
BIOS release notes, there are several releases that claim to
"enhance memory stability". If you've already tried a few different
BIOS releases, maybe you already have some idea how flaky the BIOS
releases are for the board.

I don't have any Asus software installed on my Asus motherboard here,
and if I set the memory clock in the BIOS, the motherboard does
whatever it feels like (ignores my input!). So your symptoms could
also be viewed as a simple BIOS bug, with no OS hardware component at all.

If you want a "second opinion", try running memtest86+ and verify
the settings of the memory, on its control screen. That will tell you
whether the BIOS actually used the memory speed "835" or not.
(Because memtest86+ has no reason to be adjusting hardware settings.)
There is a screenshot example here. If you see 667 in Windows,
and 835 in memtest86+, then you know there is some AI Booster
magic at work :-)

By the way, when you're working with RAM, like your DDR2-835,
the actual clock for that could be 418MHz. Depending on the
utility or interface used, you'll either see references to
418 or 835. So don't panic if some number is 418, as that
number may simply need to be multiplied by 2 to get the
actual DDR rate. 418 is the clock, while 835 is the data
bus transfer rate.

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