Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
Paul wrote:
> In article <tEyEe.200018$xm3.189540@attbi_s21>, PB <p00lb0y@insightbb.com>
> wrote:
>
>
>>Paul wrote:
>>
>>>In article <GBrEe.196879$xm3.167034@attbi_s21>, PB <p00lb0y@insightbb.com>
>>>wrote:
>>>
>>>
>>>
>>>>I did post a similar question a week or so ago, but hope for a little
>>>>more attention to a different title...
>>>>
>>>>I have a revision 2.0 A8V Deluxe with 3200+ Venice core processor.
>>>>
>>>>I have 4 pieces of Mushkin 512MB memory, PC3200, two matched pairs, all
>>>>four with microcircuits on BOTH sides of the panel. 2.5-3-3-7
>>>>
>>>>I cannot have all four installed and get the system to post or report in
>>>>Windows DDR400 (PC3200) speeds. Any pair in any sockets will work at
>>>>DDR400. I am not able to locate any product documentation that
>>>>indicates the system will NOT operate with 2 GB of memory like this I
>>>>have described. However, some Google hits have shown that the so-called
>>>>double rank (double sided) cannot operate at DDR400 speeds on some
>>>>mainboards with uncertain association with the A8V. Anyone care to opine?
>>>>
>>>>I have loosened the memory timings, upped the DIMM voltage, and
>>>>"shuffled" the memory panels to no avail. Also reset the CMOS.
>>>>
>>>>Anyone care to opine?
>>>>
>>>>TIA,
>>>>
>>>>PB
>>>
>>>
>>>Did you try "2T Command" [Enabled] in the memory section ?
>>>
>>> Paul
>>
>>Yes, I did try the 2T command and this did not correct the problem.
>>
>>I forgot to mention I also have 2GB of Corsair "Value Select" as 4 x 512
>>MB purchased as two separate 1 GB kits. These also do NOT all play at
>>DDR400 on this motherboard. Again, I [think] it is the both sides
>>populated that may be getting me.
>>
>>Thanks again, Paul. You responded to my original post.
>>
>>PB
>
>
> You say "get the system to post or report in Windows DDR400 (PC3200)
> speeds". I would think if the timing was off slightly, you would be
> able to POST, but there would be a measurable error rate in memtest86.
>
> Does two sticks in A1&B1 work and do you see 1GB of RAM ?
YES at PC3200 speed.
> Does two sticks in A2&B2 work and do you see 1GB of RAM ?
YES at PC3200 speed.
>
> If one of those combinations does not work, you could have a bad
> DIMM socket, a bad processor socket, or a bad processor (dead memory
> interface pin). If both of those combinations work error free, then
> there is something going on with the timing - either the processor
> is defective (speed fault - a failure of an interface pin to work
> at full speed), there is something wrong with the way the PCB
> of the motherboard was manufactured (controlled impedance is
> wrong), or the memory is not up to snuff.
>
> The thing is, if just one DIMM socket is bad, the motherboard
> will see three working slots, and that is an illegal configuration,
> because it doesn't support a dual channel configuration properly.
> Only two DIMMs or four DIMMs work in dual channel.
> That is why testing both pairs of DIMM slots individually,
> verifying you see the amount of memory you expect in Windows,
> is part of debugging why four DIMMs are not working.
>
> Setting the memory bus to DDR333, selecting Command Rate 2T, should
> virtually guarantee operation with four DIMMs. Those settings
> would even work on any version of Opteron. That should be
> "relaxed enough", to prove the four DIMMs are working and
> no sockets are defective.
All four DIMMS do work, but only at DDR333 speed. From another post you
wrote, I am getting the idea that the DDR333 may be the best I can
expect with 4x512MB=2GB memory.
Manual 2T command did not help (to get DDR400 speed, anyway).
>
> If you can get into Windows, get a copy of CPUZ (cpuid.com), and
> verify the timings and clock rates selected. Just in case something
> is accidently set more aggressively than it should be.
I have permuted almost all the settings in BIOS from no help to no POST.
>
> HTH,
> Paul
Again, thanks for the good suggestions.
PB