Jeff wrote:
> Narrowed down the problem to Ram but still trying to work around. The board
> will boot, install XP and run fine with a no name stick of PC2700 256Mb but
> will hang at various points with any of the other 3 sticks of PC3200 512Mb I
> have. Ive tried raising the voltage and loosing the ram timings but no joy.
> One of these sticks worked with its predecesor before it was RMA`ed so I`m
> at a loss for an explanation. I`ll be checking the approved list for new ram
> but if anyone can suggest a workaround so I can use my existing Ram I would
> appreciate it before I sink any more cash into this white elephant of a
> motherboard.
> Jeff
K8N is S754. The memory controller is in the processor, so the behavior
with respect to RAM, should follow the processor around. (In other words,
if a mobo+S754_proc behave crappy with regard to memory, moving the
processor to another board will likely not help. That is because the
memory controller interface is inside the processor.)
S754 is a single channel memory design. But there is a twist. The
data bus is shared by all sticks, so that part of the design is normal.
The processor has two address busses, and the addresses are pumped out of
phase. Only the DIMM being addressed at the time, needs the correct address,
and the DIMMs that aren't being accessed, get the 1's complement of
the address.
By doing that, the electrical switching noise is balanced. If a bit
rises on one address bus, the corresponding bit falls on the other
address bus. The purpose, is to try to reduce switching noise on the
processor die.
Now, how are the address busses wired ? The motherboard has three memory
slots. One slot gets its own address bus. The second address bus, goes to
the two remaining slots.
When populating memory, first you can occupy the slot with the private
bus. Next, you put the second stick on one of the second bus segment's
slots. Installing a third stick, tends to be the deal breaker, as then
there are two loads on that address bus. So the best configs would be
one or two sticks, and in the two stick case, I might try slot 1 and slot 3.
If you examine your motherboard manual, Table 1 and row 18 of the table,
shows the best configuration for two sticks of memory.
Notice how row 17 of the table (where slot 2 and slot 3 are occupied),
causes a big drop in the expected max speed possible. That is the bus
loading issue I was referring to. Double sided has twice the load of
single sided memory. And most people will buy double sided RAM, as it
is the most dense per stick.
You can try dropping the memory frequency, and/or change the "Command Rate"
to 2T. You can leave the timing alone, until you've tried those. I
think you'll find Command Rate to 2T is enough to fix it, as this is
primarily supposed to be an address loading issue. (On your board,
the setting in question is called "1T/2T timing". Change to 2T.
The auto setting should have worked, but maybe you can verify
what value was used while in Windows.)
You can try using CPUZ (
www.cpuid.com) to verify settings. At least
in the picture shown here, it appears CPUZ will show the Command Rate
value. But there are no guarantees, as on some chipsets, the Command
Rate register may not be exposed for examination by CPUZ.
http://www.lostcircuits.com/motherbo...mvp/cpuz1t.gif
Paul
> "JKBK" <> wrote in message
> news:RV3Ei.134704$fJ5.45157@pd7urf1no...
>> Just got my motherboard back from RMA and picked up a seagate 320 Gig HD
>> to reinstall XP and I`m having major problems. Mainly, the drive is
>> recognized by the MB, both in the bios and on the boot up splash screen
>> but hangs on installing XP when Windows tries to go to the setup/install
>> phase.I`ve tried using the drivers provided on the nforce 3 MB disk but
>> with the same result.
>> Any advice would be appreciated. Thanks
>> Jeff
>>
>
>