Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
On Thu, 29 Jul 2004 22:05:41 -0400, nospam@needed.com (Paul) wrote:
>In article <hu0jg0pqu41rhrpa8f1k3f2ek04jn22uu1@4ax.com>, dimize@nospam.com
>wrote:
>
>> Seeing how the memory only runs at 400 MHz when there are two DIMM's,
>> has anyone had any experience or benchmarks on which two slots it runs
>> best in?
>>
>> The manual states that DDR can run at 400 MHz in either slots 1&2 or
>> 1&3.
>>
>> I can only tell which slot is #2 as it is in the middle. I don't know
>> which is 1 and which is 3.
>>
>> Presently I'm running slots 1 & 3 but wondered if there was any
>> difference otherwise.
>>
>> Thanks,
>>
>> Dim-Ize
>
>The AMD processor drives the memory in the Athlon64 world. The S754
>socket processor has two address busses. One is connected to Slot 1
>(nearest the processor), and the second address bus goes to
>Slot 2 and Slot 3. To balance the currents in the busses, the
>address busses are the 1's complement of one another, but
>only the bus with active control signals on it is actually
>using the address info.
>
>In any case, with two address busses, there is hardly any
>difference between using Slot1 & 2 versus Slot 1 & 3. Assuming
>the majority of bus terminators are near slot 3, I would
>personally choose 1 & 3, without doing any further research.
>
>The most demanding part of the memory bus is the address.
>This is because all the memory chips on the DIMMs, (32 or
>48 of them, for two or three double sided DIMMs), are loading
>the bus at the same time. The data signals, on the other hand,
>are only one load per bank, or six loads for three double
>sided DIMMs.
>
>In terms of absolute best design, the A7N8X Nforce2 has
>three address busses. That means every slot has its own
>private address bus, and is the reason that board can run
>three sticks at DDR400.
>
>In terms of the difference it makes, picking good slots
>helps if you are overclocking the memory bus. When running
>at stock speed, picking good slots means having a low error
>rate on the memory bus (effectively zero, but it can never
>be exactly zero).
>
>HTH,
> Paul
Paul,
Not only did you answer my question, you educated me along the way.
Thanks allot.
It did help,
Dim-Ize