P4PE: 2 * 512MB won't work ?

  • Thread starter Thread starter nieuwslezer2002
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nieuwslezer2002

I've bought a second 512MB DDR-RAM module today, which looks like it
comes from the same manufacturer as the older one.
They both have 8 chips on both sides of the PCB.
Does this mean it is a Double Sided DIMM ?

But the PC won't function properly when both are placed in the memory
slots.
I've tried all combinations but it won't work.
The POST lady says something about the CPU being overclocked....

What's the story with this board ?
I can't make heads or tails of the documentation.
It says you can put memory in this combination:


DDR DIMM1 DDR DIMM2 DDR DIMM3
(Rows 0&1) (Rows 2&3) (Rows 3&2)
------------------------------------------------------------
SS/DS DS None
------------------------------------------------------------
SS/DS SS SS

How am I supposed to read this ? If the modules are classified as DS
does this mean that I cannot use both at the same time ?

I'm lost here. Any help would be greatly appreciated.
 
I've bought a second 512MB DDR-RAM module today, which looks like it
comes from the same manufacturer as the older one.
They both have 8 chips on both sides of the PCB.
Does this mean it is a Double Sided DIMM ?

But the PC won't function properly when both are placed in the memory
slots.
I've tried all combinations but it won't work.
The POST lady says something about the CPU being overclocked....

What's the story with this board ?
I can't make heads or tails of the documentation.
It says you can put memory in this combination:


DDR DIMM1 DDR DIMM2 DDR DIMM3
(Rows 0&1) (Rows 2&3) (Rows 3&2)
------------------------------------------------------------
SS/DS DS None
------------------------------------------------------------
SS/DS SS SS

How am I supposed to read this ? If the modules are classified as DS
does this mean that I cannot use both at the same time ?

I'm lost here. Any help would be greatly appreciated.
Click to expand...

Put them in Slot 1 and Slot 2. That corresponds to the first row
of the table above.

You may want to test the new memory by itself first, with a
program like memtest86 from memtest86.com. If testing one stick,
it goes in Slot 1 (AFAIK next to the processor - check the manual).

The other issue is overclocking - if you are trying to run a
FSB800 processor with some DDR400 (PC3200) ram, that normally
only works with one stick of memory. Two sticks have to
run slower than that to work.

As for "Whats the story", the 845PE Northbridge only has enough
control signals to drive four sides of memory. Normally, two
DIMM slots, with two sides each, would be enough DIMM slots to
use up the control signals. But Asus puts in a third slot, and
wires the left side of Slot 2, to the right side of Slot 1,
and vice versa. If a single sided stick is placed in Slot 2
and a single sided stick is placed in Slot 3, they both use the
"left" side of their slot and each gets a unique control signal.
If you attempt to put a double sided DIMM in either Slot 2 or
Slot 3, that uses up the control signals for both slots, so
a second stick cannot be inserted.

The allowed combinations are:

Slot 1 Slot 2 Slot 3
SS None None
DS None None
SS SS None
DS SS None
SS SS SS
DS SS SS
DS DS None

There are other electrical combinations that should work,
like DS,none,DS but the manual only seems to allow filling
from left to right (Slot 1 towards Slot 3). I don't know if
that is a real limitation or not. SS,DS,none should also
work, but line 4 of the table above is also a solution to
that case.

At DDR400 rates, i would expect only the first two rows of
the table to work. At DDR333, they might all work (the last
two rows of the table are the hardest to do electrically).

HTH,
Paul
 
The speed of the 2 sticks are the same, they even come from the same
manufacturer (Infineon) DDR266.
After some more testing, it turned out that the new stick is broken.
When it was the only stick in the PC, it would not come up.
I returned it to the shop today and got a new one.
I'm typing this while the 2 sticks are both in the PC.
The OS I'm using is Windows 2000.

Thanks for all the replies
 
I've bought a second 512MB DDR-RAM module today, which looks like it
comes from the same manufacturer as the older one.
They both have 8 chips on both sides of the PCB.
Does this mean it is a Double Sided DIMM ?

But the PC won't function properly when both are placed in the memory
slots.
I've tried all combinations but it won't work.
The POST lady says something about the CPU being overclocked....

What's the story with this board ?
Click to expand...

Do you have "Memory Mode" set to "Turbo" in BIOS? If you do, disable the
"Turbo" mode. Most of the time (if not always) it doesn't work with two
sticks.
 
I've bought a second 512MB DDR-RAM module today, which looks like it
comes from the same manufacturer as the older one.
They both have 8 chips on both sides of the PCB.
Does this mean it is a Double Sided DIMM ?

But the PC won't function properly when both are placed in the memory
slots.
I've tried all combinations but it won't work.
The POST lady says something about the CPU being overclocked....

What's the story with this board ?
I can't make heads or tails of the documentation.
It says you can put memory in this combination:


DDR DIMM1 DDR DIMM2 DDR DIMM3
(Rows 0&1) (Rows 2&3) (Rows 3&2)
------------------------------------------------------------
SS/DS DS None
------------------------------------------------------------
SS/DS SS SS

How am I supposed to read this ? If the modules are classified as DS
does this mean that I cannot use both at the same time ?

I'm lost here. Any help would be greatly appreciated.
Click to expand...

I have this board and 2 x 512M of Mushkin DDR400. They are running in
slot 1 and slot 3. I could not get it to run at DDR400 however, it
was not stable but it's running fine with the memory at DDR365 rates.

FSB at 146 Memory 2-3-3-7 clocks a 4:5 ratio.
 
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