A7N8X-E Dx......... DDR-SDRAM PC 4000 7168MB

W

Wildbill

I just downloaded and ran CPU-Z, and found some interesting
information. Instead of two sticks of PC3200 memory, I seem to have
1 Xerox DDR-SDRAM PC 3200 512MB
1 Xerox DDR-SDRAM PC 4000 7168MB

Has anyone else heard of "PC 4000 7168MB" memory modules??

How accurate is CPU-Z anyway??

Thanks,
Wildbill
 
W

Wildbill

BIOS reports the following:

Base Memory 640K
Extended Memory 1047552K
Total Memory 1048576K

It also reports that I am running in Dual Mode. I thought memory
modules had to be the same to run in dual mode.

Thanks,
Wildbill
 
P

Paul

BIOS reports the following:

Base Memory 640K
Extended Memory 1047552K
Total Memory 1048576K

It also reports that I am running in Dual Mode. I thought memory
modules had to be the same to run in dual mode.

Thanks,
Wildbill

It looks like the BIOS is able to read the SPD on the modules
OK, but CPUZ is not. It is hard for software writers to extract
info from Asus motherboards, because the SMBUS is hidden from
them and Asus doesn't want to give info on them. Sandra has a
module called spdinfo, but it only works for a limited set
of motherboards as well. Proper support has to be worked out
laboriously, one motherboard design at a time.

For dual channel on the Nforce2, Ben says it will run in dual
channel mode, as long as there is some memory available on
each channel. Here are some examples:

--------- --------- It is like dealing from
| 256MB | | | two decks of cards, and
--------- | 512MB | alternating between using
--------- | | the two decks. In this
| 256MB | | | example, all of memory gives
--------- --------- dual channel performance.
2x256MB DIMMs + 1x512MB DIMM

Here is a second example:

--------- Here, only the bottom
| | portion of the two stacks
| 512MB | is matched, so the bottom
--------- | | 512MB gives dual channel
| 256MB | | | operation, and the top
--------- --------- 256MB does not.
1x256MB DIMM + 1x512MB DIMM

I really want to see someone write a memory bandwidth test
that demonstrates the correctness of these two figures. The
test should time how long it takes to write blocks of memory.
In the examples above, it would need to test the time to
write each of the (4) or (3) chunks of 256MB each. If the
two figures above are correct, the top 256MB of the second
figure should be slower than any of the other blocks tested,
by something like 4 or 5%.

HTH,
Paul
 
S

S.Heenan

Wildbill said:
I just downloaded and ran CPU-Z, and found some interesting
information. Instead of two sticks of PC3200 memory, I seem to have
1 Xerox DDR-SDRAM PC 3200 512MB
1 Xerox DDR-SDRAM PC 4000 7168MB

Has anyone else heard of "PC 4000 7168MB" memory modules??

How accurate is CPU-Z anyway??


7.5 GB of RAM Nice.
CPU-Z is a good little utility. Must be trying to take information from the
SPD chip. It's a bug in this case.

Try AIDA32 Enterprise from www.aida32.hu Under Motherboard|SPD| you should
find some information about your RAM.
 
W

Wildbill

Thanks for the help. I ran Aida32, and it reports both sticks as PC
3200-512MB

Thought for a while that I had something different

Thanks to everyone,
Wildbill
 
S

S.Heenan

Wildbill said:
Thanks for the help. I ran Aida32, and it reports both sticks as PC
3200-512MB

Thought for a while that I had something different

You're quite welcome.
Usually the information CPU-Z provides is accurate. Version 1.21 provides
correct CPU,cache, mainboard, and memory numbers for my boards. Perhaps it
has a problem with the newer A7N8X-E.
 
D

DreamMaker

You're quite welcome.
Usually the information CPU-Z provides is accurate. Version 1.21 provides
correct CPU,cache, mainboard, and memory numbers for my boards. Perhaps it
has a problem with the newer A7N8X-E.

Your telling us that you system is stable with a pc 4000 memorychip on
a motherboard that support pc 3200 max ???? have you try to run the
system only with that memory stick.


Interresting
 
S

S.Heenan

DreamMaker said:
Your telling us that you system is stable with a pc 4000 memorychip on
a motherboard that support pc 3200 max ???? have you try to run the
system only with that memory stick.


Where do you see me mention or imply the use of PC4000 ? The A7N8X-E Deluxe
will support any current 184-pin DDR SDRAM, up to and including PC4400, with
the possible exception of 2GB modules. The SPD chip sets the timing
parameters. Many users of a high-end board will disable SPD and set the
timings manually.
 

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