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Maybe someone can enlighten me on these 2 systems...

by martylk2 / October 28, 2005 11:49 PM PDT

The system comparison is with Memtest v.1.65:

1. AMD Athlon 3200+, Asus A7N8X, 1GB Corsair XMS Pro DDR400 in dual channel. CAS 3 3 3 8

Memtest shows the AMD system to have a FSB of 200, memory frequency at 200Mh as DDR400 in dual channel.

BIOS shows FSB = 200Mh, Mem. = 200Mh.


2. P4, 3GH, Asus P5ND2-SLI, 1GB Crucial Ballistix DDR533 in dual channel. CAS 5 2 2 4

Memtest shows the P4 to have a FSB of 200, memory frequency at 133Mh as DDR266 in dual channel.

BIOS shows FSB 800Mh, Mem. = 533Mh.

Why would the Memtest show such a week memory and FSB in the P4 system? Is there something that needs tweaking?

Thanks for any understanding you can provide.

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Tell more about No. 2, the Intel
by Ray Harinec / October 29, 2005 2:17 AM PDT

Is that possibly DDR2? The CAS 5 smacks of DDR2. Either that or the memory really is crappy.

The Intel FSB can be confusing because they create the 800 MHz FSB by other means than simply using the memory clock. What can then happen is to have an 800 MHz FSB but a very poor memory bandwidth because the memory is only being clocked at 133/266.

Is it possible that you have something set incorrectly re the memory in the BIOS?? Have you tried running with "use SPD" and then try setting the CAS and other parameters separately?? Possibly memtest, only uses the SPD settings? Of this I am not certain.

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You are correct, it is DDR2...don't know why I forget that.
by martylk2 / October 29, 2005 2:47 AM PDT

The MoBo says it's running at 533Mh.

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You may have to check the Intel tech
by Ray Harinec / October 29, 2005 3:02 AM PDT

database documents, but I believe that with Dual Channel memory running at 533, the FSB at 800 MHz, the 3 GHz P4 is having its maximum memory bandwidth satisfied. [because at 400 MHz memory, 800 MHz FSB, the 600 plus max memory bandwidth is acheived].

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(NT) (NT) Thanks, Ray, for your helpful input.
by martylk2 / October 29, 2005 3:36 AM PDT
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(NT) I generally run everything in "auto"...
by martylk2 / October 29, 2005 2:57 AM PDT

The Intel machine is set to auto and the AMD unit was set to aggressive but I put back to optimal which puts the memory to "auto" and ran Memtest again. No change.

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your DDR2 is functioning as expected
by linkit / October 29, 2005 3:18 AM PDT
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(NT) (NT) Thanks, linkit, that satisfactorily explained it for me...
by martylk2 / October 29, 2005 3:35 AM PDT
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(NT) (NT) happy to share. Good luck with the machines!
by linkit / October 29, 2005 3:09 PM PDT
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