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9.9

Am I getting the most from my new memory?

Asked by korz in Computer Motherboards, Hardware Components, Computer Memory (RAM)

Tags: FSB, Multiplier, memory speed

I've got an Asus P4P800-E Deluxe motherboard, P4 2.54GHz cpu, and just changed

from 2 x 512M of Mushkin HP2100 (high-performance PC2100) cas 2-2-2 memory

to 2 x 1G of OCZ PC3200 cas 2-3-2-5 memory.

1. When I go into my BIOS, it says that my FSB=533MHz.  Memtest86+ says FSB=133MHz.
Which is right?

2. Even though my RAM is PC3200 (DDR400), memtest86+ says RAM: 167MHz (DDR334).
Does this mean that my memory is running at a slower rate than it can?

As I've read about it, the FSB runs at the clock rate.  The clock multiplier (or bus/core ratio) is multiplied times the FSB and that's the speed at which the CPU runs.  In my case, if I believe the AI Booster utility that came with my mobo (see attached .doc file), is 133.64 x 19, which results in the 2.539GHz that the CPU is running at.  That part I understand.

The memory, typically runs at the FSB, but because I have DDR memory, the effective rate of the memory is twice that, right?  But then Ai Booster says FSB is 534.55, although that doesn't match up with what my memory is rated at or the DDR334 that memtest86+ says I'm running at.

3. Am I getting the most from my memory given my mobo, cpu, and memory?

4. Shouldn't I be able to run my memory at DDR400?

5. Will I compromise my system stability if I mess with these clock rates and multipliers?

6. If I happen to have an additional 2 x 512M of PC3200 memory with a CAS 2-3-3-6, would I be slowing down my system by adding them to my motherboard, which currently has 2 x 1G of PC3200 CAS 2-3-2-5?
Attachments:
 
AI-booster.doc (353 KB) (File Type Details) 
Asus Ai Booster screenshots (had to split it in two).
 
[+][-]04/19/09 10:14 AM, ID: 24179780Expert Comment

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[+][-]04/19/09 11:36 AM, ID: 24180083Author Comment

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[+][-]04/19/09 12:19 PM, ID: 24180230Expert Comment

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[+][-]04/21/09 11:39 AM, ID: 24197587Accepted Solution

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About this solution

Zones: Computer Motherboards, Hardware Components, Computer Memory (RAM)
Tags: FSB, Multiplier, memory speed
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Solution Provided By: Callandor
Participating Experts: 2
Solution Grade: A
 
[+][-]04/21/09 08:28 PM, ID: 24201231Author Comment

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[+][-]04/21/09 08:51 PM, ID: 24201311Expert Comment

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[+][-]04/22/09 12:38 PM, ID: 24208701Expert Comment

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[+][-]04/22/09 12:39 PM, ID: 24208707Expert Comment

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[+][-]04/22/09 05:48 PM, ID: 24210964Author Comment

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