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can i use 400mhz ddr 3000+ memory with a 333mhz fsb 2800+

Posted on 2003-11-25
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Last Modified: 2010-04-26
can i use 400 mhz ddr memory by say kingston on a supported board of 400mhz but running 333mhz 2800+ amd XP cpu ... board is a A7N8X Deluxe ...
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Question by:darkage1978
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AlbertaBeef earned 50 total points
ID: 9823023
first, a correction:  400MHz is PC3200.  And yes, you can put 400MHz PC3200 DDR SDRAM into your board with your 333MHz 2800+ cpu.

You will need to match the timings though -  Make sure in your bios the memory is set to run at the speed of the CPU - meaning both at 333MHz.

The advantage to this is if you choose to upgrade to a 400MHz cpu down the road, or something else similarly fast that requires 400MHz RAM, you've already got it and don't have to upgrade RAM also.

But rest assured, your 400MHz PC3200 will run fine in your system, just make sure it's clocked down to the same FSB as the cpu.
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by:cisi
ID: 9823042
Yes, you can use DDR 400Mhz memory on Asus A7N8X. You should set FSB to 166Mhz and then set memory frequency to 120% (400Mhz DDR in your case). If you have a good memory you could go up to 150% (500Mhz DDR).
Anyway for best performance I suggest using 2 memory modules (for dual bus memory configuration) and set memory frequency to "Sync".
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by:AlbertaBeef
ID: 9823085
>>You should set FSB to 166Mhz and then set memory frequency to 120% (400Mhz DDR in your case).

No, you should NOT do this.  This is BAD advice.

First, it is well-documented that the nForce2 and nForce2 Ultra400 chipsets perform best when memory is synchronous to the cpu FSB.  Even if you have FASTER ram than your cpu's fsb speed, trying to run it faster then the cpu bus actually slows the system down.  Any benchmark will prove this.

Secondly, many people who attempt to do this, or to overclock their RAM as cisi is suggesting (500MHz out of PC3200??) experience instabilities in system operation:  sporadic lockups, reboots etc.
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