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Asus P5N32-E SLI doesn't post - 2 pairs of TWIN2X2048-6400C4


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Recently i bought 2gb extra twin2x6400c4 to install on my p5n32-e sli (680I), so the total amount is 4gb of twin2x6400c4. My problem is that it won't even post the bios. I know this is a familiar problem but i've seem to have tried everything that i could find on the www and this forum and still have the same problem.


I've got installed:

-4x 1gb twin2x6400c4

2x 1gb version 2.1

2x 1gb version 6.2

-asus p5n32-e sli (680I) bios 1503



Here's a summery of my throubleshoot:

-stress test all the dimms seperatly

-relocate dimms in different slots

-n.b. voltage to 1.45

-ram volt from 1.8 to 2.1

-latency from 5-5-5-15 to 7-7-7-21

-mem speed from 500 to 800

-set several advanced timings

-updated bios to latest (1503)

obviously i also mixed settings i any way i could imagine.


I did got 3gb to post to vista but not stable with following setting:

-n.b. 1.45V

-ram 2.1V

-mem speed set @ 666:evildevil but it posted as 800 ?!? :confused: ?!?

-latency 6-6-6-18

-dimms located as follows:

-slot 1 V2.1

-slot 2 empty

-slot 3 V6.2

-slot 4 V2.1

so these were off set version wise, i feel that the off set caused the men speed to post as 800 instead of 666.


Can sombody please help me as i'm absolutely clueless of what to do next!


Many thanx in advance.





Currently i've got vista 32bit installed but this a bios related problem, so please no comments on whether you sould use a 32bit o/s or a 64bit o/s.

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It is advised to drop the bandwidth when populating with four DRAM slots. Please research this thread:




There are two issues here. One is the issue of different DRAM fabricated ICs. The versions are far different and can issue problems with installation in a marriage. Secondly there is an issue with the memory controller and a population of all four banks at the full speed of a two bank run. This issue is across the board with both Nvidia and Intel chipset based boards.


Keep in mind that often issues arise in the longer term. The issues seldom damage the DRAM. They damage the on motherboard memory controller which has a harder time keeping up with the demands of a four DRAM slot population being run as fast as a two DRAM slot population. Those who want to be secure in their system either purchase a single kit of the DRAM capacity that the four singles have or they move to a higher bandwidth DRAM and drop the bandwidth. I also advise it as I have personally seen the issues that can and often do arise with a four DRAM slot population running at the full speed of a single kit speed.


If you intend on running the four sticks at the full speed of a kit, then I would advise you to raise the MCH (Memory Controller Hub / Northbridge) to 1.45v on that motherboard. I would not increase the voltage to the DRAM greater than 2.1v which is the maximum warranted voltage for that DRAM. Since you have tried all the suggestions that could be given already, it is doubtful that you will marry the set. Keep in mind that it is not advised, nor is it supported to populate DRAM slots with different integer versions. In other words, version 1.xxx with 1.xxx, not 1.xxx with 2.xxx.


You can attempt to set the tRFC higher and see if this helps but I personally doubt it.

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