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Combi Problem Twin2x2048-6400Pro and Twin 2x2048-6400C4


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I have an Asus P5WDH DeLuxe Mobo and for 2 years Twin2x2048-6400Pro.

For my birthday i've got extra memory (always nice) Twin2x2048-6400C4.

I thought, 15 minutes and my machine runs with 4Gb, big disappointment.

When i installed the new memory in bank 2 and 4 (1 and 3 where filled with the PRO memory) my PC didn't boot at all (bios at std default ratings).

After that at tested by installing just one card extra in bank 2, the pc booted but displayed 2,5GB memory, the other one didn't do anything.

What can i do?


PS excuses for my language (i'm Dutch).

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First please test the module one at a time with the memory Voltage set to 2.0 Volts at Cas 5-5-5-15 and Disable Legacy USB and test with http://www.memtest.org. If they all pass then set the memory frequency DDR667 and set the NB/MCH VOltage to +.05 Volts and then exit saving changes and let it try to boot from a floppy or CD then turn it off and then install all four modules so they are not matched and see if it will post.
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  • 2 weeks later...

At first, thanks for trying.

I returned my memory for a other twin 2x2048-6400C4 set.

(the old set seems to be broken, also in the computershop)

I have now the same problem, although this new set can operate alone,

and my motherboard display's 2048mb.

But I want 4Gb.


Of course i did what you had written, but it didn't help.

If I use all 4 banks, it only displays 2432Mb.

What else can I do?:confused:

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You are mixing and matching DRAM so stability might well be compromised.


Enter your BIOS. Set your DRAM bandwidth to 667Mhz and your DRAM voltage to 2.1V. Raise your Memory Controller Hub Voltage +.02V higher. Then enable the option “Memory Remap Feature” which will remap the memory hole and BIOS should then show 4GB. Of course your 32bit OS will not see the full 4GB because all of your CPU/Motherboard/Legacy/Video/Audio (etc.) devices will need to populate space in that 4GB area.

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