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TWIN2X2048-6400C4 and Asus M2N-E


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I have the 6400C4, which is 4-4-4-12 at 2.1v and I want to use it in the Asus M2N-E, but in the bios the highest vcore allowed is 1.9.


So can I run my 6400C4 run at 5-5-5-12 at 1.9v then? Or does this memory need to be at 2.1v no matter what timings.



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  • 3 weeks later...

I'm in the same path as you.


I bought the TWIN2X2048-6400C4 based on the recommendation of the corsair memory configurator for the M2N-E motherboard.

If you look at the memory performance guides on the right, they have

tested M2N-E BIOS rev 102 with TWIN2X2048-6400C4 @ 4-4-4-12-2T @ V1.9




The highest voltage for the motherboard VDIMM/DRAM voltage is 1.95 for BIOS rev 0802


The sticks of memory run at V2.1 (as printed on their casing), these must be

revised editions. Note the following: 4-4-4-12 @ 2.1V.




Using memtest+ V1.70 running a 4-4-4-12-2T @ V1.95 (highest V).. it

throws pages of errors. If i reset the motherboard memory settings to auto,

memory shows up at 5-5-5-18.


Looking at the TWIN2X2048-6400 (Note NO C4), it appears ok for



5-5-5-12 @ 1.9V, which is what my motherboard supports.


If you search for memory by motherboard search for the M2N-E, you are

informed TWIN2X2048-6400C4 @ 4-4-4-12 is ok... which isn't the case.


If you search the memory by model/code number (not mobo), TWIN2X2048-6400

is listed for ASUS M2N-E and TWIN2X2048-6400C4 doesn't list it.

This is a Contradiction and i'm out of pocket because of it, i can return

the RAM as it was only purchased within the last few days, however, i

need to downgrade to TWIN2X2048-6400, and it's going to cost me to

ship back to the supplier and order a new set plus postage and then wait

for a refund on the TWIN2X2048-6400C4 set. So i'm going to be out of

pocket for 2 lots of shipping, which isn't cheap and i'm not happy about.

There is also a difference in price betweem the 2 sets.


I need to verify that TWIN2X2048-6400 will run @ 1.9V @ 5-5-5-12 and

hasn't been upped to V2.1 which is no good for our motherboard before

ordering the new set.

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  • Corsair Employees

XMS6400, & XMS640C4 are both tested at 1.9 Volts, but max Voltage is 2.1 Volts. If you have a problem test the modules one at a time at the max Voltage your MB will allow (1.95 Volts) and let's make sure one is not failing.

The point is not that you have to run at 2.1 Volts its that with some chipsets and in sme configuration you might have to set the voltage higher then what we test, this is normal.


No two systems will act the same!


XMS6400C4D are tested at 2.1 Volts!

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