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How Do I Change From Single Channel to Dual Channel?

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January 22, 2009 11:38:29 PM

When I checked CPU-Z I noticed my RAM says single channel and that it is only at 400 MHz instead of 533. How do I make it dual channel and how do I bump up the freq (I assume OC)?

Mobo - ASUS M3N72-D AM2+/AM2 NVIDIA nForce 750a SLI
CPU - AMD Phenom 9600 Quad Core
RAM - OCZ Reaper HPC 4GB (2 x 2GB) DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit

I am running Win XP Pro SP3.

Thanks, Darth
a b } Memory
January 23, 2009 12:50:06 AM

First, check in your motherboard manual and confirm that you have the ram in the correct slots. Sometimes you alternate, sometimes you don't. I believe it should then auto dual channel. However, there are options for ganged and unganged. Ganged is a single 128 bit channel while unganged is dual 64 bit channels. My board forces unganged, but I think CPU-Z should correctly identify ganged vs. single channel.

As for the second part, see if there is a setting in the BIOS to set speed and voltage by EPP. if not, you will have to go in and manually set the timings, voltage, and speed of the ram. Look online to see which settings to change and then follow your motherboard manual on how to change them.

Have fun.
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January 23, 2009 3:44:34 AM

Hey thanks for the reply. My RAM was configured under the A2/B2, so I turned ganged on. That didnt work so I switched the RAM modules to the A1/B1 config. That didnt work either under ganged or unganged. CPU-Z says single channel, is there a chance CPU-Z is just reading something wrong?
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a b } Memory
January 23, 2009 10:29:41 AM

It is possible. Try some other programs maybe. Also, when my computer first turns on, the first screen does a RAM check. At that point it says dual or single and 64 or 128 bit (your board may have an optional logo instead).
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January 25, 2009 1:12:50 AM

I think you have to have your ram in A1/A2 for dual channel. A or B is the channel and 1 or 2 is the slot.
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a b } Memory
January 25, 2009 2:49:22 AM

I'm not sure for that particular board, but I have seen it both ways. My Asus NForce 4 SLI was Ram/Empty/Ram/Empty for dual and my recent Gigabyte boards have been Ram/Ram/Empty/Empty for dual. It may be up to the board manufacturer, but your manual should specify.
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January 25, 2009 4:29:28 AM

I don't know ASUS boards, but in your BIOS, can you turn off Quick Boot and Boot Logo?

On my MSI board, it will show a detailed POST view, including whether or not the RAM is in single or dual channel mode.
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January 25, 2009 9:33:08 PM

Hey thanks for the replies everyone. I went ahead and put the modules in the A1/A2 config (dont know how that one slipped me) and that made it dual channel.
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