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12GB (2x4GB + 2x2GB) in dual channel - ASUS P8P67-M

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June 2, 2011 10:06:33 PM

I'm building a new gaming desktop.It has been long since I built my own desktop - at least 10 yrs or so. So i'm not familiar with all this dual channel stuff that well.

I've decided to go with these core components:

Intel Core i7 2600
12GB (2x4GB + 2x2GB) DDR3 1600 RAM (All Gskill 1.5V CAS 9 latency modules) - will be buying as two dual channel kits
ASUS P8P67-M

I've almost finalized on my config, but then I realized I might have issues with the dual channel setup.

As far as I've understood the dual channel setup - each of the channels should have the same density of memory and should be of identical timings.

The P8P67-M mobo has 4 DIMM slots

CH-A-1
CH-A-2
CH-B-1
CH-B-2

So if I populate Channel A totally with 6GB and Channel B with 6GB with all the DIMMs of same timings I should get my setup running in dual channel - is that right ?

i.e. 4,2,4,2 in the same order shown above.

Thanks.

PS: The RAM modules I'm purchasing are:
G.SKILL Ripjaws X Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBXL - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL - http://www.newegg.com/Product/Product.aspx?Item=N82E168...
June 2, 2011 10:07:48 PM

even if this did work instead of causing a HUGE HEADACHE, WHY! just use 8 gigs, its more than enough
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June 2, 2011 10:10:59 PM

I would be using this machine as a host for 3 to 4 VMs that I could connect and use from my laptop.

So 12GB of RAM would definitely help me a lot here. Another option if not is for me to spend an extra 50-60 bucks to get 16GB RAM as 4x4GB - I'm already a little over my budget, that is why considering this option.

I understand this is an uncommon setup but just trying to know would it work out.
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Best solution

June 2, 2011 10:15:16 PM

you are going to want to set it up at the 4,2,4,2

Slot 0 | Slot 1 | Slot 2 | Slot 3
4 2 4 2

This will ensure that you stay within dual channel mode and giving you the most of your memory.

Christian Wood
Intel Enthusiast Team
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June 2, 2011 10:24:22 PM

i think your gonna end up like i did one time i bought 4GB or memory one time and wanted so i bought the same identicial kit and cause my display not to work. i be easier to buy 16GB KIT since it dual channel and not triple most mother board mean they must be the same size. eg 4x4GB or 2x4GB or 4X2GB
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June 3, 2011 12:59:00 AM

brpeden82 said:
i think your gonna end up like i did one time i bought 4GB or memory one time and wanted so i bought the same identicial kit and cause my display not to work. i be easier to buy 16GB KIT since it dual channel and not triple most mother board mean they must be the same size. eg 4x4GB or 2x4GB or 4X2GB


He's not buying any triple channel sets, only 2 dual channel sets. As long as they have the same latencies/timings (as the OP noted), and the same size sticks are in the same channel (as noted by Mr. Wood there), it should be fine.

I used a 3x2GB Patriot kit and a 3x1GB Kingston kit with my previous X58 setup and there were no issues.
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June 3, 2011 1:37:06 AM

Thanks guys - I think that clarifies most of the concerns I had.... I'll go ahead and order these components and I have high hope (at least now :)  ) that it should work...

I verified on the Gskill website that both these modules are verified to work with this exact ASUS P67 mobo....

So the worst that could happen is I'll end up returning 2x2GB DIMM modules if they dont cooperate with the 2x4GB modules, still I feel it is worth taking a shot :) 
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June 6, 2011 5:45:10 AM

Best answer selected by tuxdude.
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June 28, 2011 12:40:48 AM

Just to let you guys know - the build work without any issues. :) 

I had one minor problem with memtest which was fixed by a small setting change in the P8P67 bios. Set the memory profile to XMP instead of Auto which was causing memtest to fail.
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