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x79 memory question.

post #1 of 9
Thread Starter 
I see the Sandybridge-E processors are available now and I have a question about the memory configuration. If I were to run 2x8GB and 2x4gb pieces of RAM, would it be able to run in "Quad Channel"?
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post #2 of 9
Not sure to be honest, i would like to say yes in theory. But it's likely to need matched dimms.
 
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post #3 of 9
I'm thinking that it would read as two sets of dual channel rather than quad channel because the density of the RAM is different.
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post #4 of 9
It cannot be entirely in quad channel.

If anything... it might run in a Flex-Quad Channel Mode. It would be quad up to 4GB and then dual for the rest of the 4GB.
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post #5 of 9
Yeah, it should be in flex memory mode.

With 2x8 and 2x4 the first 16GiB would be quad channel and the last 8GiB would be dual.
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post #6 of 9
Quote:
Originally Posted by Blameless View Post

With 2x8 and 2x4 the first 16GiB would be quad channel and the last 8GiB would be dual.
Opps, that's right....

The first 4GB across 4 DIMMs is 16GB. Then the remaining 4GB of the 2 DIMMs is 8GB.
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post #7 of 9
Thread Starter 
Interesting, thanks guys!

BTW - It was supposed to read 2x4gb's and 2x2gb's ... I have 12gb of ram. But I think the same thing would apply, am I right?
Edited by dmreeves - 11/14/11 at 2:08pm
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post #8 of 9
Quote:
Originally Posted by dmreeves View Post

I see the Sandybridge-E processors are available now and I have a question about the memory configuration. If I were to run 2x8GB and 2x4gb pieces of RAM, would it be able to run in "Quad Channel"?

Found an answer for you at this source with the quotation below - http://sinhardware.com/index.php/reviews/motherboards/104-gigabyte/lga2011/84-gigabyte-x79-ud7-review-w-3960x?showall=1&limitstart=
"The IMC is quad channel, but also supports dual and triple channel. So as long as you put more than 1 stick of memory in there, it will optimize the memory channels. You can even mix two different sets of memory and set their timings and voltages independently."
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post #9 of 9
Quote:
Originally Posted by dmreeves View Post

Interesting, thanks guys!
BTW - It was supposed to read 2x4gb's and 2x2gb's ... I have 12gb of ram. But I think the same thing would apply, am I right?

Yes.

The first 8GiB of addresses would be in quad channel, the remaining 4GiB would be in dual.
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