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Questions about buying new DDR3 for AMD Phenom X6 - Page 2

post #11 of 13

Sandy Bridge (and Ivy Bridge, for that matter) on LGA1155 do not support tri-channel memory. The only platforms that support tri-channel are LGA1366 (Nehalem i7, long outdated) and LGA2011 (it's actually quad-channel, but I think it can do tri-channel).

 

Full dual channel runs with 2 or 4 DIMMs only. with 3 DIMMs you may be able to get an interleaved dual channel system, but it would be useless to spend on 3 DIMMs seeing as if those are 3x2GB then 2x4GB will probably cost the same or less than $5 more, and if those are 3x4GB then the extra 4GB above 8GB probably won't be useful for you anyway.


Edited by xd_1771 - 2/15/13 at 9:44am
post #12 of 13
Thread Starter 
thank you so much xd_1771, now its clear hehe, Ill definitively go for the 2x4GB or 2x8GB smile.gif
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My computer
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CPUMotherboardGraphicsRAM
AMD Phenom II X6 1090T BlackEd @3900Mhz - 1,4500V Gigabyte GA890XA rev1.0, 8+2splitPW, BIOS F5 Zotac N570 AMPII OC Crucial Ballistix Tracer 1,5V - 2x8GB DDR3 1600... 
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post #13 of 13
Quote:
Originally Posted by Atomfix View Post

Incorrect, you cannot set individual Speed and Timings for each individual slot for the mixed RAM.

Running mixed RAM in a system increases instability by a large margin. And if mixed RAM are in the Dual Channel slots, the system will run in Single Channel..

No one mentioned running individual frequency and timings for each individual slot...

OP asked whether the system would recognize 3 modules in dual channel. The answer is YES. If a single set of frequency and timings can be stable for 3 modules, then YES the system would run as dual channel. If the 3 modules can not be fully stable with ANY settings, then the system would not work stable at all with 3 modules.

If other words, for "mixed RAM" that you speak of, if you have one module that is DDR3-1333 CL9 and one DDR3-1600 CL9, if they can work at DDR3-1333 CL9, they WILL run as dual channel in the system. If they can not be stable at any setting, then the modules are just incompatible and you can not run them in the system.

xtrm, if 12GB is enough for you, and you don't plan to upgrade, 12GB is fine. If you may upgrade or need more than 12GB in the future, then get 8GB or 16GB now. Hope that helps your decision.

Cheers
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