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Increasing my ram - do all sticks need to be the same size for triple channel?

post #1 of 3
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Dual xeon rig - right now 12 gigs of ram - want to upgrade the amount of ram. Can i just add a couple of sticks of say 8 gig so that i have 8gig x 2 = 16 gigs + 2gig x 4 = 8 so 24 total. Would i have still have triple channel in this config?
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Kneel before Zod
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post #2 of 3
i dont think so since i believe you need 3, 6 etc of matching size sticks for triple channel. i am pretty sure this applies to dual CPU configs and their banks of DIMM's. Anyway's performance you lose wont be much i doubt.
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Going to be chaep
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Wife's Rig
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post #3 of 3
Based on this Intel sourced info linked below, it states that you can run dual channel when you configure the ram on a four-dimm machine similarly to what you are thinking about doing on your six-dimm motherboard. It seems very plausible to me that if you followed the same method, but instead populate 4 out of the 6 slots that you might get tri-channel.

If it doesn't work then you could populate the slots in such a way as to utilize them in dual-channel (24GB) with very little performance loss when compared to tri-channel.

Lastly, there is the "flex-mode" option (read last part of the linked page). You would at least get the additional ram that you're looking for and run all 5 modules (28GB)

http://www.intel.com/support/motherboards/desktop/sb/CS-011965.htm

I keep meaning to test these various alternatives but just forget to do it when I pull out my X58 rig. Gotta write myself a big note, I guess.
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