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It's not ideal, but you can have them on separated dual(triple, quad) channel. If they are in the same channel it may cause some troubles, system inestability, etc.
So with this CPU it's possible to use them with dual channel and without troubles? ark.intel.com/content/www/us/en/ark/products/88184/… What do I gain if I just buy a brand new single ranked kit or a brand new dual rank kit?
Single ranked matched memory performs slightly better. Dual bank, and quad bank, memory is slightly slower since only one bank can be accessed at any given moment, and there's a minor performance hit in switching banks. Minor.