Depends on a lot of factors, but generally yes ddr you can mix, some brands will mix and some will not...try to make them the same brand.. It's RAMBUS that have to be applied in pairs
I recently encountered a problem mixing brands of DDR - by adding the new stick the computer would not boot. Removed it the computer would. Put the new stick into a different machine it was fine. Ram was same speed - I dont really understand why this would happen, unless its some sort of proprietory thing like compaq ram
got a new mother board (updated) and it worked fine
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