Unless the sticks are borderline or your supply is flaky 0.1V isn't going to hurt one way or the other. Put the 2.5V sticks in the lower numbered sockets. Your timing and voltage should auto config for those and let the new RAM run at 2.5V. If it throws errors manually set to 2.6V. There is a chance you'll have issues vs. if they were all equal but it's likely you'll be fine.
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