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Question 2133 MHz ram compatible with 2400 MHz ram?? ASUS-Z97

If you must upgrade, look into a ram kit, as opposed to trying to patch the upgrade up with a mixed set of ram sticks. I'd suggest picking up a kit, for now, then after the upgrade, sell the stick of ram you've got from the platform. FYI, if you decide to work with the ram you've linked, you're going to be running all rams at DDR3-2133MHz.

Again, don't mix and match rams during an upgrade. Less troubleshooting.