No damage, motherboard will either run it at 2133mhz by default or you'll manually have to downclock the memory speed from to 2133mhz in bios,leaving everything else untouched.
You can, but keep in mind there is not 100% chance of them to work together. Mostly they work. But i'd save up enough and buy 2 sticks in pair.
i see. the ram that i chose is the cheapest i can get here in the philippines. its hard to find a 2x4gb 2133mhz ram here. will it cause damage to the ram if its not running at 2400mhz?
No damage, motherboard will either run it at 2133mhz by default or you'll manually have to downclock the memory speed from to 2133mhz in bios,leaving everything else untouched.