As title says are these compatible with an asus z87-k right now i have 2 4gb sticks and one 1 gb stick installed. 4 slots total. Mmoment 8GB DDR3 1600MHz UDIMM PC3-12800 1.5V CL11 Non- ECC Unbuffered 240-pin (2Rx8 / Dual Rank Base on 512Mx8) PC Computer Desktop Memory Upgrade Module at Amazon.comother stick. 8GB 2Rx4 PC3-10600R (DDR3-1333) ECC REG SERVER MEMORY | eBay Very much appreciated.