Can I install <typeX memory> with <typeY>?
I read the sticky
The answer is generically "No" and applies to "DDR/SDR", "DDR2/DDR" and "Rambus/Non-Rambus". This rule applies whether you have two different types of memory slots on your motherboard or if you have a different type of memory than the slot. It also applies to mixing ECC/Registered memory with non-ECC/unbuffered memory.
so if I want to install more memery do i need the same timings?
I read the sticky
The answer is generically "No" and applies to "DDR/SDR", "DDR2/DDR" and "Rambus/Non-Rambus". This rule applies whether you have two different types of memory slots on your motherboard or if you have a different type of memory than the slot. It also applies to mixing ECC/Registered memory with non-ECC/unbuffered memory.
so if I want to install more memery do i need the same timings?