What is the reason for a technician's inability to add eight more 4GB modules of DDR3 unbuffered ECC memory in a server already having 2GB modules?

The correct answer indicates that the server requires fully buffered memory, which is significant because memory types must be compatible within a server. Fully buffered memory (FB-DIMM) differs from unbuffered memory (UDIMM) in terms of how the memory modules handle data; FB-DIMMs can manage larger amounts of memory and often do so more effectively in terms of performance due to their architecture.

In a scenario where a server is designed to work specifically with fully buffered memory modules, attempting to install unbuffered ECC memory—like the 4GB modules in question—would lead to compatibility issues. This is because unbuffered memory lacks the additional buffer that fully buffered memory has, leading to potential instability or failure to recognize the memory.

The other potential reasons do not apply in this case: mixing different sizes of memory modules typically depends more on the motherboard's specifications than on the sizes themselves, and it is possible to use ECC memory in servers designed to support it. Additionally, while servers do have limits on total memory capacity, such as 24GB, this specific limitation is based on the server model and not a general rule that would prevent mixing the memory sizes if both types were compatible. Thus, the requirement for fully buffered memory is why the