You did have to install Dimms in pairs for older computers which used RDRAMs, but computers nowadys use SDRAMs. So, you can mix combination of RAMs of different sizes and speeds without any problem.
Not necessary.
matched RAM
Assuming you mean in every "empty memory slot/socket."ClarificationThe memory modules/chips/cards are the items installed into the computer, so an "empty memory module" makes no sense.AnswerIf a memory slot is vacant, nothing needs doing, except in some very old PC-class systems, where memory modules were installed in pairs.
30-pin SIMMs
72-pin SIMM
72-pin SIMMs must be installed in groups of two modules to a bank of memory
That depends on the age and class of motherboard. You must use the correct memory modules and the correct number of them. Usually this is in pairs.
SIMM
When installing SIMMs into a Pentium system board you must use SIMMs in pairs in order to fill a memory bank. The Pentium has a data path of 64 bits and as such requires 2 SIMMs each being a 32 bit module to function.
Larger memory modules tend to be slower than smaller memory modules, as larger memory modules may require extra layers of multiplexers to address everything. They are also more expensive, as they must have more circuitry in the same amount of space.
They are installed in groups or banks of two. Most older motherboards that use SIMMs have one to three banks that can be filled with two, four, or six SIMMs. 72-pin simms are installed into groups or banks of two
No. Memory is a part that must be installed inside your computer.
Memory Ram
No, the memory modules must match. You should install two-2 GB ram strips.