Having this (2x4x0x0), would it then not be running in "dual mode", so not be worth it?
Also, going back to the original idea of buying the exact same 4gb again, could I buy 2 of these giving (4x4x4x0) and leaving one slot free for now? Or should I just use multiples of two (either 4x4x0x0 or 4x4x4x4)?
it will run just fine, even if they dont have the same frequency dont worry.
size doesnt matter at all....
frequency and latency matters while matching memories
and here is the point;
if your motherboard is actually compatible with both memories;
but they are different than each other;
motherboard will match both memories to work on whichever memory is slower. so it will drop the frequency or latency of the faster ram to the slower one.
the thing in here is that your faster memory will be actually but in your case there is no problem.
just makes sure that both memories are marked to work on same frequency / latency / voltage
Thanks guys, most helpful. I've only just seen they're different voltages, I would have missed that
I think what I will do (to be on the safe side) is just buy 3 more of my original 4gb sticks, one by one. I'll probably get one each month until I have 4x4x4x4, then I'll be running 2 lots of 2x4gb in dual mode presumably? Would this be the 'most efficient' way to go?