OK, I'll admit a complete lack of knowledge of memory architecture
so this is probably a dumb question, but...
I presently have an i5 rig built around one of these:
https://www.overclockers.co.uk/msi-z77a-g43-intel-z77-socket-1155-ddr3-motherboard-mb-202-ms.html
Carrying 8GB of this:
https://www.overclockers.co.uk/king...-channel-kit-khx1600c9d3k2-8gx-my-136-ks.html
I'm getting increasingly frequent out of memory errors, particularly with large image catalogues in Lightroom, so I planned to add more RAM. The mobo manual is a bit unhelpful in terms of specifics on maintaining dual channel compatibility but recommends matching density and type for stability.
So, once back in stock, if I stick these:
https://www.overclockers.co.uk/team...annel-kit-tpkd316g1600hc11dc01-my-034-tg.html
...in DIMMs 2 and 4, replacing the old RAM, can I re-deploy the old DIMMs in slots 1 an 3 to stably get 24GB and maintaning dual-channel benefits, or is this a silly idea and I should just ditch the 2x4GB sticks and go with the 16GB?
Thoughts from those with a more extensive understanding than myself welcome....

I presently have an i5 rig built around one of these:
https://www.overclockers.co.uk/msi-z77a-g43-intel-z77-socket-1155-ddr3-motherboard-mb-202-ms.html
Carrying 8GB of this:
https://www.overclockers.co.uk/king...-channel-kit-khx1600c9d3k2-8gx-my-136-ks.html
I'm getting increasingly frequent out of memory errors, particularly with large image catalogues in Lightroom, so I planned to add more RAM. The mobo manual is a bit unhelpful in terms of specifics on maintaining dual channel compatibility but recommends matching density and type for stability.
So, once back in stock, if I stick these:
https://www.overclockers.co.uk/team...annel-kit-tpkd316g1600hc11dc01-my-034-tg.html
...in DIMMs 2 and 4, replacing the old RAM, can I re-deploy the old DIMMs in slots 1 an 3 to stably get 24GB and maintaning dual-channel benefits, or is this a silly idea and I should just ditch the 2x4GB sticks and go with the 16GB?
Thoughts from those with a more extensive understanding than myself welcome....