There is Corsair Dominator Platinum DDR3 16GB 2400MHz RAM (2x 8GB) for sale in the members market but according to the MSI website my motherboard only supports up to 2133MHz - will this run at 2133MHz (so, underclocked) or am I better off getting more specific RAM for my board??
Hey Stevie
Glad to read your system is still stable.
Yes, your board can support up to 2133MHz - these sticks may require a bit of extra voltage - 1.55V typically being the accepted rule when clocking Sandybridge - but i know builds that have been ruining at 1.65V and are still running.
The sticks you listed will underclock to 2133MHz, 1866MHz or even 1600MHz and at £100 is they seem a solid buy as they're still cheaper than off the shelf 1600 kits plus they give you options.
Hopefully, you could have a clocked 2500K with 16GB of 2133MHz memory running along side (maybe difficult with a p67a) - and the accepted mantra used to be that there wasn't any discernible difference qith anything higher than 1600. But users are noticing significant gains when coupled with a top end card - such as the GTX 1070. So the rule of thumb has changed somewhat with the addition of new hardware.
Only is some games - either way it wouldn't hurt and it's cheaper than buying new.
Additional: as you will be underclocking the sticks it may be that they wont require the full 1.65V to hit 2133MHz too. So worth experimenting if you do decide to purchase. I would get them stable first at full voltage and then drop to 1.6V for while and then 0.02V increments for speed. Or you could try 1.55V straight off the bat
EDIT: Also check you have the clearance for the memory with your cooler - although you could move them.
