Ok, so I found 1x8gb 2400MHZ is C11
And 2X4GB 2400MHZ is C11, but considerably cheaper
2x4GB 1866MHZ is C9, £1 cheaper than the one above
2x4GB 1600MHZ is C9 and same price as one above
I surprisingly found that the second one is the cheapest, I wonder why
I am guessing that the higher the C number the slower it is?
So is it better to get 2X4GB 2400MHZ, 2x4GB 1866MHZ, or 2x4GB 1600MHZ?
In terms of speed and cost