memory timings

Hi,



I have recently purchased 8gb denominator platinum CMD8GX3M2A2133C9

Now I'm thinking I should have got the CMD8GX3M2A2133C8. Is there a noticeable speed difference between the two. I am planning to use it with a z97 chipset motherboard and a core i7 4790k 4ghz. Will i be abe to get 2133 mhz with the core i7 or just 1600

In which case the CMD8GX3M2A21600C7 would be better.