2500k & 1866 memory, will I have problems?

Just noticed on amazon that the Crucial Ballistix Smart Tracer 8gb 1866 are selling for £24.49. probably be cancelled as it looks like the price of just 4gb. Any how, will it run with memory at 1866? I have already ordered but do I need to cancel? I have the vengeance 1600 already but would like to have lower profile ram, plus I like led's.
http://www.amazon.co.uk/Crucial-BLT4...917155&sr=8-11

Cancel it.

I don't want more people dragging attention to the deal and ending up having my order refunded.

Out of stock :( I would have liked to place an order.