There is no production Core i7-865K processor. Are you sure you that the processor number is correct? If it's a quad-core Core i7 CPU running at 2.93 GHz with unlocked core multiplier then it's a Core i7-875K.
I came accoss a reference to the 865k in a review. It is supposed to be an unlocked 860. And it's supposed to be cheaper than the 860 in order to compete performance+price wise with the 1055T. In that role it isn't surprising that it's barely homologated and perhaps impossible to actually obtain. Or perhaps it's a combination of typos in both price and part number. Another possiblity is that it's confusion between the i5-650 and i5-655k. Unfortunately I can't seem to find the link to the orginal review.
The i7 860 overall is faster then the X6 1090T and the i7 870 has now matched the price of the i7 860 now so that looks a good buy.
Don't get the i5-650 or i5-655k they are Dual Core with Integrated Graphics the i5 750 or new i5 760 which is cheaper and faster are a better buy.