The specs here indicate that the 7700 is the highest compatible CPU not the 7700K. Also being a business class system the ability to OC is not available. This forum post has more information about OC.
Hello my computer 7050 sff i want upgrade CPU, i7 7700k is starting system? It makes sense between i7 7700 vs i7 7700k?There will be a performance gain overclocking is possible 7700k? Memory slot 1-3, 2-4 dual? 1-3 ddr4 two 8gb, 2-4  two 4bg ? Dual mode, not information for manual         
7050 sff CPU upgrade