This might be worth looking into to see if theres something out of ordinary in the submission. You can just about see cheat engine on his desktop, not sure if cheat engine can affect 3dm11 scores though.

 

http://hwbot.org/submission/3092006_sandalo_3dmark11___performance_geforce_gtx_980_ti_28083_marks

 

http://i.imgur.com/8Xrzc8p.png

GPU PhysX is on.. so it is not valid i guess.

score looks fine matt, nothing strange for the clocks anyway