its still a great score, i get round about 14050, but something deep down says that you should be getting more!! remember when components heat up in your system, they tend to down clock! especially your GPU and CPu, so question:
what is the temperatures of your rig when running 3D Mark? have you got temp gauges you can rely on like Rivatuner?
you should be getting at least 29000 to even 30 000! do you run the tests at default?
just my thought, but all in all, I wish i had that score!