In AMD's testing SYSmark AMD has found that SYSmark provides data that is not comparable to the difference in real world performance when it compared AMD and Intel CPUs, giving a performance delta of 50% for a comparable system when other benchmarks like PCMARK only give a delta of 7%.
SYSmark is often used in advertising material and this isn't the first time AMD has slammed the benchmark. In 2011, AMD left the BAPCo consortium and issued a press release warning consumers not to trust SYSmark 2012. Similarly, NVIDIA and VIA also left the consortium in 2011 because they felt that SYSmark did not accurately represent real-world PC usage scenarios and workloads.
Source: Overclock3D