About the only thing you can go to on this machine is the E8600, 3.33 GHz, LGA 775 (Socket T).
This gives you:
Geekbench 2 (32): 4647 Geekbench 2 (64): 5189
Geekbench 3 (32): 1824 Geekbench 3 (32): 3199
Geekbench 3 (64): 1908 Geekbench 3 (64): 3271
vs
the 3.06 of
Geekbench 2 (32): 4221 Geekbench 2 (64): 4628
Geekbench 3 (32): 1641 Geekbench 3 (32): 2882
Geekbench 3 (64): 1782 Geekbench 3 (64): 3128