you upgraded the cpu in your 4,1 to the w3580 without upgrading the 5,1 firmware? Forgive me if I am incorrect, but if you flash the firmware to 5,1 you'd probably be getting faster speeds? right
From what I understand, I'll only get faster speeds if my ram is actually 1333MHz. It's not. And even if it were, it's marginal and just about negligible gains (just like using triple channel instead of double channel on my Mac Pro). If, on the other hand, the firmware update increases performance in other ways, I'm all ears.
May I ask why you are using such an old version of Geekbench?
When I tried the update tool in geekbench, it gave no results. I just tried using the newer version, but it requires purchase for 64 bit version. Don't really care enough about geekbench to spend money on it.
In any case, the point is in using the same version for both CPUs...
Loa