If you're not sure about the revision level you can check the stepping code on the original processor box, you can check the stepping code on the cpu IHS heatsink, or easiest yet....... use CPUz to determine all the cool info on your processor.
You can download CPUID/CPUz here;
Here's what mine looks like;
By wevsspot at 2010-08-10
Mine is a D0 revision i7 920