Fingers,
A 650 can make it over 1GHz, just like some 700s, 750s, 800s, ect. do. They are all made with the same core. The major factor that keeps a lot of people with 650 cB0s from getting over 1GHz is the memory and bus speeds. I have 128MB of double sided HSDRAM in an MSI i815E Pro motherboard, so thats why I'm able to boot with a FSB/Memory speed as high as 166MHz.
I like the 650 cB0 more than the other chips. I get the added bonus of having a higher memory and bus clock speed.
Edit: Oh yeah, I forgot... I bought the CPU about two or three weeks ago.