Clock speed (Single MIPS processor)

How high clock speed can my Key3 run on?

I got 1000.0 MHz, but my buddy got 50.44 MHz.

What can the problem be?

Clock Name Type Period Frequency Rise Fall Duty Cycle Divide by Multiply by Phase Offset Edge List Edge Shift Inverted Master Source Targets

CLOCK_50 Base 1.000 1000.0 MHz 0.000 0.500 { CLOCK_50 }

KEY[3] Base 1.000 1000.0 MHz 0.000 0.500 { KEY[3] }