we can assume it's 'b1010 and 4x
R1 moving to R2 and R4 bridging with solder
I believe you are mistaken about what the 1s and 0s represent. Sorry if I misunderstood you or am incorrect in this conclusion, still working this out, and my ability to understand what people are trying to say is often lacking.
I believe a 1 indicates no jumper, and a 0 indicates a yes jumper (solder bridge). If you follow the link in my sig, you will see I ran into this before when reading PowerPC datasheets, and it threw me off way back in 2005. If anyone has found something contradictory to be true, please do share.
I also think on this PowerComputing card, the order is reversed.
So:
R1 = CFG3
R2 = CFG2
R3 = CFG1
R4 = CFG0
I replaced the 60MHz oscillator with a 50MHz one. With the stock resistor configuration, my 7300 booted at 200MHz on a 50MHz bus (4X). For the following examples, lets assume an "X" means bridged, and a "-" means no bridge
First I tried
R1 X
R2 X
R3 X
R4 -
Booted at 150MHz (3X)
I then accidentally tried:
R1 -
R2 X
R3 -
R4 -
black screen (I believe this is 300MHz, 6X)
I then tried what I meant to:
R1 -
R2 -
R3 X
R4 -
250MHz (5X)
Pretty happy with this. Might try for 264MHz and 275MHz.