Plenty of info on the mod
http://bitsandpieces.info/Multipliers.htm
http://www.xlr8yourmac.com/systems/g4_mirrored_drive_doors/G4_MDD_CPU_Module.html
... I also recall a guide on the Macbidoulle/Hardmac site, but can't find it (it was most relevant to the 133 to 166 FSB overclock)
I recently aquired a later model FW800 single 1Ghz machine, 133FSB, and could not get it up to 166FSB - it just reported the former 133 FSB. I suspect the later model boards are fairly different. It also had issue with a PC flashed Geforce 6800 Ultra, which worked fine in other Macs (pins covered etc).
If the 166FSB alteration doesn't work, there is always adjusting the multiplier on the CPU card itself; for a 1.25 DP you should get 1.42 out of it.
JB
http://bitsandpieces.info/Multipliers.htm
http://www.xlr8yourmac.com/systems/g4_mirrored_drive_doors/G4_MDD_CPU_Module.html
... I also recall a guide on the Macbidoulle/Hardmac site, but can't find it (it was most relevant to the 133 to 166 FSB overclock)
I recently aquired a later model FW800 single 1Ghz machine, 133FSB, and could not get it up to 166FSB - it just reported the former 133 FSB. I suspect the later model boards are fairly different. It also had issue with a PC flashed Geforce 6800 Ultra, which worked fine in other Macs (pins covered etc).
If the 166FSB alteration doesn't work, there is always adjusting the multiplier on the CPU card itself; for a 1.25 DP you should get 1.42 out of it.
JB