I want to overclock my powermac 5400/180 to 200 MHz and if that is stable maybe more. I'll add a fan to keep it cool. How do I go about this. Is there a way to increase my 40mhz bus speed to say 66 which would give me a CPU speed of about 300 mhz or could I increase the bus speed to 66 mhz and decrease the multiplyer from 4.5 (what it is now) to 3.5 to make the cpu speed more like 230 mhz? Any ideas

[TimmyDee51]

The only way I know of to OC your bus is to actually go in and remove resistors. This is very touchy because if you get it going too fast, your system will freeze or crash. If this is the case, then you have to go back in a replace the resistors. I have heard of one successful upgrade on a beige G3 from 66 MHz to 83 MHz. He had to remove resistors to do this. Other than that, I haven't heard of anyone doing it. I considered it myself on my rev. D iMac but then gave up due to the complexity and inherent risk in the operation.

[Evangellydonut]

Beige G3 is jumpered, not using regular resistors, making it easy to OC, and almost everyone did such...on the other hand, the iMacs and the G4s are much harder to OC.

Prior to the G3, hardly anyone really paid attention to OCing a Mac, so I doubt you can easily find info on that 5400 machine...

Go to: http://www.bekkoame.ne.jp/~t-imai/pm54e1.html
This shows you what resisters need to be moved and where to put them!
Mr. Corwin