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SawyerTHEBEST
May 11, 2013, 06:50 PM
Can you overclock ram speed on PowerPC Mac's?



Lil Chillbil
May 12, 2013, 11:38 AM
No

Intell
May 12, 2013, 05:37 PM
Can you overclock ram speed on PowerPC Mac's?

Yes, but only on the early Macs. PowerPC Macs that use DDR1 ram cannot have their ram overclocked. Only those with PC-66 through PC-133 can have their ram overclocked. Also when overclocking the ram, the CPU's clock speed increases as well unless its multiplier is changed for the new ram speed. Also note, overclocking the ram through OpenFirmware does not work. It only changes what the computer reports the speed as being. To overclock it you must solder resisters on it's board.

rabidz7
May 20, 2013, 02:30 PM
Yes, but only on the early Macs. PowerPC Macs that use DDR1 ram cannot have their ram overclocked. Only those with PC-66 through PC-133 can have their ram overclocked. Also when overclocking the ram, the CPU's clock speed increases as well unless its multiplier is changed for the new ram speed. Also note, overclocking the ram through OpenFirmware does not work. It only changes what the computer reports the speed as being. To overclock it you must solder resisters on it's board.

You can also solder a DIP switch on.
http://www.lowendmac.com/macdan/05/1130.html

Intell
May 20, 2013, 02:33 PM
You can also solder a DIP switch on.
http://www.lowendmac.com/macdan/05/1130.html

That still requires soldering the resistors by hand at least once.

Cox Orange
May 27, 2013, 12:22 PM
I don't get the point in the lowend article.
I wonder, if it's not easier to buy a Sawtooth with 500MHz@100FSB (or the CPU alone) or a Digital Audio one with 533MHz@133 (OK, one RAM-Slot less then).
If he gets theoretically 960MHz, the ratio between is 8 versus 4 (for the 480/120 and 533/133).
He uses Xbench to benchmark, so I don't think that it has anything to say. I would loved him to see doing a real task like copying a file, encoding mp3 or something.
Well, I know, as a proof of concept it is very nice work of him.

666sheep
May 27, 2013, 03:05 PM
http://www.xlr8yourmac.com/g4zone/sawtooth/sawtoothcpudesign.html

This is original mod, done in 2001. Reality was little different back there.
Guy from lowend just made this mod a little easier and took some credits of Michiro Isobe's work ;)