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Macintosh LC III Overclocking, 25Mhz to:===>33Mhz
Posted by: Crutch on 2022-04-13 19:20:16
Wow good tip. I never knew this.
Posted by: JC8080 on 2023-12-30 13:29:47
Just in case someone runs across this thread and wonders what the performance increase is, here is a Speedometer 3.06 benchmark of the same machine 25mhz vs 33mhz. 20mb RAM, upgraded VRAM, System 7.1. I added a chart below showing the % increase. As expected, the CPU is about 1/3 faster, almost all the other tests have a smaller improvement.

LC III vs III+.jpg

1703971746684.png
Posted by: theirongiant on 2024-03-28 14:49:24
When the instructions say to "remove" this resistor R14, does that mean to leave the pads empty, or bridge them with a jumper wire?

God, this brings back memories. I remember doing something similar with a Texas Instruments calculator in high school. There was a similar modification you could make to the circuit and it would make the calculator run SO much faster. But also eat through the batteries, lol.
Posted by: danny.gonzalez.0861@gmai on 2024-04-01 06:31:01
When the instructions say to "remove" this resistor R14, does that mean to leave the pads empty, or bridge them with a jumper wire?

God, this brings back memories. I remember doing something similar with a Texas Instruments calculator in high school. There was a similar modification you could make to the circuit and it would make the calculator run SO much faster. But also eat through the batteries, lol.
I don't have a LC III but I just overclocked my Performa 630CD and you remove the resistors and replace then in a new location leaving the old pads clear. no need to jumper the old pads.

I red the direction on Low End Mac and the procedure is as follows:

  1. Remove the resistor in position R14 (0 ohm). It is located at the top of the motherboard, near the RAM slot.
  2. Install the resistor you just removed into position R74.
No indication of needing to do anything after removing the resistor from R14, leave the pads as is.

Hope this helps!
Posted by: GameOverman on 2024-05-05 13:20:49
I did the resistor mod it makes a huge improvement in speed of the machine
I also made a custom cooling solution

LC3 overclock and custom cooling

so got bored overclocked my LC3 with the resistor mod. It was getting hot, so I made a custom cooling solution keeps it cool when running benchmarks and whatever else any thoughts? here is a funny little, short I made
68kmla.org 68kmla.org
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