Snial
Well-known member
It’s safe to try, but do you know the resistor values for 133MHz operation?
I am planning to overclock crystal
You might be the first person to attempt an overclock on the humble 117MHz module, ha.
I'm sure I won't be the last! PowerBook 1400/117MHz modules are fairly plentiful, because so many people have upgraded them to 133MHz, 166MHz or G3 CPUs. I figure that if th chip itself can handle the higher clock speed (i.e. rated at 117MHz, because they didn't test for 133MHz), then it should still run cooler than a 133MHz module with an L2 cache.
OK, so it'd probably only be a 7% to 10% improvement, but hey, the equivalent of 125MHz or 128MHz would still be a good thing!
Overclock PowerBook 1400/117MHz to Cacheless 133MHz?
I have a PB1400/117MHz module. From what I gather, there was never a specific bin for 117MHz, nor 120MHz, only 100MHz and 133MHz. I went to the PowerPC 603e specifications document from Motorola/Freescale/NXP (https://www.nxp.com/docs/en/data-sheet/MPC603EEC.pdf). On page 24, the PLL_CFG is...
68kmla.org
It might boost the overall performance of the 1400 to:
PowerBook 1400/117 | 124 | 143 | 92 | 118 |
(7% boost) | 133 | 153 | 98 | 126 |
(10% boost) | 136 | 157 | 101 | 129 |
Then the CPU would beat a Performa 6320/120; the FPU would beat a PowerMac 8100/80 my SD based drive would finally get above performance of a PowerMac 6100.
Happy days ;-) !