jessenator
Well-known member
I'm wondering if PowerPC CPUs can be overlocked in the more modern/traditional sense of being clocked beyond the given chip's rated/indicated frequency with a sacrifice of increase voltage/wattage and need for more robust cooling solutions. Case in point, the 603e(v?)* onboard the Starmax 5000 motherboard. Reading the p/n on the CPU itself, XPC603PRX240LD, I'm led to CPU-World's page which indicates the rated frequency of 240 MHz: http://www.cpu-world.com/CPUs/PowerPC-603/Motorola-XPC603PRX240LD - XPC603PRX240LE.html
This is related to a long (mostly)monologue post of mine here (which should've been in Hacks/Development to begin with):
Now, I can reasonably hypothesize that this should work, because another curious individual overclocked their 4400/160 first to 200 MHz, then to 250 MHz with a bus speed bump: https://museo.freaknet.org/gallery/apple/stuff/mac/andreas.kann/44002.html which is 125% of the CPU's rating (at least per my own 4400/200 board: XPC603PRX200LD).
But I'm wondering if anyone has any hard-line, "no, this CPU won't go beyond its indicated amount, it will just crash" kind of statement to this point. I mean, I could just try it and maybe there wouldn't be any adverse effects from doing so, but I'd rather save a motherboard and disassembly time by asking and getting an answer from someone who knows.
In his log, Andreas notes he put a fan on the heatsink, but the heatsink in my "naturally aspirated" 4400/200 has the anemic-looking, single-piece-of-sheet-metal, token heatsink, whereas the Starmax has an omni-fin aluminum design. Was the 4400/160 sold overseas different I wonder? Would I need to give it some additional cooling augmentation if OC'ing by 60 MHz (25%) if that's possible?
*SonnetTech's Metronome displays the CPU as a 603ev
edit: yes, some machines don't have easy methods for accomplishing an "overclock," but with the Tanzania motherboards, there's a relatively simple method of swapping around resistors on the 'CPU OPTION' portion of the board to alter the multiplier. I'm more focused on whether or not you can push a CPU's clock beyond its rating, not the method used to get there.
This is related to a long (mostly)monologue post of mine here (which should've been in Hacks/Development to begin with):
Now, I can reasonably hypothesize that this should work, because another curious individual overclocked their 4400/160 first to 200 MHz, then to 250 MHz with a bus speed bump: https://museo.freaknet.org/gallery/apple/stuff/mac/andreas.kann/44002.html which is 125% of the CPU's rating (at least per my own 4400/200 board: XPC603PRX200LD).
But I'm wondering if anyone has any hard-line, "no, this CPU won't go beyond its indicated amount, it will just crash" kind of statement to this point. I mean, I could just try it and maybe there wouldn't be any adverse effects from doing so, but I'd rather save a motherboard and disassembly time by asking and getting an answer from someone who knows.
In his log, Andreas notes he put a fan on the heatsink, but the heatsink in my "naturally aspirated" 4400/200 has the anemic-looking, single-piece-of-sheet-metal, token heatsink, whereas the Starmax has an omni-fin aluminum design. Was the 4400/160 sold overseas different I wonder? Would I need to give it some additional cooling augmentation if OC'ing by 60 MHz (25%) if that's possible?
*SonnetTech's Metronome displays the CPU as a 603ev
edit: yes, some machines don't have easy methods for accomplishing an "overclock," but with the Tanzania motherboards, there's a relatively simple method of swapping around resistors on the 'CPU OPTION' portion of the board to alter the multiplier. I'm more focused on whether or not you can push a CPU's clock beyond its rating, not the method used to get there.
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