Can I underclock this 486-100 by dropping internal speed from 3 to 2.5/2? \ VOGONS

Can I underclock this 486-100 by dropping internal speed from 3 to 2.5/2?

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First post, by bluejeans

Posted on 2017-05-04, 19:11

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Haven't dealt with internal speeds before, just bus speed. Board originally came with a dx33 set to 2x internal speed.

Reply 1 of 5, by elod

Posted on 2017-05-04, 19:15

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The internal multiplier is just that: internal. You have no influence over it. Except when it's meant to be changed by software. Not on the 486.

Reply 2 of 5, by sunaiac

Posted on 2017-05-04, 21:00

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Some dx4 are 2x compliant (2x50 is an official dx4-100 speed I would guess)
I don't know of any 2.5 compatible 486.

What is the exact model of your processor ? (sspec if intel would allow to check on cpu-world)

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Reply 3 of 5, by PhilsComputerLab

Posted on 2017-05-04, 21:58

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Yes it depends on the CPU mode. I did this with an AMD DX4 100 back in the old days. Had switches put into the case to let me control the multiplier and FSB, which let me run the machine from 50 MHz to 120 MHz 😀

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Reply 4 of 5, by Ampera

Posted on 2017-05-05, 01:57

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I see no reason you shouldn't underclock your CPU. It's more of a question of can you. The short answer is if there is no jumper and there is no BIOS option, there is no way to do this.

Reply 5 of 5, by bluejeans

Posted on 2017-05-06, 02:22

bluejeans Offline

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sunaiac wrote:
Some dx4 are 2x compliant (2x50 is an official dx4-100 speed I would guess)
I don't know of any 2.5 compatible 486.

What is the exact model of your processor ? (sspec if intel would allow to check on cpu-world)

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