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barney
November 14th, 2009, 06:27 AM
I have a 486 system with an AMD DX2 80 processor. I want to slow the system down a bit to the speed of 486DX2 66. Can this processor safely be throttled back to this speed? Is the clock multiplier change going to be a problem? Thanks.

Barney

Jorg
November 14th, 2009, 06:55 AM
I have a 486 system with an AMD DX2 80 processor. I want to slow the system down a bit to the speed of 486DX2 66. Can this processor safely be throttled back to this speed? Is the clock multiplier change going to be a problem? Thanks.

Barney

The DX2 80 is at 40 mhz bus x 2.
You can easily put it on 33 mhz or 25 mhz bus so you get 66 or 50 Mhz.

I'm running a DX4 -100 on 50 mhz here (2 x 25 Mhz), without fan.

Anonymous Coward
November 14th, 2009, 09:39 AM
It's probably not a bad idea to run at 66MHz. The DX/2-80 ran a bit too hot because it was the fastest 5V 486 made.

It's not possible to change the clock multipliers in 5V DX/2s. Some of the 3.3V DX/2 let you use the 3X multiplier, but this had more to do with the fact that they were really remarked DX/4s.

Jorg
November 14th, 2009, 10:01 AM
Another point speaking for 33 mhz is that it might avoid problems with some VLB cards. I didn't remember that the /80 was 5V- but then I never had one.