Overclocking a 486 DX4 120MHz chip

[RADAR1797]

I recently recieved a free AMD 486DX4 120MHz chip. Has anyone ever overclocked these bad boys? I have one option to overclock and that is to move it from 3X40MHz=120 to 3X50Mhz=150. Let me know what you think.

-RADAR

[scotter]

you can probably do it but there is one thing to watch and that is the isa cards and or pci as most old systems did not divide the bus speeds past 33mhz it should work though http://www.sysopt.com/forum/smile.gif
good luck and give it a try it's not like your gona kill it and if so just yell there are a lot of us that still have some of those chips lying around http://www.sysopt.com/forum/smile.gif

[Peter M]

Depending on how old that DX4/120 is, it might have a multiplier selection of 3x/4x. Must be a model with 16 KB Writeback cache, if it's 8 KB or Writethrough-only, then it has 3x/2x. (How come? AMD's next offering back then was the DX5/133, and as usual, slower speed grades were made from the same core. This is why there are DX4/100 and DX4/120s that have the DX5 core and 4x multiplier instead of 2x.)

Jumper to 2x as for a DX2, and see what you get. If it has 4x, the fastest setting with non-overclocked peripherals would be 4x33 on a PCI system and 4x40 on a VLB system.

Regards, Peter