Hi. I know this seems quite unreasonable but I want to overclock an old 486 DX 66 Mhz PC to be aboe to run some software on it. I don't know whether this is possible or not. It's a pakcard bell PC. I will be glad if this thing can be done. Thanks Joseph

I suppose anything is possible, but why? In the UK a P2 base unit can be sourced for a tenner! http://cgi.ebay.co.uk/Desktop-P2-333-128MB-4-3GB-Cd-rom-Just-9-99_W0QQitemZ8716190395QQcategoryZ3745QQrdZ1QQcmdZViewItem

On those old things all settings are done with jumpers. First of check the manual if there are such jumpers for FSB, multiplier and maybe VCore (cpu voltage). The problem is that those firms like packard bell often used oem boards that had all those jumpers removed so you wouldn't be able to change the settings. If you have those jumpers check which settings are possible. If it allows a higher FSB try it. You can also play around with the multiplier if possible. Just try to do it in as small steps as possible because taking too much can damage the cpu. If the system runs unstable at the higher speed a small raise of the Vcore may help but be careful there. And always keep an eye on the cpu temperature.

Yes it's possible. The 486 66MHz is 2 x 33 MHz, you may be able to make the multipler from 2 to 3 (jumpers on the motherboard) but this would make your PC VERY unstable have a look at the jumpers with some values near them. what's the highest multipler ? 3 ? 4? how about the highest BUSS speed ? there should be 25, 33 ... can you see 50 ? 60 ? now multiply the highest of two numbers I think you should be able to run a DX2 120 mhz (2 x 60) or DX2 100 Mhz (2 x 50), I don't remember if there was a 2 x 66 = 133 mhz. I upgraded my old mitac dx2 66 laptop to dx4 100, you can buy a dx4 cpu in almost any antiques shop now :) hope that helps computing.net rocks

lol yes its all done with jumpers i would go for 3 x 33 if you have them would not take it further unless you have a bigger heat sink Get Firefox

If it's a Packard Bell, you're lucky it's running at all. Don't tempt fate with that old dog! You can avoid many of these Windows problems with Linux. Linspire eases the transition for new users