> After reading about somenoe saying they are running their Intel DX2/66 at
> 80 mhz, I decided to give it a try with my AMD 66... I changed around the
> jumpers on the motherboard and my system said 75Mhz CPU on the bootup
> screen!!! I was elated! I HAD to see if this was really more performance
> or just a bull*inflated Mhz rating...
> I compiled my linux kernel at 66 mhz... Took 124 seconds... After my "modification" it compiled in only 97 secnds!!!! wowow!!!
> Is this like puniching holes in DD disks to make them HD only to have them
> lose all their data in a few weeks? What is the downside to ru nning my
> CPU a little too fast?? Or am i just getting FREE extra performance???
This is hard to say, since even experts are argueing on it...
- overclocking may overheat your cpu causing a BIG loss of cpu lifetime.
+ Modern 486/66 reach only 55C surface temp, allowed are 85C, so you have
- even if the surface has only 85C, there may be local 'hot spots' inside
the cpu which will cause it to break only at a few points.
+ Modern cpus won't build hot spots.
- (who knows?)
+ Who bothers reducing the lifetime from 200 years to 10 years? Who would
be interested in a 486 after 10 years anyway?
- The processor may malfunction if overclocked, and you will spend hours
on searching for the bug in your software...
- The FPU mostly is more critical than the main cpu, do you really like
- Usually the cpu's are built, and then tested: The good ones get
the 66MHz mark, the bad ones only 40Mhz and so on...
So if you overclock, you may be out of luck.
+ Lots of people have done it and are lucky...
So decide for yourself if you like to do it or not...
* BE SURE to have an active heatsink on your cpu, it should have a small fan
on it. Maybe you should check the CPU temperature after doing some heavy
calculations, integer and with the FPU.
* Some people say using a peltier heatsink is ridiculous, cause it cools the
cpu case too much, causing a too big temperature difference between inside
and outside which may break your chip into pieces.
* REALLY: BE SURE TO COOL YOUR CPU PROPERLY!!! The maximum is 85C
IF you have access to german computer magazines, consider buying c't 8/94
which has an article about cpu overclocking.
Ok, try it if you like, BUt DON'T BLAME ON ME IF YOUR SYSTEM BREAKS, I GIVE
NO WARRANTY FOR THE TIPS ABOVE. (Read the usual GNU disclaimer :)
Hope it helps,
| Olav "Mac" Woelfelschneider |
| I refuse to grow up, |
| I don't want to lose my humor... |