Subject: Re: Advice wanted from Sun users please (fwd)
To: None <current-users@NetBSD.ORG>
From: Jeff Thieleke <email@example.com>
Date: 03/30/1996 01:57:16
> > There is a reason that he may succeed where you failed. The
> > motorola chip have much, much higher tolerances for this type of
> > hackery. If you're lucky and have a big heatsink, you can find
> > motorola chips that can be overclocked 50% or more. With intel chips,
> > I've rarely heard of clock increases of more that 10-15% being
> > successful.
> Don't overclock a 68030.
Don't overclock any CPU, unless you think the benefits will outweigh the
potential chance of chip damage/malfunction. But there is nothing unique
about overclocking a '030, though.
> When the 25MHz 68030 chips came out on accelerator cards for the Amiga,
> some companies wanted to come out with a 28Mhz version. Just to be
> 3mhz faster, you know. This looks neat on paper.
I am almost certain you meant the 68040. I know GVP had an overclocked
28MHz 040 accelerator, but I don't remember any overclocked 030 cards.
> The problem is, if you overclock that chip by the 3mhz, the math starts
> to go. You get strange low level math errors.
This definitely isn't true. I had a 40MHz 030 overclocked at 50MHz for
over a year, with no problems. However my 40MHz 68882 FPU was flaky at
anything above around 45MHz, so maybe you are thinking of this instead.