Overclocking 68882

[Karlos]

What are you intending to run that will benefit from the overclock? It isn't as if the FPU is used unless an application is compiled for it, or uses the maths libraries (for which you can get FPU versions). The latter aren't exactly going to be that fast anyway compared to FPU direct code simply because of the overhead in doing the library call.

[Karlos]

The highest I've seen a 68030 running without issues is ~64MHz. The thing about overclocking is, you are basically going to kill your CPU one day.

Today, people are used to CPU's having a fair degree of headroom in their clock rating and there's always a bigger cooler you can fit. It's also the case people tend to upgrade their processor after just a few years, so they are unlikely to notice any ill effects.

The 68030 isn't from that era. The 68030 was from the era when chips were sold based on their ability to run at the stated speed correctly. You are talking about taking a component that is probably well over a decade old and running it at 32% faster than the speed it is certified to run at. You might get away with it for months or even years, but one day, your system isn't going to start. You might then discover that it still doesn't start when you put it back to the stated speed either.

Considering that spares aren't that easy to come by, is it worth it?

[Karlos]

I agree completely and understand the risks. 66mhz was as high as I was willing to go, will probably settle at 55 or maybe even 60

I understand the desire to squeeze more out of your machine but I would advise against, to be honest. Back in the day, I overclocked my old 68040 from 25 to 30MHz (equivalent to your proposed 50 -> 60 MHz). It didn't make a huge difference in terms of performance to be fair and was less stable.

Now I look at it from the point of view of longevity. I'd much rather have a stable system than a slightly faster one.

If I want raw speed for 68K apps, I use UAE. It's pretty much impossible to beat.