68k overclock chips

[alex68]

Hello, I would like to know with overclock how many maximum mhz can these chips reach, both LC versions and with fpu 68000,68020,68030,68040,68060? greetings and thanks for listening to me

[Karlos]

Obvious things first, if you intend to overclock, I'd advise against. By far the most overclockable are the later revision 68060 units. People routinely run those at 100MHz without issues.

The fastest stable 68040 I've seen is 50MHz but it required strong active cooling. Thats a 100MHz crystal again.

There's a chap here with a 68030 running at around 70MHz. Ceramic bodied 68020 parts rated for 33MHz are probably clockable to 40MHz with active cooling but I don't know if any examples.

[SkulleateR]

Also be aware that even if you have two identical CPUs they can behave differently to overclocking (different production runs and so on) ...

[alex68]

Thanks for listen.

[alex68]

Originally Posted by Karlos

Obvious things first, if you intend to overclock, I'd advise against. By far the most overclockable are the later revision 68060 units. People routinely run those at 100MHz without issues.

The fastest stable 68040 I've seen is 50MHz but it required strong active cooling. Thats a 100MHz crystal again.

There's a chap here with a 68030 running at around 70MHz. Ceramic bodied 68020 parts rated for 33MHz are probably clockable to 40MHz with active cooling but I don't know if any examples.

I can see 68030 at 70. I would like to see it. Do you have the link? I didn't think 030 could be so high.

[Karlos]

Originally Posted by alex68

I can see 68030 at 70. I would like to see it. Do you have the link? I didn't think 030 could be so high.

It's a guy with a CD32 I think.

[Lunda]

Link to 030 70.9MHz: https://eab.abime.net/showthread.php?t=115241&nojs=1

[alexh]

Just like the L88M 040 and E41J 060 there are later mask revisions of 030 (F91C and G40W) that in certain packages (MC68030RC50) overclock the best.

However today it is all mute. Just buy a Pistorm(16) or better a Pistorm32 lite if you want the fastest CPU available.

[alex68]

From what I have read the 68k series up to the 68060 was very good in fact I love the entire 68k series it is a shame that Motorola finished manufacturing processors in the 68060 rev6 if it had continued it would have kicked Intel's ass I am sure, the 68000 was in everything down to the sound processor and arcade motherboards.

[alexh]

Originally Posted by alex68

it is a shame that Motorola finished manufacturing processors if it had continued it would have kicked Intel's ass I am sure

They did continue to manufacture processors. The PowerPC and the Coldfire.

Neither "kicked Intel's ass".

For a while (until ARM7) Motorola CPUs/SoCs continued to be in "everything". (Telephony, Washing machines & TVs, Routers etc.)

[Thomas Richter]

Originally Posted by alex68

Hello, I would like to know with overclock how many maximum mhz can these chips reach, both LC versions and with fpu 68000,68020,68030,68040,68060? greetings and thanks for listening to me

The 68K chips don't grow on trees, and overclocked chips surely age faster - so the chance to fry them is higher. I wouldn't really do that. If you want a fast Amiga, emulation is certainly the easiest and cheapest option.

[btp]

Originally Posted by alex68

Hello, I would like to know with overclock how many maximum mhz can these chips reach, both LC versions and with fpu 68000,68020,68030,68040,68060? greetings and thanks for listening to me

Hmm it's rather interesting that all of your posts in eab (without exception) are about overclocking Motorola processors. You have received several good answers and opinions throughout the years but you are still asking the same more or less questions every now and then. Why is that? Do you expect that something has changed suddenly a 68K CPU will be able to operate in 100s of MHz?

[Lunda]

Originally Posted by Thomas Richter

The 68K chips don't grow on trees, and overclocked chips surely age faster - so the chance to fry them is higher. I wouldn't really do that. If you want a fast Amiga, emulation is certainly the easiest and cheapest option.

For a well designed system without latch-up issues. Heat is the main concern.
So always undervolt as much as possible and keep your chips cool. Adding heatsinks to the Amiga chips can extend the life of your Amiga by many years.

It's also good to keep your CPU cool, even though it will most likely outlive the rest of your system. And if it dies, there are plenty of spares available compared to the custom Amiga chips.

Emulation is the only safe way, but only if you emulate the whole system.

It seems most people still like to use real Amiga hardware, even though emulation has been the fastest option for about 20 years.