silly question about 68060 CPU

[x56h34]

@Karlos:

Thanks for letting me know.

I also forgot to mention that the Phase 5 model is the standard 68060 with FPU and MMU, clocked @ 50Mhz, and the DCE model is a fancy true 60Mhz 68060 clocked at 66Mhz with FPU and MMU, so it's about 16Mhz faster than the Phase 5 model. It is also so cool, that putting a heatsink/fan on it would be a waste of money and time. ;-)

[downix]

@Brian

Ya know they make 80Mhz 060's, right?

[fragment]

downix wrote:
@Brian

Ya know they make 80Mhz 060's, right?

IIRC the MMU and the FPU stop functioning when going over 66MHz..

[Damion]

@Karlos:

Thanks for letting me know.

I also forgot to mention that the Phase 5 model is the standard 68060 with FPU and MMU, clocked @ 50Mhz, and the DCE model is a fancy true 60Mhz 68060 clocked at 66Mhz with FPU and MMU, so it's about 16Mhz faster than the Phase 5 model. It is also so cool, that putting a heatsink/fan on it would be a waste of money and time.

Your 60mhz (68060RC60) '060 runs fine at 66mhz
with no fan or heatsink? That's interesting...mine
came from DCE with an obnoxious fan (since
replaced)...it would be nice to ditch the fan
completely if safe.

[x56h34]

Yep, it's very cool. Try it out without the heatsink/fan and put your finger on the 68060 after lets say 15-30 minutes of use and see what happens. When I do that I can only feel slight heat, and there's no need to remove my finger at any time as there is with the Phase 5 model which would burn my finger if I leave it on the 68060 for more than lets say 10 seconds. It's weird...some 060 chips run cooler than others.

I would think that your DCE Blizzard 1260 was equipped with heatsink/fan by the dealer, just in case! :-)

[Damion]

Ya know they make 80Mhz 060's, right?

Well, there are no "factory" 80mhz chips, but
certain mask revisions are capable of handling
the speed at the cost of longevity.

The later "G65V" mask (MC68060RC50 "A" chips)
are the best canidates for 80mhz, as it seems
the FPU has been slightly modified to reduce
potential errors (as well as MOS11 fab).

Unfortunately, all of the factory 60mhz chips I have
seen (including those with '2002' stamped on them)
are still manufactured with the previous F43G mask
process, and usually crap out at anything above
70mhz.

Motorola makes:

-50 and 60mhz chips with "full" FPU/MMU

-for "embedded" applications, "cut down" 50, 66
and 75mhz chips which lack either FPU, or both
 FPU and MMU.

[Damion]

Yep, it's very cool. Try it out without the heatsink/fan and put your finger on the 68060 after lets say 15-30 minutes of use and see what happens. When I do that I can only feel slight heat, and there's no need to remove my finger at any time as there is with the Phase 5 model which would burn my finger if I leave it on the 68060 for more than lets say 10 seconds. It's weird...some 060 chips run cooler than others.

I would think that your DCE Blizzard 1260 was equipped with heatsink/fan by the dealer, just in case!

Thanks for the info, I'll try it out -carefully- and see
what happens.

[Brian]

I got a DCE Blizzard 1260 at 50Mhz and it runs fairly hot without cooling. Nothing like the 040 though but at the time a 060 is as hot as a 040 it's probably fried and gone so I would be carefull with that if I where you.

I got a desctop with extra feets and a fan just to be safe.. will probably overclock it slightly (55Mhz or so as this system is extremly stable). As with all overclocking... better to be safe that sorry... get some cooling on that chip! :-D

[mantisspider]

whats the performance difference between a 68040/40 against a 68060/25, 68060/40, 68060/50, and above? just how fast can the 68k go too?

i have never used a 68060 so dont know just how quick they feel. For graphics apps, workbench, wordprocessing, games etc...

cheers, pardon my ignorance, ta :-)

[Brian]

060 doesn't exist in 25 or 40Mhz versions, just 50 and above. At 50Mhz the 060 is a bit over twice the speed of a 040/40 (and the FPU is about 2.5 times faster). 060 at 66Mhz is about 3 times faster than 040/40 (and FPU about 3.5 times faster). :-D

[Damion]

As with all overclocking... better to be safe that sorry... get some cooling on that chip!
 

That's good advice. According to my temperature
laser, the '060 @66mhz (60mhz chip) is running
between 29 and 37C (idle/load) WITH a fan,
heatsink and adequate ventilation...so without
it may get too hot (guessing 45-55C or more).
The chip can probably handle it but I'm not
risking it, at least with this particular chip.

[Karlos]

Brian wrote:
060 doesn't exist in 25 or 40Mhz versions, just 50 and above. At 50Mhz the 060 is a bit over twice the speed of a 040/40 (and the FPU is about 2.5 times faster). 060 at 66Mhz is about 3 times faster than 040/40 (and FPU about 3.5 times faster). :-D

Integer code optimised for superscalar execution can be a bit faster still ;-)