Fastest 040 CPU?

[Neo]

@Jose

Might depend on what board you have. For the CyberstormPPC board it
appears that the only thing that matters is to use as high rates as
possible. Could be different for 060's though. (They use different
clocking)

[Neo]

Aarg! I just succeded with the infamous breaking of coppertracks on
my PPC board. :-x

These surface mounted resistors are just to small. Should have used a
torch instead. Usually gives better result as long as you don't put
the board on fire.

Well, now I have a nice little copper wire instead of the original
track. Looks really amaturish!

But hey, isn't that how a true Amiga should look like! :-P

[Jose]

Blizzard 1240@40mhz here.  I 'd like to put an 060 on it but it's very hard finding a cheap one :-(

[Amiga1200PPC]

Approx. 20 MHz is the lowset speed a standard 68040 can go.
68060 circuits are completely of static type IIRC and can go down to nearly 0 MHz.

[patrik]

@Jose:

www.vernalelm.com charges $85 USD which by todays dollar rate is a fair price.

These 68060 should be recycled and be of the oldest 01F41G mask, but it is still a 060 and the price is right.


/Patrik

[PMC]

I bought a 25Mhz Apollo 040 five years ago and have gradually upped the speed starting from 28Mhz, 33Mhz and finally 40Mhz.

I've added a heatsink between the fan and the ceramic surface of the chip and everything seems to be pretty stable considering that my CPU is running at 160% of the stated speed!

[Framiga]

Hi patrik

yes right but only if you are very lucky :-)

Some of theese Vernalem 060, has problems with FPU and MMU. (and this explains the low price).

Ciao

PS- I've ordere from Vesalia 2 weeks ago, an XC68040RC33M (PGA ceramic FULL FPU-MMU with the last 40 Mhz mask) for only 12,90 EURs . . . .not delivered yet :-(

I've post to Vesalia for info about the shipment
 but with no reply as usual.

Vesalia and Amiga.fr has 060 also but contact them about the specs before ordering (Vesalia 89 EUR, Amiga.fr 189 EUR)

[FlagshipAmigaLover]

Hi Neo,

Just remember, it is not wise to over-clock a processor.  Most processors become unstable and untrustworthy when they are over-clocked.  I recommend to anyone needing a faster processor to BUY a faster processor.  Processors should only be run at their rated speed.  The hotter a 68040 gets the slower it runs, so one of the secrets to gaining speed is keeping the heat down.  Neo, just make sure that there is a heatsink and a good quality fan mounted onto the 68040 and it should give you years of troublefree service.  Also, the MC version of the 68040 runs cooler and a little faster then the XC version.     :-P

[Neo]

@FlagshipAmigaLover

Yea, you are right about that it's not safe to run a CPU above it's
rated speed. I have fitted a fan on the heatsink to try to keep it
below 40°C.

Well, about buying a faster CPU! I would gladly do it if I just could
get hold of a retailer selling a 2 GHz 68060 CPU for about $100. I
just think $300 is a little to much for a 50 MHz 68060, which is the
one I would like to have.

And anyway, overclocking is a sport on it's own. If I blow the CPU
I'll just have to put a new one in! 8-)

About the difference between the XC and MC versions. This also applies
for the 68060 CPU's. I'm not sure but I'll think MC is the industrial
rated components.

[ronybeck]

I seem to recall some 100Mhz 68040 being churned out for Crashintosch.  Don't know if any one got them working on an amiga though.