Wanted: 68040!

[alexh]

If you can find an MC68040RC40A with a mask of L88M then it will run almost cold at 40MHz (compared to the original ones which could melt diamond at 25MHz)

The history of the 68040:(backed up with Motorola / Freescale data)

*In 1989 it went into production as the XC68040RCxxyy originally a 0.8um masks (D43B, D50D, D98D, E31F) part. These run exceptionally hot even at 25MHz and need heatsinks all the time.

*In 1995 the 68040 qualified to mc status. It was shrunk to a 0.65um mask (E42k) these parts run hot at 25MHz but dont need heatsinks, famous in MAC circles for overclocking. There are some XC 0.65um parts from 1992-95 with the mask E26A but I am unsure as to their heat dissapation or overclockability.

*In 2000 the 68040 was shrunk to a 0.57um mask (K63H) these run a lot cooler that all previous parts and again do not need heatsinks at 25MHz+.

*Finally in 2002 the last MC68040RCxxA mask was made (L88M) production was moved back to MOS11 FAB, again at 0.57um, with increased reliability (which should favour overclocking even more).

[alexh]

Kin-Hell wrote:
@ alexh
Did you ever find a 40Mhz 040? I should have a redundant one soon if the price is right!  ;-)

I only wanted a L88M variant. I have other hotter ones.

delshay wrote:
there also the MC68040V which is 3.3v i dont know how hot it run.

AFAIK the 68040V cannot be used with Amiga's because the chips it talks to reply at 5v.

Kin-Hell wrote:
Cyberstorm MKIII uses 80Mhz for 40Mhz 040. Isn't it something to do with a divide-by-two counter on the chip?

You're not dreaming I've read something like that too, but it must be a feature of either Phase5 boards, or WarpEngine boards because they are uniquely different WRT to this.

[alexh]

AFAIK 060 is 3.3v core but 5v I/O. Making it perfect for Amiga but crap for FPGA.

The 68SEC000 (used on minimig) is 3.3v everything making it perfect for FPGA.

I *think* would depend on whether the 040V is half and half (like the 060) or full 3.3 (like the SEC) as to whether it would be compatible.

But I am not 100% sure about this (otherwise why is there no 060 MiniMig by Illuwater?)

A WarpEngine 040@40 is faster than an 060@50? I think not. (was that a joke? If so I didnt get it)

[alexh]

Kin-Hell wrote:
...but a CSPPC/CSMKIII card has two Capacitor settings within the socket.

They are not capacitor settings are they? I do not know what they are for sure. They perhaps somehow alter the output of the voltage regulator? I honestly do not know 100% how power electronics work (in general) let alone how the CSMKIII works.

Kin-Hell wrote:
In one position, it supply's 5v & the other 3.3v If the 060 requires 3.3 for operation, where would it draw its 5v power from when the card is set to supply 3.3v?

If it limits all the voltage inputs to all 68060 power pins then I would have to agree. But if it only affects one or two? I would have to read about 68060 more. But perhaps you are right? Which would be interesting.

However the signals coming FROM the Amiga will be 5v. So the 68060 inputs must be designed to accept 5v or they would break. (Or there must be additional electronics on all 060 boards)

Kin-Hell wrote:

alexh wrote:
A WarpEngine 040@40 is faster than an 060@50? I think not. (was that a joke? If so I didnt get it)

Not in terms of MIPS or FLOPS. Just in terms of around the Desktop.

It doesn't run faster but it does run faster? The mind boggles :-)

Kin-Hell wrote:
An 060 using 60ns ram on say a CSPPC or CSMKIII card with SCSI III drive is not as snappy on the desktop as a Warp Engine using 60ns Ram on a SCSI II drive.

How very strange. I suggest that some of the OS/desktop software you are using might use a feature of the 040 that is perhaps emulated in the 060? That would explain it. Or perhaps a bug in said software?

Interesting non the less.

[alexh]

zipper wrote:
What about the Chip RAM speed of said cards?

Can the speed at which accelerators access chip RAM be different? I would not have thought so.

If you were right, and KinHell is describing a card which doesn't have a gfx card, just AGA then that might explain it.

[alexh]

@Argus

Interesting, but benchmarks on Amiga Hardware Database show that the CSMKIII (& CSPPC) has better fast RAM performance than any other card.

The WarpEngine was not included in the test but it would have to be something special!

[alexh]

I wonder what is going on?

The SYSPEED fast RAM scores of A1240 on Amiga hardware database are (at best) 1/2 that of CSMKIII

6.95/26.24 vs 26.97/46.56

[alexh]

Use the new URL where possible.

http://www.bboah.com