Wanted: 68040!

[darksun9210]

i just clocked up my warp engine to 40Mhz just swapping the crystal without changing the cpu. yeah yeah i know, naughty me.  :roll:  but i had a massive heatsink and fan on there with thermal paste.
ran fine rendering for days and days...  :-D

as ever, your mileage may vary, and i take no responsability for any damage caused etc etc.  :lol:

--edit--
iirc, warpengines used 25Mhz 040's and clocked them up to 28Mhz, as i seem to remember them doing a deal where you could buy just the board and swap in the CPU off your A3640 card....

[darksun9210]

no i don't think so. i sold mine (as a 28Mhz clocked to 40Mhz) with AMD K6-2 heatsink and fan. about 8-9 years ago :-)

[darksun9210]

same as the cyberstormII/040, iirc had an 80Mhz crystal on there.
just like the BlizzardPPC040 has a 50Mhz clock crystal for a 25Mhz 040.
something to do with the crystal feeding a phase locked loop (PLL) circuit inside the CPU to generate the CPU/Bus timing.
i also recall, but may be incorrect, that the internal frequency of an 040 is double the external bus speed. kinda like a 486DX2. which would also explain why Mac Quadra's of the 040 era were marketed as 25/50, 33/66, and eventually 40/80 cpu speed denominators?

my memory is hazy as it was a good few years since i had my warpengine and was playing about with variable frequency oscilators. so ignore me if i'm talking out my rectum :lol: