180MHz 603ev CPU upgrade for 5300ce?

[Trash80toHP_Mini]

With a little digging, I found this little sucker! It's a UMax C500 CPU 603ev 180MHz Module that I lucked into some quite some time ago. Started looking at grafting it into my 2300c some thirteen years ago, but the bus multipliers I was looking at didn't seem to give it much in the way of legs.



I think I was mistaken at the time, 603ev is the second generation of the CPU family, having a far more capable bus multiplier input:


If the 5300ce system is stable with a 9.29% clock chip, I think the 180MHz CPU might be stable running at 200MHz as well? That would equal the lower levels of the PCI Architecture 'Books. But at 180MHz, my 5300ce would be the champion of NuBus Architure 'Books by a fair margin. The 1400c tops out at 166MHz so an 8.43% advantage in the previous generation ain't too bad at all. With plausibility of a 200MHz overclock limit that would make for a 20.48% advantage over the 1400c/166.

First gen 603e CPU's PLL configs were limited to 4.1:1 and so topped out at 100MHz.


Recent gear shift makes a 5300c from the collection seems a better candidate for this than my beloved 2300c. With its beautiful 800x600 panel, PCMCIA on board. external display supporting VidCard and full gamut of I/0 hookups built right in, no dockage requirements the 5300ce is the winner hands down
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OK, 'nuff said, hit me with the slings-n-arrows of rational thought about these assumptions/prospects?

 

[croissantking]

Interesting idea, but the 603ev is lower voltage than the 603e so it wouldn’t be a drop-in replacement.

Even if you could get around that, it would still be cacheless, therefore a 1400/166 would be much faster.

 

[Trash80toHP_Mini]

Dang! That'd be impact from the sling on a trebuchet.

I thought it was the same from the info I've found so far. Third gen is definitely low voltage. Have you got linkage to the 603ev datasheet? I've yet to find it.

Good point about the Cache, my runnig1400s are all G3 equipped, so benchmarking wouldn't be in the cards anyway.

Thanks for the reality check.

 

[croissantking]

Dang, that was about impact from the sling on a trebuchet.

I thought it was the same from the info I've found so far. Third gen is definitely low voltage. Have you got linkage to the 603ev datasheet? Apparently I've yet to find it.

I don’t, this is anecdotal (see the post here)

Good point about the Cache, my runnig1400s are all G3 equipped

Yeah, the Nubus PPC PowerBooks are hobbled by a missing L2 cache (except for later 1400s) and a 32-bit data bus. Clock speed isn’t the whole story.