180MHz 603ev CPU upgrade for 5300ce?

[Trash80toG4]

Dunno, hoping I can find the critter somewhere around here.

Snagged a UMax SuperMac C500 CPU 603e 180 MHz Module fourteen years ago and haven't gotten anywhere with it as yet.
Started looking at grafting it into my 2300c some seven years ago, but the bus multipliers didn't seem to give it much in the way of legs.

Watched a vid @This Does Not Compute did on 5300s . . . when he lifted the heatsink in disassembly it was all over. I finally sucked it up and decided to go with the 5300ce from the collection instead of my precious Duo. Better heatsink arrangement, far better KBD and a fabulous, 1MB VRAM enabled 800x600@16bit active matrix LCD make that choice a no-brainer. No matter how much I wanted it crammed into my much used IRL in the day 2300c, that's just not gonna happen.

Dug up alksoft's FAQ and 5300 overclock page and figured out where I'd misconstrued the 4x bus multiplier limitation. Thinking that's a bit of a red herring for my use case. Those observations are based upon assumptions about the 5300 OEM CPUs.

Dug up every Datasheet I could find about the 603e and discovered the same four resistors on the 5300 board might be used to hit a 5.5x or even a 6x bus multiplier for my 180MHz 603e?

Looks to me that on the 5300's 33MHz System Bus a 5.5x multiplier ought to get this 180MHz CPU up to a slightly warm 183MHz? Cranking it to 6x would equal the clock of the 3400c/200. Swap in a 36MHz oscillator and it'd be a tad faster, but that'd likely be a bit too toasty?

Am I reading this all wrong or somehow have I wound up on the right track?

https://www.nxp.com.cn/docs/en/data-sheet/MPC603E7VEC.pdf

 

[Trash80toG4]

Dug thru two drawers full of accelerators, but didn't expect find it. Did find something interesting though.

PowerPump"ACCELERATOR" from NewerTech: is it worth cloning?

Dunno how many Apple 601 cards are out there or how many are in these three machines. But this looks pretty handy for pushing the limits on both sides of the dual processor setup. If there aren't enough of the PowerPump out there to go around, might make for an interesting project? Other than...

68kmla.org

Then I moved on to my very large Duo box and there it was in the little SuperDuo project box, pretty much as expected:

603ev is the second generation of PowerPC line, docs linked above appear to be for this generation given clock and PLL specs?

"PowerPC 603 is a low-power 32-bit microprocessor with RISC instruction set. The first implementation of the PowerPC 603 was based on 0.5 micron technology and featured 8 KB code and 8 KB data caches. Overall performance of this CPU was lower than similarly clocked Power PC 601. Processor performance was enhanced in the next revision of the chip - 603e. The 603e was manufactured on 0.35 micron CMOS process, had twice as large instruction and data caches, and included other minor performance improvements. The next revision of the family, 603ev, was a faster clocked revision of 603e. The forth, and the last, revision of the PowerPC 603 was 603et. This processor was manufactured on 0.29 micron technology, and was clocked at speeds from 200 to 300 MHz."

Dunno, digging a bit deeper tomorrow, now that I've found the little critter.