<div dir="ltr">Experiment says....<div><br></div><div>It works. They are totally interchangeable. I have yet to run heavy burn-in tests, that comes next. It still reports as IIe from ob, but correctly reports the 512kb cache and new frequency.</div><div><br></div><div>Dan.</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Jan 10, 2025 at 7:55\u202fPM Ethan Hawke via rescue <<a href="mailto:rescue@sunhelp.org">rescue@sunhelp.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Dan,<br>
<br>
Interesting question, the IIe+ is pin compatible with the IIe, it's <br>
changes are the following:<br>
- Higher clock frequency (up to 650MHz)<br>
- Additional Energy Star Ratios (1/4 and 1/8 in addition to the <br>
original 1/2 and 1/6)<br>
- Doubled L2 Cache to 512KB<br>
- Doubled memory support up to 4GB<br>
<br>
The Sun Blade 100 and 150 also run the same firmware.<br>
<br>
However the additional memory line will need to be routed for 4GB <br>
support, so 4GB may not be possible in the SB100 even with a IIe+.<br>
<br>
Generally Sun used external programmable PLL clock chips that load a <br>
safe low speed and are updated during POST, it should be possible to run <br>
at 650Mhz, but I can't guarantee.<br>
<br>
And of course Sun may also detect the CPU replacement and disable it in <br>
firmware to prevent "cheap" upgrades.<br>
<br>
In summary, I can't see how it could damage an SB100, but it may not <br>
work at all or some features may be ignored.<br>
<br>
Only one way to find out!<br>
<br>
Cheers,<br>
Ethan<br>
<br>
On 11/1/25 14:12, Dan Moisa via rescue wrote:<br>
> Basically moving the UltraSparc IIi (550 or 650 MHz and 512 kB of L3 <br>
> cache) from the Sun Blade 150 into the Sun Bade 100 that has the <br>
> UltraSparc IIe (500 Mhz and 256 kB of L3 cache).<br>
><br>
> Some rando claims that yes, this is possible: <br>
> <a href="https://community.unix.com/t/are-ultrasparc-iie-and-ultrasparciii-interchangeable/379996/4" rel="noreferrer" target="_blank">https://community.unix.com/t/are-ultrasparc-iie-and-ultrasparciii-interchangeable/379996/4</a> <br>
> but of course the evidence no longer exists.<br>
><br>
> What do you think?<br>
><br>
> Thanks,<br>
> Dan<br>
><br>
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</blockquote></div>