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Old 18 December 2019, 23:15   #1
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Testing a 50MHz MC68030RC50C

I bought one from eBay's funkward-tech. Seems to work OK.

Am I right in saying there is no definite way to interrogate the CPU in software, and that the only way to be sure it's not relabelled is to see if it stands up to stress long-term? Hours of Mandelbrots? What's your test?
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Old 20 December 2019, 00:27   #2
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With a 060 WhichAmiga Will read out the Rev version. I cant remember if the same happens on a 030.

I read on EAB that all Rev C 030 have the same die as each other, so a 25Mhz is internally the same as a 50Mhz. As the Rev C was produced later in life it was easier to just have 1 chip and badge them differently.

I have a gold top Rev C 25Mhz in my normal use A1200 and that runs fine at a constant 50Mhz.
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Old 20 December 2019, 09:27   #3
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There is AFAIK no way to check 030 revision. And you can't always see by testing, f.e. I have had both 68030RC50B and 68030RC50C : no visible difference in behavior.

First thing to do would be to activate the MMU to verify it's not EC030 instead.
Then run some cpu intensive program during one hour or two and see if it gets hot - real 68030RC50C does not need any cooling at all.
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Old 18 January 2020, 21:56   #4
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Originally Posted by meynaf View Post
- real 68030RC50C does not need any cooling at all.
Completely so simply it is not, it also depends strongly on the voltage.
If the system runs with e.g. 5.1 volts, the heat development is much higher then with 4.85 volts and cooling can help in case of instability.
For general it is right that a 030 C-Revision needs no special extra cooling. It also depends on free space around the processor.

I have an old turbo card Blizzard 4030 that runs well for years overclocked at 60Mhz with a 50 MHz PGA-030 B-Revision and two small passive heat-sinks applied by myself.
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