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Originally Posted by Matt Krass
Not true. I've done it, like I said, I have the RAM stick on my desk in the computer lab at school, it's charred on one chip, the board had the jumpers set to 133 and it was 100 I believe, it didn't burn out right away, but after a few minutes.
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You're describing something like a short or severe overheat on one of the chips (though 100 -> 133 shouldn't do that, and SDRAM doesn't normally overheat in a single chip only); he's talking about the contacts themselves being damaged. This is usually due to a crooked DIMM, but it's possible (though rather unlikely) that he somehow managed to jam it in backward.
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Originally Posted by Matt Krass
Newer computers would fail a POST, but AT style stuff was stubbornly determined to run, even if it was blowing itself out in the process.
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Very, very few AT motherboards used DIMMs. He's likely got an ATX board. And I think that the generalization is a little bit of a stretch....
As for the voltage, a 5 V EDO DIMM (usually from a Mac) will have a different notch pattern, that would render it impossible to insert into a PC motherboard properly, unless you've somehow got a board which was designed to support both voltages and pinouts (I've never heard of such a thing).
By the way, don't put the good DIMM in the bad slot; in fact, don't put anything in there.