Franc Zabkar wrote:
On 30 Mar 2006 13:56:09 -0800, "larry moe 'n curly"
put finger to keyboard and composed:


Are UTT (UnTesTed) memory chips really untested by their manufacturers,
or were they tested by their manufacturers and then rejected?

I can't believe that chip makers would produce untested chips, except
under contract, because they have to test chips to grade them by speed,
don't they?


Don't memory chips have redundant blocks that are used to improve
yields? If so, wouldn't this imply that all memory is tested, at least
to some extent?

- Franc Zabkar

Normally there are fuses that are programmed at wafer final test. Of
course if you want to buy wafers that haven't yet been through WFT or if
you want to buy wafers that have been tested and programmed and repeat
your own testing at relaxed margins I'm sure the manufacturers will be
happy to take your money.

--
Del Cecchi
"This post is my own and doesn’t necessarily represent IBM’s positions,
strategies or opinions.”