This story: http://www.infinityplus.co.uk/stories/blit.htm ?
There's a similar plotline in one of the Star Trek episodes with the Borg, where (IIRC) they discuss the morality of crashing all the Borg's minds with some bug they've found in their information processing, decide not to, and then discover they already sort of did that by accident....
That's the one I had in mind, yes.
Today's post, Why Are Individual IQ Differences OK? was originally published on 26 October 2007. A summary (taken from the LW wiki):
Discuss the post here (rather than in the comments to the original post).
This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was No One Knows What Science Doesn't Know, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.
Sequence reruns are a community-driven effort. You can participate by re-reading the sequence post, discussing it here, posting the next day's sequence reruns post, or summarizing forthcoming articles on the wiki. Go here for more details, or to have meta discussions about the Rerunning the Sequences series.