Here's the scratch from OCworkbench: "The Celeron 566 is the new overclocking king of year 2000. Almost 900mhz with almost no effort at all! What more can you ask for from an S$250 CPU? (I bought it at this price but as of this article, the Celeron 566 are retailing at S$189) I know that a lot of you with Coppermine CPUs will say that the CPU is slower Mhz for Mhz but you have to sacrifice speed for price, right. You get what you paid for so there you go. Have a good at trying out this beautiful chip. I'm trying to push it higher 1Mhz at a time. Need more time!!!"
FULL STORY @ OC WORKBENCH (http://www.ocworkbench.com/hardware/celeron566/celeron566.htm)