Intel has warned that 366MHz and 400MHz Celerons it released early this week are likely to have clock locking built into them. That follows a report on hardware site The Overclockers Comparison Page that two enthusiasts who have what they say are retail CPUs, are able to overclock them to speeds of 550MHz and 600MHz. An Intel representative confirmed the company was building locks into future processors. "We're not telling people exactly how we're doing it because we don't want them to break the method," he said. "Early samples [of the 366MHz and 400MHz] parts are not clock locked, but production parts will be," he said. "Customers may find that if they go out to buy one in order to overclock it, it will not work," he added. ® Related Stories Intel says days of overclocking over Opinion: Intel whited sepulchre on overclocking