Complaints about Apple's Power Mac G5 TV advertisement have been uphealed by the Independent Television Commission (ITC).

The ad, screened in the first three weeks of September, claimed Apple's newest computer was the "world's fastest, most powerful personal computer". Apple backed up its findings in a White Paper published on its Web site.

Apple's vice president of hardware product marketing Greg Joswiak, also backed-up the claims at the time of launch, claiming that the company had "used an independent lab and provided full disclosure of the methods used in the tests, which would be a silly way to do things if Apple were intending to be deceptive."

However, the ITC argues that insufficient evidence exists for this claim.

The ITC acted following eight complaints from TV viewers, who called Apple's ad misleading: "Because the main claim was based on the results of limited tests in which the specification of the computers was configured to give Apple the best results," said ITC.

The ITC confirms that before the ad was broadcast an independent technical expert at the Broadcast Advertising Clearance Centre checked evidence provided by Apple to substantiate these claims.

The ITC looked into Apple's claims following these complaints. It found they were not supported by independent reviews and "at best the G5 was generally as fast as the best Intel-based workstations currently available".

ITC added that it: "Shares one viewer's doubt that the claim could be substantiated at all because, as evidence for and against the claim had shown, computers were constantly being updated and had many different applications and benchmarks."

It would appear that Apple also recognises this to be the case. The company has recently updated product information on its Web site. Rather than calling the G5 "The World's most powerful computer", it is now referred to as "The World's first 64-bit personal computer".

Apple's ad will not be re-shown in its present form, according to the ruling.

The company was unavailable for comment.