Dealers and computer makers have begun to list prices on AMD's upcoming Athlon XP processor, which officially goes on sale on Tuesday. The Athlon XP 1800+, which sources say will be released on Tuesday, is currently being advertised by resellers for $254 and $255 (about £178) on Price Watch, a shopping site dedicated to computers. Atacom, a California-based reseller, won't ship the part until after the chip comes out, company representatives said. Advertisements are also popping up for an Athlon XP 1500+ computer from Fujitsu-Siemens for 1,022 euros, or £657. Athlon XP is the latest version of AMD's flagship processor. The upcoming chips feature improvements that allow the processor to run on less power and thus produce less heat. Additionally, AMD will try to popularise a new naming convention that does not feature megahertz, the typical way of designating a chip's speed. The Athlon XP 1800, for example, will run at 1.5GHz. The new naming convention is justified by AMD under the principle that the 1.5GHz Athlon stacks up with a 1.8GHz Pentium 4 in terms of performance on typical computing tasks. The "XP" part is also new. The posted prices closely match the price of the 1.8GHz Pentium 4, which sells for around $256. An AMD representative declined to comment on unannounced products, but the company has said that the XP chips come out next week. Processor prices have declined this year more than normal due to sluggish sales and intense competition between Intel and AMD. AMD said Friday that it will report a pro-forma loss of approximately $90m to $110m due to price pressures. Chips from the Sunnyvale, California-based chipmaker often sell at discounts from the "official" wholesale prices because of the way AMD sells its chips. Distributors and major PC makers often get substantial discounts from AMD on orders of over 1,000 chips. These chips then eventually find their way to the "gray" market of unauthorised dealers. Partly because of internal antitrust policies, Intel offers much more modest discounts on its processors. Consequently, gray market prices for Intel chips generally remain slightly above the wholesale price. Staff writer Kai Schmerer contributed to this article from Germany. See Chips Central for the latest headlines on processors and semiconductors. See the Hardware News Section for full coverage. Have your say instantly, and see what others have said. Click on the TalkBack button and go to the Chips Central forum Let the editors know what you think in the Mailroom. And read other letters.