IBM has unveiled three new rack servers aimed at business users running scientific, technical and financial applications that need large memory systems.

The x3455, x3655 and the x3755 are built on AMD's quad-core processors and are priced from $1,809 (£905).

The x3455 is a two-socket system with up to 48GB of memory while the x3655 model is also a two-socket model that can accommodate up to 64GB memory and is priced at $2,499 (£1,250). The third model, the x3755, has up to four sockets and 128GB of memory. Pricing begins at $3,407 (£1,705).

IBM says businesses can add processors according to their computing needs, and that all three servers will be available next month.

Volume shipments of AMD's Barcelona quad-core chip began in April after a delay due to a technical glitch. Other vendors, including Hewlett-Packard, have previously announced systems built on the AMD chip.

Gordon Haff, an analyst at US-based Illuminata said the chip is "a nice upgrade; it puts them back in the game for now against Intel". However, he said there's no financial data yet on how the chip is helping AMD.