AMD has added five more chips to its line of Six-Core Opteron processors, offering a boost in performance with lower power consumption that current models.

The new additions include three six-core Opteron HE processor models are manufactured using a 45-nanometre process and can be used in serves with four, six or eight processors. The six-core chips consume 55 watts of power, on average, compared to 75 watts and 105 watts, for other models, according to AMD.

The new low-power chips - the 2GHz six-core Opteron 2423 HE, 2.1GHz Six-Core Opteron 2425 HE, and 2.1GHz Six-Core Opteron 8425 HE - are priced, in 1,000-unit quantities, according to AMD's most recent price list.

Lowering power consumption with the HE variants of the six-core Opteron allows servers based on chips to be packed more closely together inside a server, reducing the space it takes up. It also helps contain rising power costs as companies pack more servers into data centers.

The new six-core Opteron chips are already available in ProLiant G6 systems from Hewlett-Packard. Other vendors, including IBM and Dell, are readying servers to be released over the next month or so.

In addition to the introduction of the three Six-Core Opteron HE chips, AMD added two more chips to the lineup: the 2.8GHz Six-Core Opteron SE 8439 and 2.8GHz Six-Core Opteron SE 2439. Both chips consume 105 watts of power, according to AMD.