IDF Intel's 45nm 'Penryn' processor comes in many forms, all derived from this tweaked version of the chip giant's Core 2 microarchitecture and targeting different segments of the market. Here's our guide to the many personalities of Penryn and their codenames.

Wolfdale DP

Dual-core Xeon server chips with 6MB of L2 cache. Again, they will be made available in three power-consumption grades: 40W, 65W and 80W. They're set to ship alongside the Harpertowns.

Harpertown

Among the first Penryns to ship - they'll be coming out from 12 November - these quad-core Xeon-branded server chips will contain 12MB of L2 cache. Intel is planning to offer three ranges, respectively targeting compact, not-to-compact and big iron servers, and rated with 50W, 80W and 120W maximum power consumption ratings.

Dunnington

This Harpertown derivative is designed specifically to fit in servers currently equipped with Xeon 7300-series 'Tigerton' quad-core processors and likely to follow the same 50W, 80W and 130W power consumption grades. We'll find out more in H2 2008 when Dunnington ships.

Penryn

Yes, it's the same name as the generic 45nm architecture, but that hasn't stopped Intel codenaming its upcoming mobile Core 2 Duos and Core 2 Extremes Penryn too. All due in Q1 2008, they're dual-core parts with 3MB or 6MB of L2 cache. Expect to see a 2.8GHz Core 2 Extreme X9000 at launch, along with four 'Santa Rosa refresh' Core 2 Duos: the T8100, T8300, T9300 and T9500, clocked at 2.1GHz, 2.4GHz, 2.5GHz and 2.6GHz, respectively.

Penryn QC

Intel's first mobile quad-core chips are due to debut in Q3 2008 with 6MB or 12MB of cache, depending on model.

Yorkfield

The basis for the 45nm quad-core desktop CPUs, set to go on sale as the gamer-friendly Core 2 Extreme QX9650 and the Core 2 Quad Q9000 series, comprising the the 2.5GHz Q9300, the 2.66GHz Q9450 and the 2.83GHz Q9550. These contain 6MB to 12MB of L2 cache and consume up to 95W in the case of the Quads and 130W for the Extreme. The latter will be launched on 12 November, with the others coming in Q1 2008.

Wolfdale

Intel's 45nm Core 2 Duo desktop processors. Dual-core chips with 3MB or 6MB of L2 cache, shared by both cores. Consumes up to 65W and is due to go on sale in Q1 2008, when it will debut as the Core 2 Duo E8200, E8300, E8400 and E8500, clocked at 2.66GHz, 2.83GHz, 3.0GHz and 3.16GHz, respectively.

Silverthorne

Possibly not a Penryn at all, but it's certainly a 45nm part and certainly designed specifically for UMPCs. It's due H1 2008.