It's all about the platform. That's the most important single message AMD wants you to grasp regarding the simultaneous launch of its new graphics cards, CPUs and the new 790 FX motherboard chipset.

Well, that and the fact that AMD is the first company to launch such a complete desktop computing solution. Or was it that the 'Spider' moniker it has chosen for the new platform refers to the four cores of the Phenom CPU combined with chipset support for four graphics cards running in Crossfire mode?

All-in-one AMD

Whatever the case, AMD's central argument is this: Thanks to the purchase of graphics outfit ATI last year, it is now in a unique position to supply a full suite of high performance parts - chipset, processor and graphics.

This, AMD claims, gives it an unparalleled ability to deliver a highly optimised and stable desktop PC platform. The whole of Spider is much greater than the sum of its parts, in other words. It's extremely plausible. But is it true?

You can find our thoughts on the quad-core Phenom CPU and Radeon HD 3800 series graphics card elsewhere. But the heart of the new Spider platform, the glue that binds it all together, is the new 7 Series motherboard chipset.

Previously known under the RD790 codename, this is AMD's first chipset based on power-efficient 65nm process technology. Three versions, the 790 FX, 790 X and plain vanilla 790, cater for enthusiast, performance and mainstream markets respectively. All share the same basic feature feature set that includes a number of new technologies.

First up is the introduction of the PCI Express 2.0 interconnect. The doubling of bandwidth to data-hungry peripherals, most significantly graphics cards, is the main benefit. It won't make a huge difference for systems with a single video card.

But it does become significant in the context of the 790 FX's support for anything up to four ATI graphics cards running in Crossfire multi-GPU mode. AMD claims that quad Crossfire arrangements can deliver up to 3.2x the performance of a single card. That's an impressive sounding statistic and no doubt true in certain circumstances.

Multi-GPU minority

However, the take up of multi-GPU solutions of any kind has to date been pretty pitiful. According to one recent survey, they represent just 0.41% of the market in typical gaming PCs.