Here's a rare beast: an overclocked gaming system that doesn't use an Intel processor but instead uses a watercooled AMD one. But don't let that put you off, as YOYOTech's Water Dragon 940 is a capable, extremely well put together system unit.

It also makes a nice change that the name of a system actually represents what's inside, in this case Water as it's watercooled, Dragon because it‘s based on AMD's Dragon platform and 940 because it's powered by an AMD Phenom II X4 940.

The Phenom II X4 940 is one of AMD's latest quad core processors with 512KB of L2 cache per core (2MB total) and 6MB of L3 cache shared between the four cores. As standard it has a clock speed of 3GHz but in YOYOTech's system this has been overclocked to 3.6GHz.

Keeping the processor cool is a tidy water cooling installation courtesy of a Cool IT Domino ALC compact water cooling pump and fan combination. If the only water cooling you have seen involves huge radiators and big bore pipes which put you off, then this setup may change your mind about the whole liquid cooling idea.

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To be classed as a Dragon platform there has to be the following; AMD Phenom II processor, AMD 790 series chipset and a HD4800 series graphics card. The first part of the triangle is in place, and next up is a motherboard with a 790 chipset. For this YOYOTech has used a brand new Sapphire motherboard, the CrossFireX Pure 790GX which, as you can gather from the name, uses the GX version of the 790 chipset.

The board has four DIMM slots, two of which are filled with two 2GB modules of Corsair TwinX PC2-6400, 800MHz DDR2 memory. Overall performance is pretty good as you might imagine with an overclocked CPU, the Water Dragon 940 scoring an impressive 10,778 overall in PCMark05.

The third part of the triumvirate is an HD4870 graphics card, another Sapphire product; the Sapphire 4870 512 which comes with 512MB of super fast GDDR5 memory running at 1,800MHz (3.6GHz effective) and a 790MHz core clock. With this much graphics hardware, running today's bandwidth hungry games poses little problem, as nicely illustrated by the average frame rate score of 43fps in World in Conflict (1,280 x 1,024 resolution, all in-game details set to maximum or high).

Storage is provided in the shape of a 320GB Samsung Spinpoint hard drive, which in our case had a copy of Vista Home Premium 64-bit installed on it, but the vast majority of YOYOTech system boxes are sold without an OS, as their customers are normally experienced users who will use their own copy of any operating system.

All this hardware comes fitted into a Cooler Master 690 case which comes with a perspex side panel: that's good as it would be a crime to hide away the superb internal build quality of the Water Dragon 940. We see a good many systems and without any shadow of doubt this is one of the best built systems we have ever seen, with all cabling neatly tied up and as many cables as possible hidden behind the motherboard plate.

You may think there isn't a need for clean cable runs, but it does more than look good: it helps in the all important role of keeping the air circulation in a case as unobstructed as possible, minimising damaging hot spots.

If you are looking to upgrade your system unit and want something a little different from the usual Intel based box, then YOYOTech's Water Dragon 940 is worth a second look. Extremely well put together and with enough power to sort out today's leading games, the Water Dragon 940 also offers value for money.