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Sapphire Radeon X800GTO2

Sapphire Radeon X800GTO²

The best worst-kept secret in the graphics market right now?

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Review Nvidia's GeForce 6800 GS chip is a respin of the 6800 GT. It's built on a 110nm process enabling it to offer higher clock speeds and, as such it has taken a lead over the cards based on ATI's X800 GTO. However, Sapphire is exclusively offering a part called the X800GTO². The 'squared' refers to the fact that this card's GPU has one 'quad' of pipelines that has been disabled, but that with a bit of jiggery-pockery from a BIOS flash and an overclocking tool, it can be turned from a 12-pipeline 400MHz card into a 540MHz 16-pipeline graphics card.

Sapphire Radeon X800GTO2

How so? This is because, unofficially at least, this card is to all intents and purposes an R480 - ie. an X850 XT. So why is ATI selling full-on X850 XT's as the lowly X800 GTO? Because X850 XTs were at one point very expensive to make, but as its manufacturing process matured costs came down, ATI is able to offer a much cheaper card by producing a full working R480 core and then disabling a pipeline quad. However, by thinly disguising the fact that it can be modded, ATI is able to generate buzz and a lot of mid-range sales, all pretty good for the bottom line. So while it says X800 GTO on the box, Sapphire might as well have written it in crayon over the X850 XT sticker. That said, there's no official support and BIOS flashing will void the warranty.

This means that instructions on how to modify the card aren't included in the box, but you can find them easily using a web search engine. The process should be trouble free, but I did run into problems. Once flashed, the card refused to generate a picture on our test system and it turned out that there was a rare incompatibility with our motherboard. After switching to another motherboard, the card booted fine and had successfully been upgraded 16 pipelines.

The card is a fairly regular looking thing. The heatsink spears to be copper rather than aluminium, to take care of the extra heat from the expected overclock. There's a power connector on the back, which is definitely necessary.

Once I'd flashed the card, I installed the popular ATI Tool utility to enable me to overclock the card. To see if the card lived up to the hype and being an impatient type, I didn't bother being cautious. I pushed the core and memory all the way up to X850 XT PE speeds - 540MHz for the core and 590MHz for the memory - and set it off to run. It did so without fuss for the entire run of benchmarks without image quality being affected. Again, there's no guarantee that this will be the case for every card. The cooler is also not as big as the one on the standard X850 XT PE, so good air-flow in your PC case is essential.

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