WIth its custom Vapor-X cooling and 2GB of memory strapped to a blue PCB, does Sapphire's latest Radeon HD 4890 have the extra grunt and overclocking power to make us want to buy?

After being impressed by the AMD's new ATI Radeon 4770 HD 512MB graphics card, we're taking a look at our first partner design from Gigabyte. At £88 it's more expensive than both the reference design and other models on the market, so we take a look at what we get for our extra few quid.