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Introduction Less than a year after the chassis overhaul that gave the iMac its new slimline bodywork, Apple's innovative desktop computer enjoys another revision. This time, it's a minor refresh, bringing Haswell processors, better GPUs and faster WiFi, but retaining the form factor of the previous generation. It's an unsurprising move. Last year's update had already radically redesigned the all-in-one Mac, dropping the optical drive in favour of a new slimline design with better speakers, a revamped and less reflective screen construction, USB 3.0 ports and a second Thunderbolt port. The upgrades for this year's model are all internal. If you were hoping for a Retina display, you'll be disappointed. Naturally, the iMac isn't the only slimline all-in-one computer out there. The Scan 3XS Mirage AIO245 costs over £1,000 (about US$1,600, AU$1,600) for the entry-level model, which is not much cheaper than the cheapest 21-inch iMac, but it features a larger 23...

There's no getting away from it, this is the graphics card we've been waiting for since we first heard about Nvidia's Kepler GPU architecture. The GTX 780 Ti is simply the most powerful graphics card on the planet right now and the first to sport the real full-fat GK 110 graphics processor. When it unleashed the impressively efficient GK 104 chip, with the GTX 680 as the vanguard, we had our suspicions it wasn't the full fat Kepler chip Nvidia had been working on. And so when we heard about the Tesla K20 and K20X professional cards, with their massive GK 110 GPUs and frighteningly-fast floating point performance, inevitably we wanted one. But time, she passed, and there was no talk of the top Kepler chip ever making its way down into our gaming PCs. And we were sad. Luckily for us AMD pulled its finger out and delivered the HD 7970 GHz update and gave the GTX 680 a wee shoeing in the benchmarks. Nvidia had to hit back, and whether or not the GK 110 chip was ever mea...

Finally, after all the messing around with rebranding almost its entire line of HD 7000 series cards with the new Rx prefix, AMD is launching a genuinely brand new graphics card with a brand new GPU. Ladies and gentlefolk, we give you the Radeon R9-290X and its Hawaii XT graphics processor. This is AMD's second stab at an ultra-enthusiast card to rival the top tier of Nvidia's lineup, namely the GTX Titan and, more importantly, the GTX 780 . The first, the dual-GPU HD 7990 , had an ultra-enthusiast price point and in general it had performance to match. The issue was that when you start banding around multi-GPU cards against similarly performing single-GPU options, there's only going to be one winner. One GPU on its own can be trusted to simply work with any game you care to throw at it, especially a few months or years down the line. Relying on people to keep fashioning multi-GPU drivers or profiles specifically for one niche graphics array is far more of a gamble. And s...