The Zotac nVidia GeForce GTX 275 AMP! Edition is an overclocked graphics card built around the GeForce 275 - nVidia's challenger to ATI's Radeon HD 4890 graphics chip.

Update - the Zotac has dropped significantly in price since we reviewed it. We'll be updating our review shortly.

Graphics giants nVidia and ATI release a huge variety of chips these days, so it's just as well that they've finally sorted out their naming issues.

Time was when graphics cards came out with a bewildering mix of model numbers - often attaching a lower figure to the faster cards, just to keep consumers on their toes. Thankfully those days appear to be behind us, and even without looking at the specifications, we can divine that the 275 comes somewhere between the 265 and 285 graphics chips. But where exactly does that ‘somewhere' fall. And, more to the point, does it fall higher than that of the ATI Radeon HD 4890?

So the GeForce 275 is nVidia's swift riposte to ATI's Radeon HD 4890. In essence the 275 is a 285 with less memory. That doesn't just stretch to the capacity (although, with 896MB of GDDR3 RAM rather than 1GB in the 285, the 275 does fall behind there too).

The memory interface is smaller too, swapping the 285's meaty 512-bit architecture for a mere 448-bit. But, before you write off the 275, nVidia has tried to keep up the clock speeds to compensate. The standard 275 sees a core clock of 633MHz and a memory clock of 1134MHz (2,268MHz DDR effective). These trail only marginally those of the 285.

NEXT PAGE: no ordinary 275

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