ATI Radeon HD 4890 vs. Nvidia GeForce GTX 275

Gamers looking to spend $ 250 on a brand new graphics card were given two new options last month when ATI launched their Radeon HD 4890 and Nvidia countered with the GeForce GTX 275.

Starting with the Radeon HD 4890, this new card is essentially an overclocked Radeon HD 4870 with far greater overclocking capabilities. ATI fine tuned the RV790 XT core to enable incredible core frequencies. Although the default core speed of 850 MHz is a modest increase over the 4870, many users report overclocks on the order of 1 GHz and beyond, which makes for an interesting update.

The GeForce GTX 275 is also a derivative of an existing product and borrows its GPU from the GeForce GTX 295, a graphics card with two GPUs. The GTX 275 uses a 55 nm GPU with the same number of SPUs and TAUs as the more powerful GeForce GTX 285 and only as many ROPs as the GeForce GTX 260. Nvidia then increased the core and memory frequencies of the GeForce GTX 275 in comparison on the dual GPU GeForce GTX 295.

On paper, the GeForce GTX 275 is similar to the GeForce GTX 285, a graphics card that costs an additional $ 100. The main difference between these two products, aside from their slightly different core configurations, is their memory bus width. The more expensive GeForce GTX 285 gets the 512-bit bus, while the GeForce GTX 275 has a 448-bit bus or about 20% less bandwidth is available.

Fortunately, in addition to being a quick and easy counter for the Radeon HD 4890, the GeForce GTX 275 was the perfect counter too. Before the launch of these two cards, the Radeon HD 4870 and GeForce GTX 260 were already struggling. The Radeon HD 4890 was supposed to outperform both products and hit the $ 250 price range, but apparently it didn't go as planned.

Today we're going to test both cards and see which ones are faster in a variety of games with the latest drivers. We'll also look at Maximum Overclocking Performance to help you decide which option is best for enthusiasts and PC gamers alike.

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