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With specifications that were once considered enthusiast-level, these affordable, gamer-friendly cards provide a formidable amount of processing power for the asking price. As a consequence, being a PC gamer has never been more affordable, with the Radeon HD leading the initial charge. It offers some additional perks for a higher premium. Otherwise, both cards sport the same basic architecture, including stream processors, 40 texture units, a transistor count of million and a bit memory bus. All in all, that's some very nifty specifications for the asking price. For the purpose of this review, we AMD Mobility Radeon HD 4870 tested ATI's reference board, which the current crop of HD cards are identical to for an example, check out our Sapphire Radeon HD review.

While very impressive in its own right, we should begin to see tweaked boards with additional features in the coming months, so patience may well be a virtue. In the time being though, let's take a look at the daddy. This should make it easier to set up a CrossfireX configuration with two or more cards in the one machine. Because of its higher power consumption, the HD requires two 6-pin power connectors as opposed to the HDwhich runs off a single 6-pin power connector. Nevertheless, it remains quite energy-efficient, with idle power consumption rated at a reasonable Watts.

Much like the HDthe card gets very hot during operation — expect temperature levels to reach 90 degrees when the card is under load.

You may therefore want to take additional cooling precautions before you make any overclocking attempts. You can find full technical details of the silicon gubbins that lie at the heart of the in our original Radeon HD series review.

But to recap briefly, the really clever bit is how ATI has managed to up the shader and texture count by per cent courtesy of a boost in transistors of just 40 per cent. In AMD Mobility Radeon HD 4870 respects, the is no different from the cheaper It has the same shaders, 40 texture samplers and 16 render output units. Likewise, it sports an identical DirectX But that's no surprise. Cranking up the clocks Thetherefore, is all about clockspeeds.

AMD ATI Radeon HD 4870

In terms of core frequencies, it ups the ante by MHz to MHz. However, the big news is memory clocks.

But ATI has bolted the very latest 3. Factor in the GTX's 2. The only other significant difference is a change in form factor and power consumption.

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The is a dual-slot board that requires two six-pin power cables where the is a single slotter that can survive with a single power cable. Anywho, you can read all about the GTX 's architectural nitty gritty in our review. What about the benchies? AMD Mobility Radeon HD 4870 first performance test is the 3D technofest that is Crytek's Crysis. It's both the most advanced and most graphically demanding PC game yet. With all the image quality options set AMD Mobility Radeon HD 4870 full reheat, it will bring any video board to its knees.

The Radeon HD is no different in that regard. Running at the popular 1, x 1, widescreen resolution and all the options set to maximum but without anti-aliasing enabledthe cranks out 21fps on average. The GTX manages 26fps.

AMD ATI Mobility Radeon HD X2 (Crossfire) - Tech

That's a performance delta of 24 per cent. In both cases, you'll need to knock a few of the options down a few notches to get acceptably smooth performance.


Moving on to one of the most popular current shooters, Call of Duty 4, the gets even closer. At 1, x 1, and 4x anti-aliasing, the manages 58fps to the GTX's 64fps. That's a difference of just 10 per cent.


More importantly, it's small enough that you'll really struggle to feel the difference in game. It's almost the same experience for around half the price, in other words. What's more, even at a monstrous resolution like 2, x 1, the GTX AMD Mobility Radeon HD 4870 only 18 per cent quicker in Call of Duty 4. It's a similar story running an older favourite like Half-Life 2 at 1, x 1, Here, fps for the plays fps for the GTX.

The gaming performance of the ATI Mobility Radeon HD should be comparable to, but still a bit below, the desktop HD The high  Notebook Size‎: ‎large. Specifications and benchmarks of the AMD ATI Mobility Radeon HD X2 video cards for ok Size‎: ‎large.

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