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First look: AMD's ATI HD 4850 GPU

Darren Gladstone | July 1, 2008
The latest in the HD 4000 line--the Palit-branded, 512MB HD 4850--is currently in our Test Center, and is an elegantly designed, single-slot board that already looks to have top marks in the sub-US$200 weight class.

Then there's physics. nVidia may heavily tout the $400-plus GTX 200's built-in physics processors, but we're not yet seeing many developers using PhysX (that'll change soon, though). On the other end of the spectrum, AMD hedges its bets with partnerships. AMD has been talking about its GPU doing more than just graphics for ages, and recently the company announced that it is working with Havok's physics engine. Is it just me, or is it interesting that the Intel-acquired physics software maker is now in bed with the other big CPU maker as well? Combine that with the fact that nVidia makes a strong case for not buying top-end CPUs and I'm seeing a potential royal rumble brewing: Do both Intel and AMD see nVidia as a common foe? But I digress.

The Numbers Game

nVidia's G92-based 9800 GTX props up specs like a 675-MHz core clock and 2.2-GHz DDR memory strapped into a dual-slot card that requires two six-pin power connectors and a team of horses to run. By comparison, AMD's new board, built with a 55-nanometer manufacturing process, is all about efficiencies. It's got a lower core clock (625 MHz) and a lower memory clock (2 GHz) and yet manages to hold its own. That's due in no small part to the 800 stream processors (as compared to the 9800 GTX's 128). Not bad for a single-slot card that requires only one six-pin power connector.

Now, the caveats from last time still apply: We are continuing an initial shakedown run of a new graphical gauntlet. We are still hand-picking titles--current and upcoming--that'll challenge new hot-rod rigs, so that means no official scores on these graphics cards just yet. (Speaking of which, if there are games you'd like to see submitted into the official test list, let us know. Put your thoughts in the comments field!) All right, enough jibber-jabber. Touch gloves and come out fighting.

In Crysis, the Palit HD 4850 pretty much matches stride for stride with AMD's pricey--and beefy--last-generation card, a Sapphire HD 3870 X2. In Unreal Tournament 3, though, it's a whole other story. At both 1920-by-1200 and 2560-by-1600 resolutions, the HD 3870 X2 pulls ahead by 12 and 19 frames per second, respectively.

How does it hold up against nVidia cards? The 8800 GT runs the same numbers in Crysis until you turn on antialiasing. That's when the HD 4850 starts pulling ahead by a handful of frames. Hang on a second. What's that commotion in nVidia's corner? Just as AMD rallies, nVidia sucker-punches by dropping the price on overclocked 9800 GTX boards by 100 bucks, bringing 'em right in line with the HD 4850.


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