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  (Source: Amazon)

  (Source: Amazon)
AMD's newest is an alternative to NVIDIA's last generation high-end

Hot on the heels of NVIDIA's GTX 200 family launch, AMD will introduce its 55nm RV770-based Radeon 4850 next week. 

The Radeon 4850 features a 625 MHz core clock and GDDR3 clock in excess of 2000MHz. Corporate documentation explains that the 480 stream processors on the RV770 processor offer considerable enhancements over the 320 stream processors found in the RV670 core, though AMD memos reveal little about how this is accomplished.

The RV770 includes all the bells and whistles of the RV670 launched in November 2007: Shader Model 4.0, OpenGL 2.0, and DirectX 10.1.  The only major extension addition appears to be the addition of "Game Physics processing" -- indicating a potential platform for AMD's recent partnership with Havok.

The new Radeon lacks GDDR5 memory, promised by an AMD announcement just weeks ago. Although the RV770 does support GDDR5 memory, this initial launch consists exclusively of GDDR3 components.  AMD documentation hints at the launch of a Radeon 4870 later this summer, but it offered no comment on when it will eventually ship a GDDR5 product.

If Radeon 4850 sounds familiar, that's because it is. The RV770-based FireStream 9250, just announced a few days ago, broke the 1 teraflops barrier using the same graphics core.  However, this paper-launched workstation card will retail for more than $900 when it finally hits store shelves.  The mainstream Radeon 4850 offerings will ship and launch on the same day next week.

AMD partners claim the new card will not compete against the $600 GTX 200 just announced yesterday. Instead, AMD pits the Radeon 4850 against the recently re-priced NVIDIA GeForce 9800 GTX.  Distributors claim the 4850 will see prices as low as $199 at launch -- well under the $299 MSRP for GeForce 9800 GTX.  More expensive versions of RV770 will feature HDMI, audio pass-through and possibly the fabled Qimonda GDDR5 memory.

Specifications from Diamond Multimedia marketing material claim the new Radeon will require a 450 Watt power supply for single card support; or 550 Watt power for CrossFire mode.

Update 06/09/2008: As of this morning, AMD has lifted the embargo on its 4850 graphics cards. AMD's newest documentation claims the RV770 processor contains 800 shaders, but the card is not expected to show up on store shelves before the planned June 25 launch date.

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RE: Cool!
By ChronoReverse on 6/17/2008 3:43:44 PM , Rating: 2
Magic 8-ball Speculation says the 4850 CF already does.

With that said, I dislike CF and SLI because of the micro-stutter. If the 4870x2 really gets rid of that as rumoured, then it'll certainly be a smash.

RE: Cool!
By FITCamaro on 6/17/2008 4:14:57 PM , Rating: 2

RE: Cool!
By ChronoReverse on 6/17/2008 4:21:48 PM , Rating: 3
It's a term coined for the effect multiple GPUs have on the framerate when using AFR mode.

It's caused by the frames not being displayed smoothly because the multiple GPUs do not produce the frames in a steady stream but rather in bursts of n (where n is the number of cards).

While not a problem for everyone the effect does exist and is the reason why a single GPU tends to produce a smoother framerate.

There are rumours that the 4870x2 has something that will mitigate this (apparently it's not a simple solution... the rumours are about memory sharing between the GPUs) but I wouldn't put any hope into that until it's seen.

RE: Cool!
By hadifa on 6/17/2008 7:34:40 PM , Rating: 2
And it is mostly associated with low frame rate situations which is a category where Crysis obviously falls under.

RE: Cool!
By NullSubroutine on 6/20/2008 6:38:41 AM , Rating: 2
from the AMD slides I have seen there is no pooled memory (unfortuneatly). From what I can tell from their slides its the same design as the R680 but with a PCI-E 2.0 16 bridge chip rather than the 1.1. And that they will use GDDR5.

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