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AMD RD790 naked shot (Source: HKEPC)
RD790 to gain triple and quad CrossFire capabilities

AMD is preparing to update its aging 580X chipset later this year with the upcoming RD790. The upcoming RD790 serves double duty as the single and dual processor platform of choice for AMD desktop products. RD790 introduces 41 PCIe 2.0 lanes to AMD’s Socket AM2+ platform for Stars-family processors.

Motherboard manufacturers can distribute the PCIe lanes in many configurations, including four PCIe 2.0 x16 slots with eight-lane signaling. With all 41 PCIe 2.0 lanes, the RD790 chipset has a TDP up to 10-watts. AMD roadmaps reveal the multiple PCIe 2.0 slots are used for an improved CrossFire multi-GPU technology. The improved CrossFire multi-GPU technology supports up to four ATI Radeon HD 2900 XT graphics cards in Quad CrossFire configurations.

Unlike NVIDIA’s SLI, which supports dual or quad graphics cards in SLI, the improved CrossFire solution can take on three cards for improved performance. AMD claims CrossFire scaling with three cards yields a 2.6x performance increase. Two cards in CrossFire yield a 1.8x performance improvement. AMD roadmaps do not divulge how well CrossFire scales with four GPUs.

Expect RD790 to arrive later this year in time for the AMD Phenom product launch in single and dual processor configurations.

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RE: so...
By CyborgTMT on 7/11/2007 2:26:23 AM , Rating: 0
Yes, no, and depends. It's all about what you want from your system. If you are an avid gamer who is playing a lot of titles on XP, Nvidia is the route you want to take. If you play newer titles on Vista, the ATI/AMD solution is better right now when comparing cost to performance (notice how I didn't say the 2900XT's take the top crown away). Now if you fall into my category, a heavy overclocker, the 2900's are too good to pass up.

I could care less about fan noise or power draw, all my systems are watercooled/peltier/phase cooled and are sucking enough juice to dim a city block. With only 2 cards in crossfire mode these cards are already taking top spots on 3DMark:
If more headroom is created with the shrink to 65nm, I will be happily throwing 3 or 4 of these into one of my systems.

Oh, and before the fanboys rate me down - I'm currently running a Sli rig for gaming so I play no favorites, I only care which card gives me the most power.

"A politician stumbles over himself... Then they pick it out. They edit it. He runs the clip, and then he makes a funny face, and the whole audience has a Pavlovian response." -- Joe Scarborough on John Stewart over Jim Cramer
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