ATI's Answer to SLI: CrossFire (The Motherboard)

As with NVIDIA's multi-card graphics solution launch, ATI is bringing to market their Radeon Xpress 200 CrossFire-Edition chipset. Motherboards based around CrossFire will feature 2 physical PCI Express x16 slots with x8 electrical connections. If the motherboard manufacturer implements it, the second PCI Express slot does not require a selector card and can be used with any other x8 or lower device. When only one graphics card is installed, the BIOS is capable of reconfiguring dynamically the number of lanes that the PCI Express slots run, provided that the motherboard includes support for this feature. Some vendors will sell motherboards set up just like NVIDIA's solutions (more on that later).



Limiting the cards to only 2 x8 PCI Express connections may be a bottleneck if a game makes heavy use of the bus. Of course, we will run into similar issues with NVIDIA's solutions when paired with games that are PCI Express intensive. Unfortunately, as none yet exist, testing of this category of application is very difficult.

The Xpress 200 CrossFire-Edition is also capable of supporting integrated graphics. One excellent feature of the Xpress 200 CrossFire system is that, on boards where the OEM has included integrated graphics and two display outputs, 6 displays can be driven simultaneously (two from the integrated graphics, two from the standard Radeon, and two from the CrossFire card). Having the ability to support so many displays, while also offering the speed up of multiple GPUs is quite compelling; especially if ATI allows multiple GPU operation alongside multiple display support.

The need to buy a new motherboard in order to upgrade to a multiple GPU solution will likely keep some people from upgrading, but NVIDIA's solutions have the same problem. The fact that CrossFire is only being offered for the X800 and X850 series does limit the upgrade potential at this point. We have been recommending against using multi GPU solutions as an upgrade path option, but offering that freedom is still a plus.

ATI has given us the indication that CrossFire should work on Intel Chipsets as well as their own. This could give new life to those Intel designs originally targeted at SLI. Though not explicitly stating that CrossFire will work in an NVIDIA SLI board, it definitely seems possible. From an adoption/compatibility standpoint, ATI is certainly "evaluating other options".

There is also no physical reason why SLI cards could not work in an ATI Xpress CrossFire-Edition motherboard. The only thing that should stand in the way of this combination is NVIDIA's driver support. With the price premium that NVIDIA charges for their SLI chipset, it is clear that they want to discourage users from going another route. As they had owned the market on multi GPU solutions until now, that was an option. Now that ATI is throwing some competition in the ring, it would not be smart to exclude potential customers from using SLI just because of their motherboard choice.

Index ATI’s Answer to SLI: CrossFire (The Card)
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  • Bloodshedder - Monday, May 30, 2005 - link

    Kind of makes me wonder about compatibility with All-in-Wonder cards. Reply
  • RadeonGuy - Monday, May 30, 2005 - link

    why didnt you run it on a FX-55 and 1gig of memory

    Reply
  • Quintin - Monday, May 30, 2005 - link

    interesting.... Reply
  • ksherman - Monday, May 30, 2005 - link

    #6, Id love too, but I dont have the money right now and the cards are not availible... Reply
  • Brian23 - Monday, May 30, 2005 - link

    #9, #10, and #11: That will never happen. The traces between the GPU and the memory need to be UBER short. The socket would increase trace lengths too much. Plus there is so many kinds of graphics memory with different bus widths. Reply
  • Waylay00 - Monday, May 30, 2005 - link

    What would be better is a motherboard that has a built in GPU socket and you could buy the GPU's just like CPU's. Then there would be no need for video cards, but rather just video RAM and the GPU core. Reply
  • Waylay00 - Monday, May 30, 2005 - link

    Reply
  • UNCjigga - Monday, May 30, 2005 - link

    What I really want is a graphics card with extra sockets for a 2nd GPU and more RAM. So I can start with one board with a single GPU and 256MB RAM, then I can upgrade either the existing GPU with a faster one, and/or upgrade the RAM from 256MB to 512MB, and/or slap a second GPU into the extra socket and effectively double performance. That would rock. Reply
  • arfan - Monday, May 30, 2005 - link

    Good Job ATI Reply
  • bob661 - Monday, May 30, 2005 - link

    I wonder what the REAL price will be on the Crossfire cards. Reply

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