Triple-GPU Scaling: AMD CrossFire Vs. Nvidia SLI

Features
By Thomas Soderstrom
published

Two GPUs are great, but are three that much better? When it comes to multi-card scaling, can AMD finally beat Nvidia? Who really needs this much performance? We loaded a super-fast system in single-, dual-, and triple-GPU configurations to find out.

Benchmark Results: Aliens Vs. Predator

The first strike against AMD’s three-way scaling comes in Aliens vs. Predator, where overhead appears to make the triple-card configuration lose a little performance.

Multi-card scaling usually improves at higher resolutions and details, yet three-way CrossFireX still falls behind CrossFire using a pair of cards. It appears as though this title uses only two of AMD’s cards, and that might be a problem with Catalyst Application Profiles. Excellent scaling realized on Nvidia's three-way SLI setup adds insult to AMD’s injury.

Thomas Soderstrom
Thomas Soderstrom
Thomas Soderstrom is a Senior Staff Editor at Tom's Hardware US. He tests and reviews cases, cooling, memory and motherboards.
163 Comments Comment from the forums
  • amk09
    :( i wish i could afford that
    Reply
  • tacoslave
    wow even though a 6950 is weaker than a 570 it dominates at higher resolutions eyefinity here i come.
    Reply
  • scrumworks
    Impressive and unexpected results. Speculations that crossfire scaling is worse than SLI can finally be put into rest.
    Reply
  • aznguy0028
    scrumworksImpressive and unexpected results. Speculations that crossfire scaling is worse than SLI can finally be put into rest.Not true, I would have liked to see more games on the test. The choices were too limited for my taste. For example, everyone knows that Crysis is heavily Nvidia favored, so it's not surprising to see those results in the least.

    Here's another article on the 68xx series in Xfire
    http://www.xbitlabs.com/articles/video/display/radeon-hd6870-hd6850-crossfirex.html#sect0

    Xfire scaling was found to be 100% on 10 or the 19 games they tested, and remaining very high on the others. Nvidia and ATi seems to trade blows at different games tested, but it is evident that Ati has stepped up their Xfire drivers int he 6xxx series.
    Reply
  • aznguy0028
    scrumworksImpressive and unexpected results. Speculations that crossfire scaling is worse than SLI can finally be put into rest.I misunderstood what you meant. But yes, xfire/sli scaling has improved alot this generation :)
    Reply
  • liquidsnake718
    Now im thinking if i should even spend on a now older 5850 to crossfire on my X58.
    Reply
  • bavman
    Its really cool to see amd stepping up their game. Multigpu scaling used to be only good on nvidia, but now amd is beating them. Though i feel that more games should be tested before a firm conclusion should be drawn.
    Reply
  • _Pez_
    I would get two HD 6870 for a mobile crossfirex gaming rig ! :D
    Reply
  • anubis44
    No! Don't buy a 5000-series card to crossfire. The 6000 series cards are essentially all better at crossfire scaling than their predecessors. This performance advantage will likely only increase with additional driver revisions and better 6000-series optimization support than for older products.
    Reply
  • Maziar
    Great review ! It's good to see AMD did a lot of work on CF scaling.
    Reply