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AMD Radeon HD 7990 Review: Dual GPU Comeback

By Julio Franco
Apr 24, 2013
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  1. donutpolice

    donutpolice TS Rookie

    Time for all Nvidia fanbois to go jelly....
  2. Darth Shiv

    Darth Shiv TS Evangelist Posts: 1,159   +174

    Frame latency is an interesting measurement. Do you also bench latencies of different inputs in LCD panels?
  3. madboyv1

    madboyv1 TechSpot Paladin Posts: 955   +49

    What a monster of a card, but I'm totally not jelly, don't have the money for at $1000 GPU setup. =p

    Also, I think the Temperature chart on page 8 is mislabeled as a second power efficiency chart. =o
  4. St1ckM4n

    St1ckM4n TS Evangelist Posts: 3,466   +622

    Someone please explain how the card is consistently clocking better FPS than xfire'd GHz cards? Internal connector better than external...?

    The test bench mobo supports x16 lanes on both PCI-E slots, so it's not this...
    ghasmanjr likes this.
  5. Steve

    Steve TechSpot Staff Posts: 1,353   +440 Staff Member

    Not sure if consistently is the best word to describe it. The 7990 was slower in Tomb Raider and Resident Evil 6 by 6%, 5% slower in Far Cry 3 and 3% slower in Medal of Honor while the performance in Max Payne 3, DiRT 3 and Crysis 3 was the same. It was only 1% faster in Battlefield 3 and Sleeping Dogs (so you can call that the same) while the only game it was actually faster was Hitman Absolution. So by consistently you mean one game :)
  6. dividebyzero

    dividebyzero trainee n00b Posts: 4,839   +672

    Apples and oranges comparison. For a start, display latency is constant and shows itself by input lag, while GPU latency shows up by stuttering and inconsistent frame rates due to widely inconsistent frame rendering.
    An extreme example here:
    [​IMG]
    While the average for tri-crossfire looks pretty good, the actual user experience paints a different story:
  7. St1ckM4n

    St1ckM4n TS Evangelist Posts: 3,466   +622

    Steve 1% is 1%, I know it's very close (and probably in the realms of testing anomalies) but it's still 1%. The GHz card can even boost, so this is why I'm surprised the 7990 clocked better at ALL. :O
  8. Steve

    Steve TechSpot Staff Posts: 1,353   +440 Staff Member

    1% is certainly well within the error testing margin so it's not really any different from the other tests where the 7990 and 7970 GHz CF cards delivered the same performance. Again there was only one game where the 7990 was genuinely faster, why that was isn't exactly clear. Most likely do to the 7990 using a slightly newer driver.
  9. alex1234

    alex1234 TS Rookie

    AMD should have solved the crossfire latency issue first and then released this card. May be AMD is getting ready for their 8000 series. The game bundle coming with this card is extraordinary from AMD. I like the back plate, Nvidia should include those things in their high end cards(atleast). Nvidia is making a lot of profit compared to AMD.
  10. ghasmanjr

    ghasmanjr TS Booster Posts: 363   +86

    Another excellent review but I have one question to ask:
    Why did you test sli 660s? I was expecting to see sli 680s because that is the "single card configuration" for the 690 which is the direct competition of the 7990, the dual card configuration of the 7970.
     
  11. ghasmanjr

    ghasmanjr TS Booster Posts: 363   +86

    Btw, HOLY **** to the free games bundled with this thing. That is one impressive sales incentive.
  12. Steve

    Steve TechSpot Staff Posts: 1,353   +440 Staff Member

    Unfortunately we don’t have an endless treasure trove of graphics cards, if we had a second GTX 680 handy we would have included SLI results. The GTX 660 Ti SLI cards were included because … you guessed it we had two :)

    It is very hard to get as many high-end graphics cards as we do and hold onto them, getting two is all the more harder. Still you have the GTX 690 there so it shouldn’t be all that difficult to work out where a pair of GTX 680’s would be sitting on those graphs.
  13. Alpha Gamer

    Alpha Gamer TS Booster Posts: 247   +42

    Steve, all the games used in the test have great scaling under dual gpu solutions. Did you already know that beforehand and, therefore, conducted the tests or was it it just a happy coincidence?
    My point is: are there really that many games so well optimized out there so that we can consistently expect that kind of scaling ?
  14. Steve

    Steve TechSpot Staff Posts: 1,353   +440 Staff Member

    Certainly with AAA titles yes. These days Crossfire and SLI support is common and most games are supported, most quality games that is.
  15. Ranger12

    Ranger12 TS Guru Posts: 636   +117

    I'm still impressed with how 660ti's in SLI perform.They're consistently right up there competing with the top cards despite costing half as much.
  16. ghasmanjr

    ghasmanjr TS Booster Posts: 363   +86

    I understand and I appreciate the clarification. I'm just a little interested/biased towards seeing those results because I have 680s in sli :)
  17. cldmstrsn

    cldmstrsn TS Rookie

    I totally would be jealous if crossfire was better than SLI. But until AMD can get equal or better performance from their Xfire I will be sticking with Nvidia. So no jelly's here haha.
  18. $1000 worth of microstutter
  19. Coming back and forth from AMD and Nvidia I totally understand frame latency now. It's pretty obvious on AMD in most games. The new drivers that Nvidia released yesterday are supposed to push fps in popular games even more.
  20. amstech

    amstech TechSpot Enthusiast Posts: 847   +218

    It's no secret that my personal loyalties are with Nvidia. Over the past 5 years GTX's have been smoother cards with more features/less problems. It was nice to see the 7970 have the success it did but I still never considered it the single GPU king during that period because it came with an asterisk; it never definitively beat the 680 outright and still it loses stock for stock in games.
    7970 owners are only fooling themselves with thier performance claims...these results are devious and don't represent the stuttery gameplay or frametime results. Simply put, they are not as good as GTX's and never were.
    They are bang for your buck GPU's and that has not changed.
    A GTX is the best GPU money can buy and offers the smoothest, most feature rich gaming experience money can buy. Period.
  21. JC713

    JC713 TS Evangelist Posts: 6,944   +899

    What happened to the Prototype driver and the 13.5 driver? Toms Hardware used those.
  22. cmbjive

    cmbjive TS Enthusiast Posts: 506   +83

    Well, that about settles it.

    I'm getting two 660 TI's for SLI. As someone mentioned above it is surprising that these two cards perform almost as well as the $1,000 cards and cost several times less.
  23. Fbarnett

    Fbarnett TS Enthusiast Posts: 183   +24

    Why would you do that 1 680 would do better and I got news for you a lot of games don't work right with crossfire or sli
    Don't think that 2 cards are better than one look at benchmarks and you will see 1 680 will beat out 2 660ti.
  24. JC713

    JC713 TS Evangelist Posts: 6,944   +899

    Because, the 660Ti is a 680 with disabled cores, TMUs, and ROPs. It performs on par because it happens that some games are good at scaling. That is not true for a lot of games. With crossfire and SLI, there is a higher chance of graphical corruption. Fbarnet is right in that aspect, but a 680 is a better option because it can play most games on highest settings @ 1080P. If you arent playing on >1080P, dont SLI.


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