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Memory Bandwidth: Analysis And Summary

Nvidia GeForce GTX 650 And 660 Review: Kepler At $110 And $230
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First, we plotted the frames per second achieved by each card. Then, we used the benchmark results with no anti-aliasing as our 100% reference point and calculated the percentage of this for the other settings. This illustrates how much of their original performance the cards lose when anti-aliasing is applied and no CPU or GPU limitation is in play.

Performance at 1920x1080

Performance at 2560x1440


The varied benchmark results published by different sites prove that, in many games, more demanding presets are more or less able to conceal the GeForce GTX 660 and 660 Ti's bandwidth disadvantage. Because its GPU is inherently less powerful, though, the GeForce GTX 660's memory bottleneck is less likely to be felt. 

How about the relationship between the GK104- and GK106-based GeForce GTX 660s? Both slot in somewhere behind AMD's Radeon HD 7870. The gap between them grows with increasingly more intensive levels of anti-aliasing.

Four observations surprised us. First, we witnessed very linear scaling among AMD's Radeon boards as we increased AA settings. Second, it's impressive to see the GeForce cards hold their own, even at higher resolutions, providing they’re not forced to contend with 4x MSAA or more. The third surprise was that two Radeon HD 7750s in CrossFire were able to outpace the GeForce GTX 660 and 660 Ti. Finally, we were surprised to dig up an OEM card based on a pared-down GK104 GPU, although we weren't pleased with what we found. A higher shader count doesn't compensate for a lower core clock. So, without overclocking the board Nvidia is selling to OEMs turns out to be slower than retail cards with the same name.

So what does this tell us?

Nvidia's GeForce GTX 660 is most competitive when its GPU is taxed, deemphasizing its narrower memory interface. At stock settings, the OEM-only GK104-based GeForce GTX 660 is considerably slower than the GK106-based retail model. Not surprisingly, then, we have to take serious issue with Nvidia’s naming scheme, since buying a tier-one box with a GeForce GTX 660 is going to stick you with a much less powerful product and no intuitive way to see that.

Does the same handicap apply in compute-oriented workloads?

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  • 29 Hide
    lahawzel , September 13, 2012 2:23 PM
    Goddamn Mike NY Gmail or whatever the hell your name is supposed to be, here, proper commenting etiquette:

    1. Read the article.
    2. Understand what the article is talking about.
    3. If you find an urge to comment about "______ sucks" or "_______ wins again", especially when the article says the opposite of what you want to post, chances are your comment will look dumb as hell when it's posted and earn you 20 downvotes. Therefore, don't post that goddamn poor excuse of a "comment".
  • 26 Hide
    Anonymous , September 13, 2012 2:30 PM
    Why are there giant gaps in both lineups? AMD has the 7770 at $130 and 7850 at $230 -- nvidia has the 650 and 660 at similar price points -- ideally for my budget would be something in the $150-170 price range, but I either have to compromise or shell out more. It seems like an obvious market gap.
  • 25 Hide
    EzioAs , September 13, 2012 2:31 PM
    Nice article to be honest. I'm really glad you tested the Radeon cards with the new driver compared to other review sites.

    I've got nothing else to say on the GTX650 but to just point out that it's a weak card.

    On the other hand, the GTX660 is probably the only Kepler (besides the 670) that impresses me. I don't know about everyone else though. To point out one thing, most Radeon 7870s can be found at $240 or lower without MIR. The GTX660 is priced well for a release MSRP and makes the 660ti offers less value, kind of like the 670 vs 680. For 8xMSAA, the performance does cripple but I think at this price point, most people are going to stay with 4xAA or possibly lower.
Other Comments
  • 21 Hide
    EDVINASM , September 13, 2012 1:35 PM
    Was waiting for GTX 650 to see if it can beat the old GTX 550 Ti but it seems other than power draw it's no match. Might as well keep my GPU until next NVidia lineup. GTX 660 on other hand is only €50 cheaper than GTX 660 Ti meaning its a no budget saver to buy non Ti version. Fail...
  • 29 Hide
    lahawzel , September 13, 2012 2:23 PM
    Goddamn Mike NY Gmail or whatever the hell your name is supposed to be, here, proper commenting etiquette:

    1. Read the article.
    2. Understand what the article is talking about.
    3. If you find an urge to comment about "______ sucks" or "_______ wins again", especially when the article says the opposite of what you want to post, chances are your comment will look dumb as hell when it's posted and earn you 20 downvotes. Therefore, don't post that goddamn poor excuse of a "comment".
  • 26 Hide
    Anonymous , September 13, 2012 2:30 PM
    Why are there giant gaps in both lineups? AMD has the 7770 at $130 and 7850 at $230 -- nvidia has the 650 and 660 at similar price points -- ideally for my budget would be something in the $150-170 price range, but I either have to compromise or shell out more. It seems like an obvious market gap.
  • 25 Hide
    EzioAs , September 13, 2012 2:31 PM
    Nice article to be honest. I'm really glad you tested the Radeon cards with the new driver compared to other review sites.

    I've got nothing else to say on the GTX650 but to just point out that it's a weak card.

    On the other hand, the GTX660 is probably the only Kepler (besides the 670) that impresses me. I don't know about everyone else though. To point out one thing, most Radeon 7870s can be found at $240 or lower without MIR. The GTX660 is priced well for a release MSRP and makes the 660ti offers less value, kind of like the 670 vs 680. For 8xMSAA, the performance does cripple but I think at this price point, most people are going to stay with 4xAA or possibly lower.
  • 11 Hide
    EzioAs , September 13, 2012 2:37 PM
    Quote:
    Why are there giant gaps in both lineups? AMD has the 7770 at $130 and 7850 at $230 -- nvidia has the 650 and 660 at similar price points -- ideally for my budget would be something in the $150-170 price range, but I either have to compromise or shell out more. It seems like an obvious market gap.


    The 6870 might be more compelling at that price point. Newegg still sells them. It's too bad that AMD didn't release a 7830 or something similar from the Nvidia side. But chances are, you probably can get the 7850 or 660 below $200 by the end of the year. Fingers cross though.
  • 7 Hide
    tomfreak , September 13, 2012 2:37 PM
    mikenygmailThanks for the attempted compliment, but call me Mike. I'm glad you've been paying attention.It was more of a joke than anything else to simply write "AMD wins again!" and it was actually pretty funny! I try to balance things out so that no one company is viewed too favorably.For example, I recently bought an Nvidia GTX 460 1 GB 256 bit card for $70, new, with a 3 month warranty for a friend to upgrade his gaming computer. Unusual? Yes. Great deal? You better believe it! Of course, if an equivalent AMD card was available at a cheaper price, that's the one I would've bought.Now, relax and try to control yourself. Refrain from the use of profanity in future posts. Thanks.
    they cant even dare to put up a weaker 460SE up against 650 let alone a full 460. I guessing the 650 got trash hard when u put serious shader and resolution on it. It is a garbage card @ $110.
  • 12 Hide
    EzioAs , September 13, 2012 2:38 PM
    Quote:
    Gtx 660 is the only option in mid-range gpu


    That is if you don't need the compute performance in which AMD clearly leads
  • 15 Hide
    Anonymous , September 13, 2012 2:39 PM
    I totally agree with TomFreak

    another thing, i would prefer more comparison to old cards like the 460 1GB (256bit). i am sure alot of gamers still use that old card
  • 12 Hide
    jimbaladin , September 13, 2012 2:39 PM
    Buy a 7850, overclock it. Win.
  • 20 Hide
    cleeve , September 13, 2012 2:48 PM
    TomfreakHow "nice" of u tomshardware. By only compared 7750/7770 vs 650 in high detail but not comparing 7750/7770 on the Ultra detail, then when u pull out a 460 SE/9800GT for benchmark, u are taking away 650(why?). Is it because 650 performance is too poor to show off on benchmark? It doesnt take a genius to figure out the huge diff between 6870 vs 650. 7770= 6850 speed. So I guess even the 7750/460SE are putting shame on 650 on those high quality detail? too shy to show off 460SE/9800GT up against 650?I dare u put on a detailed benchmark with 650 up against 7770/7750/GTS450/550ti/460/9800GT/9800GTX on all condition. Not a selective benchmark.


    Dude, we included the 650 for reference at high details in the rest of the benchmarks. The info is there, just trying to keep it focused.

    It's all there. Just look for it.

    Tomfreak I guessing the 650 got trash hard when u put serious shader and resolution on it.


    It did, look at the numbers from the other high detail benches. The 460 kills it.

    But the 460 192-bit is too expensive for a direct comparison, so I didn't include it in the standard low-detail benches. It has a higher price point than the 7770.
  • 21 Hide
    Gman450 , September 13, 2012 2:55 PM
    NVIDIA seriously needs to step up their mid range cards! The 650 is weaker than expected...
  • 21 Hide
    EzioAs , September 13, 2012 3:01 PM
    Quote:
    NVIDIA seriously needs to step up their mid range cards! The 650 is weaker than expected...


    True. I thought it could at least give the 7770 some competition, but as it turns out it's slower than the 7750. But actually, that's to be expected since it's basically a GT640 with GDDR5. They should probably called it a GT645 or GTS640. It doesn't deserve the GTX name
  • 5 Hide
    tomfreak , September 13, 2012 3:09 PM
    CleeveDude, we included the 650 for reference at high details in the rest of the benchmarks. The info is there, just trying to keep it focused.It's all there. Just look for it.It did, look at the numbers from the other high detail benches.
    according to the bench, each game have 2 presets, the similar priced 7770/7750 is missing on the second higher bench on most games. Would be love the 6870 being replace with 7770/7750 on the second game bench.
  • 5 Hide
    bawchicawawa , September 13, 2012 3:13 PM
    WHY didn't they add the 7770 to the 1920 x 1080 preset? =\
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