Kaveri Hybrid CrossFire: The A10-7850K & A10-7700K With R7 240 & 250



/ 8 months ago

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Introduction – Dual Graphics (Hybrid CrossFire) on Kaveri


Kaveri_hybrid_crossfire (1)

Kaveri represents another significant step forward for integrated graphics performance but realistically it still isn’t even on the same playing field as true discrete graphics solutions which aren’t as limited by memory bandwidth or physical space. However, AMD has always had a solution for making its APU graphics performance more competitive and this solution is known as “Hybrid CrossFire”. However, AMD has recently changed the nomenclature and Hybrid CrossFire is now dubbed “Dual Graphics” so this will be used in this article interchangeably with Hybrid CrossFire.

The term “hybrid” in Hybrid Crossfire is coined because it is a hybrid amalgamation of “discrete-class” integrated graphics on the APU with a discrete graphics card. The logic of CrossFire is still retained in Hybrid CrossFire – you should pair two similar graphics processors to scale extra performance through synchronisation and joint GPU processing. In the case of Hybrid CrossFire you aren’t dealing with only graphics cards like you would be with normal CrossFire, but instead GPUs so it can be problematic, though the objective is still to pair similar parts. AMD does set out some official recommendations for which R7 series GPUs you should pair off with each Kaveri APU – we will detail those recommendations on the next page. A final thing to briefly mention is frame pacing. AMD have released a driver fix for frame pacing which effectively fixes the problem of delayed “runt” frames. In our case we have enabled the frame pacing driver but we lack the equipment to show you how effective this frame pacing driver is. However, we can point you to PCPer who have investigated the driver fix to show that it does solve the problem and offers identical performance to what you would get with the frame pacing setting turned off.

In this article we will be taking a look at what AMD’s Dual Graphics can offer in terms of a performance upgrade for Kaveri APUs, so without any further ado let’s take a look!

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  • Derek Johnstone Macrae

    Damm, your a fast worker Ryan…excellent

    • http://www.eteknix.com/ Ryan Martin

      Thanks! And to that comment ^ yes I think you’re right too. I’m not 100% how Dual Graphics normalises the cards but as far as I know they have to operate at the same GPU core frequency and GPU memory frequency, in that sense the APU holds back the discrete cards which are clocked much higher but in terms of shaders I think all 512 on the APU are able to be used with the 384 on the discrete card though you may be right that the number of shaders have to be normalised to 384 on both units too.

      • Derek Johnstone Macrae

        I built an FM1 system when the apu’s first appeared, with a 6670, I found I could overclock the apu with my ram, but as soon as I tried to run DG, the performance was actually worse than just running the 6670 alone, I had to let the apu run at stock to get decent fps with DG enabled, the 6670 was running ddr3, so I tried a ddr5 card, overclocked again, and found that performance was slightly better, but still, not as good as the apu or 6670 running alone, I also tried overclocking the ram and clock speed on the 6670’s, without overclocking the apu but found the performance increase was only around 5%, I concluded that the apu is downclocked to the gpu specs, specifically, the shader cores and core speed on the apu are locked to the cards gpu specs when running DG, but not the memory, overclocking the system ram gave me serious problems, hence the terrible performance when trying to run an overclocked apu with a stock 6670, my advice is this, if you plan to overclock an apu, dont invest in another gpu, as the performance will not be as good as you think, run everything at stock and you should see 100-60% scaling depending on what apu+gpu combo you get, as it is, the best combo for DG at the moment is a A8 7600 and a R7 240 gddr3, the bang for buck is seriously impressive, what would be nice, would be a specific A10 DG card for the 7850k chip, with 512 shader cores, but AMD will never sanction a card like that.

        • Derek Johnstone Macrae

          and can you guess how many cmos resets I had to perform to learn that lot ??? lol…

  • Derek Johnstone Macrae

    seems the fact your limited to bonaire cards is hurting performance, with the A10 7850k, your effectively dropping down to the R7 250’s lower spec of 384 shaders….

  • Enis

    Herkese türkiye den selamlar r7 260x amd 10 7850k işlemci ile uyumlu mudur ? başka hiçbir yerde uyumlu olduğu söylenmiyor. Google translate den bu kadar :

  • enis

    Greetings to everyone from turkey r7 is compatible with 260x processor amd 10 7850? It does not say anywhere else is compatible. Google translate so well:)

    • http://www.eteknix.com/ Ryan Martin

      It is “compatible” but you cannot use the GPU on the R7 260X and A10-7850K at the same time. Aka the A10-7850K will work but only as a CPU while you use the R7 260X as a GPU, hybrid crossfire X does not work with an R7 260X.

  • enis

    I bought r7 260x dual graphics alone can not. Catalyst dual graphics is not doing well. Although I’ve Bios settings. Is there a solution?

    • http://www.eteknix.com/ Ryan Martin

      Dual Graphics is not compatible with the R7 260X. You’ll have to just use the R7 260X on its own.

  • Tropical Thunder

    you seem to have forgot something.let’s say we would buy an A88X mother board and 750K+R7 260X which is GDDR 5 PCIe 3.0 graphic card.to use the PCIe 3.0 on the motherboard they would require you to use an AMD APU.so how would we deal with PCIe 2.0 bottle neck issues?i’m going to buy a system but i got 600$ only.i’m having a hard time choosing 7850K APU due to its incompatibility with R7 250X

    • http://www.eteknix.com/ Ryan Martin

      PCIe2.0 16X will not bottleneck any single GPU card compared to PCIe 3.0 16X. If you used a dual GPU config you might see a 3-5% performance hit.

      • George

        This.
        Guys, stop worrying about PCIE 3.0, it’s a marketing gimmick, no real gains for graphics really.
        I rock two HD 7870GHZ 2gb overclocked on a z68 i7 system using two PCIE 2.0 8x slots and they work FLAWLESSLY.

    • That guy

      Can’t dual graphics with the 260X. Needs to have no power connector. Besides, a 7850K and the R7 250 still make some very promising numbers especially while gaming in 1080P.

  • Mitchell Koole
    • http://www.eteknix.com/ Ryan Martin

      No I don’t think so. R7 250 only (not 250X).