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    Radeon HD 6990M vs Radeon R9 M385X

    If you are going to buy a new graphics card and are choosing between Radeon HD 6990M and Radeon R9 M385X, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the Radeon HD 6990M stacks up against Radeon R9 M385X, check out specs charts below.
    Radeon HD 6990M Check Price
    Radeon R9 M385X Check Price

    Radeon HD 6990M and Radeon R9 M385X are Laptop Graphics Cards

    Note: Radeon HD 6990M and Radeon R9 M385X are only used in laptop graphics. They have lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with Radeon HD 6990M or Radeon R9 M385X here:

    Radeon HD 6990M Laptops
    Radeon R9 M385X Laptops

    Main Specs

      Radeon HD 6990M Radeon R9 M385X
    Power consumption (TDP) 100 Watt
    Interface MXM-B (3.0) PCIe 3.0 x16
    Supplementary power connectors None
    Memory type GDDR5 GDDR5
    Maximum RAM amount 2 GB 4 GB
    Display Connectors No outputs No outputs
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    • Radeon HD 6990M is connected by MXM-B (3.0), and Radeon R9 M385X uses PCIe 3.0 x16 interface.
    • Radeon R9 M385X has 2 GB more memory, than Radeon HD 6990M.
    • Both cards are used in Laptops.
    • Radeon HD 6990M is build with Terascale 2 architecture, and Radeon R9 M385X - with GCN.
    • Core clock speed of Radeon R9 M385X is 385 MHz higher, than Radeon HD 6990M.
    • Radeon HD 6990M is manufactured by 40 nm process technology, and Radeon R9 M385X - by 28 nm process technology.
    • Memory clock speed of Radeon R9 M385X is 600 MHz higher, than Radeon HD 6990M.

    Game benchmarks

    high / 1080p 14−16 8−9
    ultra / 1080p 8−9 5−6
    QHD / 1440p 3−4 0−1
    low / 720p 30−33 18−20
    medium / 1080p 16−18 10−11
    The average gaming FPS of Radeon HD 6990M in Assassin's Creed Odyssey is 80% more, than Radeon R9 M385X.

    Full Specs

      Radeon HD 6990M Radeon R9 M385X
    Architecture Terascale 2 GCN
    Code name Blackcomb XTX Strato-XT-M3
    Type Laptop Laptop
    Release date 12 July 2011 16 June 2015
    Pipelines 1120 896
    Core clock speed 715 MHz 1100 MHz
    Boost Clock 1100 MHz
    Transistor count 1,700 million 2,080 million
    Manufacturing process technology 40 nm 28 nm
    Texture fill rate 40.04 61.60
    Floating-point performance 1,601.6 gflops 1,971 gflops
    Memory bus width 256 Bit 128 Bit
    Memory clock speed 900 MHz 1500 MHz
    Memory bandwidth 115.2 GB/s 76.8 GB/s
    Shared memory - -
    DirectX 11.2 (11_0)
    Shader Model 5.0 6.3
    OpenGL 4.4 4.4
    OpenCL 1.2 Not Listed
    Vulkan N/A
    FreeSync +
    Bus support PCIe 3.0
    Laptop size large large
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
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