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    Radeon HD 6990M Crossfire vs Radeon RX 640

    If you are going to buy a new graphics card and are choosing between Radeon HD 6990M Crossfire and Radeon RX 640, 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 Crossfire stacks up against Radeon RX 640, check out specs charts below.
    Radeon HD 6990M Crossfire Check Price
    Radeon RX 640 Check Price

    Radeon HD 6990M Crossfire and Radeon RX 640 are Laptop Graphics Cards

    Note: Radeon HD 6990M Crossfire and Radeon RX 640 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 Crossfire or Radeon RX 640 here:

    Radeon HD 6990M Crossfire Laptops
    Radeon RX 640 Laptops

    Main Specs

      Radeon HD 6990M Crossfire Radeon RX 640
    Power consumption (TDP) 50 Watt
    Interface PCIe 3.0 x8
    Supplementary power connectors None
    Memory type GDDR5 GDDR5
    Maximum RAM amount 2x2 GB 4 GB
    Display Connectors 1x DVI, 1x HDMI, 1x DisplayPort
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    • Radeon RX 640 has 2 GB more memory, than Radeon HD 6990M Crossfire.
    • Both cards are used in Laptops.
    • Radeon HD 6990M Crossfire is build with Terascale 2 architecture, and Radeon RX 640 - with Polaris.
    • Core clock speed of Radeon RX 640 is 503 MHz higher, than Radeon HD 6990M Crossfire.
    • Radeon HD 6990M Crossfire is manufactured by 40 nm process technology, and Radeon RX 640 - by 14 nm process technology.
    • Memory clock speed of Radeon RX 640 is 5100 MHz higher, than Radeon HD 6990M Crossfire.

    Game benchmarks

    high / 1080p 35−40 5−6
    ultra / 1080p 21−24 3−4
    QHD / 1440p 16−18 2−3
    4K / 2160p 10−11 −
    low / 720p 60−65 16−18
    medium / 1080p 40−45 7−8
    The average gaming FPS of Radeon HD 6990M Crossfire in Assassin's Creed Odyssey is 414% more, than Radeon RX 640.

    Full Specs

      Radeon HD 6990M Crossfire Radeon RX 640
    Architecture Terascale 2 Polaris
    Code name Blackcomb XTX Polaris 12
    Type Laptop Laptop
    Release date 12 July 2011 12 August 2019
    Pipelines 2240 640
    Core clock speed 715 MHz 1218 MHz
    Boost Clock 1218 MHz
    Transistor count 2x1700 Million 2,200 million
    Manufacturing process technology 40 nm 14 nm
    Texture fill rate 38.98
    Memory bus width 256 Bit 64 Bit
    Memory clock speed 900 MHz 6000 MHz
    Memory bandwidth 112.0 GB/s
    Shared memory - -
    DirectX DirectX 11, Shader 5.0 12 (12_0)
    Shader Model 6.4
    OpenGL 4.6
    OpenCL 2.0
    Vulkan 1.2.131
    FreeSync +
    Laptop size large large
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