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    Radeon HD 6990M Crossfire vs Radeon R9 M270X

    If you are going to buy a new graphics card and are choosing between Radeon HD 6990M Crossfire and Radeon R9 M270X, 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 R9 M270X, check out specs charts below.
    Radeon HD 6990M Crossfire Check Price
    Radeon R9 M270X

    Radeon HD 6990M Crossfire is a Laptop Graphics Card

    Note: Radeon HD 6990M Crossfire is only used in laptop graphics. It has 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 here:

    Radeon HD 6990M Crossfire Laptops

    Main Specs

      Radeon HD 6990M Crossfire Radeon R9 M270X
    Interface PCIe 3.0 x16
    Memory type GDDR5 GDDR5
    Maximum RAM amount 2x2 GB 4 GB
    Display Connectors No outputs
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    • Radeon R9 M270X has 2 GB more memory, than Radeon HD 6990M Crossfire.
    • Radeon HD 6990M Crossfire is used in Laptops, and Radeon R9 M270X - in Desktops.
    • Radeon HD 6990M Crossfire is build with Terascale 2 architecture, and Radeon R9 M270X - with GCN 1.0.
    • Core clock speed of Radeon R9 M270X is 10 MHz higher, than Radeon HD 6990M Crossfire.
    • Radeon HD 6990M Crossfire is manufactured by 40 nm process technology, and Radeon R9 M270X - by 28 nm process technology.
    • Memory clock speed of Radeon R9 M270X is 225 MHz higher, than Radeon HD 6990M Crossfire.

    Game benchmarks

    high / 1080p 35−40 6−7
    ultra / 1080p 21−24 4−5
    QHD / 1440p 16−18 0−1
    4K / 2160p 10−11 −
    low / 720p 60−65 16−18
    medium / 1080p 40−45 8−9
    The average gaming FPS of Radeon HD 6990M Crossfire in Assassin's Creed Odyssey is 355% more, than Radeon R9 M270X.

    Full Specs

      Radeon HD 6990M Crossfire Radeon R9 M270X
    Architecture Terascale 2 GCN 1.0
    Code name Blackcomb XTX Venus
    Type Laptop Desktop
    Release date 12 July 2011 21 March 2014
    Pipelines 2240 640
    Core clock speed 715 MHz 725 MHz
    Boost Clock 775 MHz
    Transistor count 2x1700 Million 1,500 million
    Manufacturing process technology 40 nm 28 nm
    Texture fill rate 31.00
    Floating-point performance 1,536 gflops
    Memory bus width 256 Bit 128 Bit
    Memory clock speed 900 MHz 1125 MHz
    Memory bandwidth 72 GB/s
    Shared memory -
    DirectX DirectX 11, Shader 5.0
    Shader Model 5.1
    OpenGL 4.4
    OpenCL Not Listed
    FreeSync +
    Bus support PCIe 3.0 x16
    Laptop size large
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
    Compute units 10
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