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    Radeon HD 7990 vs Radeon R7 M340

    When choosing between Radeon HD 7990 and Radeon R7 M340, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between Radeon HD 7990 and Radeon R7 M340.
    Radeon HD 7990 Check Price
    Radeon R7 M340 Check Price

    Radeon R7 M340 is a Laptop Graphics Card

    Note: Radeon R7 M340 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 R7 M340 here:

    Radeon R7 M340 Laptops

    Main Specs

      Radeon HD 7990 Radeon R7 M340
    Power consumption (TDP) 375 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x8
    Supplementary power connectors 2x 8-pin None
    Memory type GDDR5 DDR3
    Maximum RAM amount 3 GB 4 GB
    Display Connectors 1x DVI, 4x mini-DisplayPort No outputs
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    • Radeon HD 7990 is connected by PCIe 3.0 x16, and Radeon R7 M340 uses PCIe 3.0 x8 interface.
    • Radeon R7 M340 has 1 GB more memory, than Radeon HD 7990.
    • Radeon HD 7990 is used in Desktops, and Radeon R7 M340 - in Laptops.
    • Radeon HD 7990 is build with GCN 1.0 architecture, and Radeon R7 M340 - with GCN.
    • Core clock speed of Radeon R7 M340 is 71 MHz higher, than Radeon HD 7990.
    • Radeon HD 7990 and Radeon R7 M340 are manufactured by 28 nm process technology.
    • Memory clock speed of Radeon HD 7990 is 5000 MHz higher, than Radeon R7 M340.

    Game benchmarks

    high / 1080p 35−40 0−1
    ultra / 1080p 21−24 −
    QHD / 1440p 16−18 0−1
    4K / 2160p 10−11 −
    low / 720p 60−65 1−2
    medium / 1080p 40−45 0−1
    The average gaming FPS of Radeon HD 7990 in Assassin's Creed Odyssey is 6100% more, than Radeon R7 M340.

    Full Specs

      Radeon HD 7990 Radeon R7 M340
    Architecture GCN 1.0 GCN
    Code name Malta Meso Pro DDR3
    Type Desktop Laptop
    Release date 24 April 2013 16 June 2015
    Pipelines 2048 320
    Core clock speed 950 MHz 1021 MHz
    Boost Clock 1000 MHz 1021 MHz
    Transistor count 4,313 million 950 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 128.0 17.16
    Floating-point performance 2x 4,096 gflops 549.1 gflops
    Length 307 mm
    Memory bus width 384 Bit 128 Bit
    Memory clock speed 6000 MHz 1000 MHz
    Memory bandwidth 288.0 GB/s 16 GB/s
    Shared memory -
    DirectX 12 (11_1)
    Shader Model 5.1 5.1
    OpenGL 4.6 4.4
    OpenCL 1.2 Not Listed
    Vulkan 1.2.131 +
    FreeSync +
    Bus support PCIe 3.0
    Bitcoin / BTC (SHA256) 459 Mh/s 74 Mh/s
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
    Ethereum / ETH (DaggerHashimoto) 44 Mh/s
    Compute units 6
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