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    Mobility Radeon HD 4870 vs Radeon RX 640

    If you are going to buy a new graphics card and are choosing between Mobility Radeon HD 4870 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 Mobility Radeon HD 4870 stacks up against Radeon RX 640, check out specs charts below.
    Mobility Radeon HD 4870 Check Price
    Radeon RX 640 Check Price

    Mobility Radeon HD 4870 and Radeon RX 640 are Laptop Graphics Cards

    Note: Mobility Radeon HD 4870 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 Mobility Radeon HD 4870 or Radeon RX 640 here:

    Mobility Radeon HD 4870 Laptops
    Radeon RX 640 Laptops

    Main Specs

      Mobility Radeon HD 4870 Radeon RX 640
    Power consumption (TDP) 50 Watt
    Interface PCIe 2.0 x16 PCIe 3.0 x8
    Supplementary power connectors None
    Memory type GDDR5 GDDR5
    Maximum RAM amount 1 GB 4 GB
    Display Connectors No outputs 1x DVI, 1x HDMI, 1x DisplayPort
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    • Mobility Radeon HD 4870 is connected by PCIe 2.0 x16, and Radeon RX 640 uses PCIe 3.0 x8 interface.
    • Radeon RX 640 has 3 GB more memory, than Mobility Radeon HD 4870.
    • Both cards are used in Laptops.
    • Mobility Radeon HD 4870 is build with Terascale 1 architecture, and Radeon RX 640 - with Polaris.
    • Core clock speed of Radeon RX 640 is 668 MHz higher, than Mobility Radeon HD 4870.
    • Mobility Radeon HD 4870 is manufactured by 55 nm process technology, and Radeon RX 640 - by 14 nm process technology.
    • Memory clock speed of Radeon RX 640 is 5112 MHz higher, than Mobility Radeon HD 4870.

    Game benchmarks

    high / 1080p 7−8 5−6
    ultra / 1080p 4−5 3−4
    QHD / 1440p 0−1 2−3
    low / 720p 16−18 16−18
    medium / 1080p 8−9 7−8
    The average gaming FPS of Mobility Radeon HD 4870 in Assassin's Creed Odyssey is 12% more, than Radeon RX 640.

    Full Specs

      Mobility Radeon HD 4870 Radeon RX 640
    Architecture Terascale 1 Polaris
    Code name M98-XT Polaris 12
    Type Laptop Laptop
    Release date 9 January 2009 12 August 2019
    Pipelines 800 640
    Core clock speed 550 MHz 1218 MHz
    Boost Clock 1218 MHz
    Transistor count 956 million 2,200 million
    Manufacturing process technology 55 nm 14 nm
    Texture fill rate 22.00 38.98
    Floating-point performance 880.0 gflops
    Memory bus width 256 Bit 64 Bit
    Memory clock speed 888 MHz 6000 MHz
    Memory bandwidth 56.83 GB/s 112.0 GB/s
    Shared memory - -
    DirectX 10.1 (10_1) 12 (12_0)
    Shader Model 4.1 6.4
    OpenGL 3.3 4.6
    OpenCL 1.1 2.0
    Vulkan N/A 1.2.131
    FreeSync +
    Laptop size large large
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