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    GeForce GT 645M vs Radeon HD 7870 XT

    Find out if it is worth upgrading your current GPU setup by comparing GeForce GT 645M and Radeon HD 7870 XT. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce GT 645M and Radeon HD 7870 XT. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.
    GeForce GT 645M Check Price
    Radeon HD 7870 XT

    GeForce GT 645M is a Laptop Graphics Card

    Note: GeForce GT 645M 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 GeForce GT 645M here:

    GeForce GT 645M Laptops

    Main Specs

      GeForce GT 645M Radeon HD 7870 XT
    Power consumption (TDP) 32 Watt 185 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x16
    Supplementary power connectors 2x 6-pin
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 2 GB
    Display Connectors No outputs 1x DVI, 1x HDMI, 2x mini-DisplayPort
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    • Radeon HD 7870 XT has 478% more power consumption, than GeForce GT 645M.
    • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
    • GeForce GT 645M and Radeon HD 7870 XT have maximum RAM of 2 GB.
    • GeForce GT 645M is used in Laptops, and Radeon HD 7870 XT - in Desktops.
    • GeForce GT 645M is build with Kepler architecture, and Radeon HD 7870 XT - with GCN 1.0.
    • GeForce GT 645M and Radeon HD 7870 XT are manufactured by 28 nm process technology.
    • Memory clock speed of Radeon HD 7870 XT is 4200 MHz higher, than GeForce GT 645M.

    Game benchmarks

    high / 1080p 1−2 35−40
    ultra / 1080p 0−1 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 12−14 60−65
    medium / 1080p 2−3 40−45
    The average gaming FPS of Radeon HD 7870 XT in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M Radeon HD 7870 XT
    Architecture Kepler GCN 1.0
    Code name N13P-GS Tahiti
    Type Laptop Desktop
    Release date 22 March 2012 19 November 2012
    Pipelines 384 1536
    Core clock speed 925 MHz
    Boost Clock 975 MHz
    Transistor count 1,270 million 4,313 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 93.60
    Floating-point performance 544.5 gflops 2,995 gflops
    Length 267 mm
    Memory bus width 128bit 256 Bit
    Memory clock speed 1800 MHz 6000 MHz
    Memory bandwidth 192.0 GB/s
    Shared memory -
    DirectX 12 API 12 (11_1)
    Shader Model 5.1 5.1
    OpenGL 4.5 4.6
    OpenCL 1.1 1.2
    Vulkan 1.1.126 1.2.131
    CUDA +
    CUDA cores 384
    Bus support PCI Express 2.0, PCI Express 3.0
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 19 Mh/s 346 Mh/s
    Laptop size medium sized
    Optimus +
    Ethereum / ETH (DaggerHashimoto) 14.5 Mh/s
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