AMD Radeon 625 vs AMD Radeon RX 640
AMD Radeon 625► remove
The Radeon 620 is a dedicated entry-level graphics card for laptops that was released in 2019. According to AMD, the GPU offers 6 compute units (CUs = 384 shaders) and 4 GB GDDR5 (64 bit bus) graphics memory (max). The chip is most likely not based on the current Navi or even older Polaris architecture, but still based on the the old Mars chip from the Radeon HD 8590M / M260 / M340 / M440 and Radeon 530.
Therefore, the gaming performance is positioned in the absolute entry level (see the similar Radeon 530). Only a few modern games like Dirt Rally 2.0 should run fluently in low settings.
AMD Radeon RX 640► remove
The AMD Radeon RX 640 is mobile mid-range graphics card for laptops based on the Polaris architecture. It features 640 shaders (10 CUs) or 512 shaders (8 CUs) with different clock speeds. Compared to the older RX 550(X), the RX 640 seems to offer only half of the memory bandwidth (64 Bit memory bus instead of 128 Bit).
|AMD Radeon 625||AMD Radeon RX 640|
|Radeon 600 Series|
|384 -||640 -|
|Core||1024 (Boost) MHz||1287 (Boost) MHz|
|Memory||2250 MHz||7000 MHz|
|Bus||64 Bit||64 Bit|
|Max. Memory||4096 MB||4096 MB|
|DirectX||DirectX 12, 5.0||DirectX 12|
|Technology||28 nm||14 nm|
|Features||DirectX 12, Mantle, OpenGL, OpenCL 1.2, Vulkan||DisplayPort 1.3 HBR / 1.4 HDR Ready, HDMI 2.0, AMD FreeSync|