Radeon R7 M340 vs Radeon R9 M390X

In this comparison between Radeon R7 M340 and Radeon R9 M390X you will find out which graphics card performs better in today's games. Bear in mind that third-party versions may have more efficient cooling and higher clock speeds. This will increase cards' performance, though not by much. In addition to raw power you should also take into account the dimensions. Thicker models simply will not fit into a small mini-ITX case. The resolution of your monitor also affects the choice, since 4K gameplay requires a more powerful GPU. And don't overspend on the graphics card. Other parts of your build may also need to be upgraded, save some money for the CPU or power supply. For some people Radeon R7 M340 will be the best choice, for others Radeon R9 M390X will be their preference. Study the comparison tables below and make your choice.

Radeon R7 M340 and Radeon R9 M390X are Laptop Graphics Cards

Note: Radeon R7 M340 and Radeon R9 M390X 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 Radeon R7 M340 or Radeon R9 M390X here:

Main Specs

  Radeon R7 M340 Radeon R9 M390X
Power consumption (TDP) 100 Watt
Interface PCIe 3.0 x8 PCIe 3.0 x16
Supplementary power connectors None None
Memory type DDR3 GDDR5
Maximum RAM amount 4 GB 4 GB
Display Connectors No outputs No outputs
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  • Radeon R7 M340 is connected by PCIe 3.0 x8, and Radeon R9 M390X uses PCIe 3.0 x16 interface.
  • Radeon R7 M340 and Radeon R9 M390X have maximum RAM of 4 GB.
  • Both cards are used in Laptops.
  • Radeon R7 M340 is build with GCN architecture, and Radeon R9 M390X - with GCN 3.
  • Core clock speed of Radeon R7 M340 is 298 MHz higher, than Radeon R9 M390X.
  • Radeon R7 M340 and Radeon R9 M390X are manufactured by 28 nm process technology.

Game benchmarks

high / 1080p 0−1 21−24
ultra / 1080p 12−14
QHD / 1440p 0−1 8−9
4K / 2160p 5−6
low / 720p 1−2 40−45
medium / 1080p 0−1 27−30
The average gaming FPS of Radeon R9 M390X in Assassin's Creed Odyssey is 4100% more, than Radeon R7 M340.

Full Specs

  Radeon R7 M340 Radeon R9 M390X
Architecture GCN GCN 3
Code name Meso Pro DDR3 Amethyst (XT) / Tonga
Type Laptop Laptop
Release date 16 June 2015 9 June 2015
Pipelines 320 2048
Core clock speed 1021 MHz 723 MHz
Boost Clock 1021 MHz
Transistor count 950 million 5,000 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 17.16 92.54
Floating-point performance 549.1 gflops 2,961 gflops
Memory bus width 128 Bit 256 Bit
Memory clock speed 1000 MHz
Memory bandwidth 16 GB/s 160.0 GB/s
Shared memory - -
Shader Model 5.1 6.3
OpenGL 4.4 4.4
OpenCL Not Listed Not Listed
Vulkan + +
FreeSync + +
Bus support PCIe 3.0 PCIe 3.0
Bitcoin / BTC (SHA256) 74 Mh/s
Laptop size large
Eyefinity + +
HD3D + +
PowerTune + +
DualGraphics + +
ZeroCore + +
Switchable graphics + +
Mantle + +
Compute units 6
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